R.I.P. Jenny 20% Jenny Coming! Flown Today! 9-20-08

[LBJ]

I have one of the 20% Jenny's coming from CA. Going to make it electric. Should be lots of fun. 105" Span, 20 pounds. ARF. From Maxford USA. The motor and speed controller is about $275 with shipping. So, much cheaper than AXI. Model should actually be less than 20 pounds, but that's what they rate the gas powered version.
http://img.photobucket.com/albums/v228/numskin/Big_Jenny.jpg

Motor Specs:
Model: HXT80-85-B
Input Voltage : max. 48V
Kv : 170 rpm/V
Weight: 1230g
Shaft: 10mm
Voltage Range: 20-48v
Non Load Current: 2.6A
Stator Size: 70x40mm
Power: 6000W
Turns: 8
Resistance: 37ohm
Idle Current: 2.6A
Equivalent: 50-70cc Gas Engine

http://img.photobucket.com/albums/v228/numskin/C80-85-A.jpg

[blucor basher]

This may be out of character for me, but that is so cool. Where'd you get it from? Netbox or factory direct?

[LBJ]

blucor,

Yes, from the distributor/importer in CA. On sale for $602 with free shipping.

[LBJ]

Yes, it's going to be BIG!!! Everything was well packed and double boxed. Included a DVD instruction video, but no sound. Pretty self explanatory though. Be a week or two before I start on it. Got another project ahead of it. I'd like to fly it sometime this fall when it gets a bit cooler. I am slower than Christmas putting these things together.

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[jrb]

Cool!

What do you plan for batts?

[LBJ]

Gonna go with Common Sense Lipos. Run 12 cells with a 22x10 prop. Might run on less, but that's a likely combination, according to Ed Couch who is helping me get the right gear together. We have been doing great with C.S. 10C battery packs with all of our sport flying. So, figure it will be fine on the Jenny. Ed said the motor came in today and the speed controller is on its way. $$$$$$$$

[jrb]

Have you considered A123s?

[LBJ]

No, I have a fair supply of Lipo's including at least one set of C.S. 4S batts. Plus, all my other planes are running on Lipo's.

[jrb]

Sounds good!

Gotta a link to the Jenny?

[NumbSkull]

That one HUGE Jenny!!!!

Looks like a fun project!!

[jrb]

http://www.maxfordusa.com/gm-jenny-105-soild.aspx

[mexico]

105" is only 20%? The full scale is 525" ? That is one large plane.

How complicated is the wing assembly/struts/braces to get it all together each time you fly?

[appleflyer]

cant you get this plane at Atlanta hobby?

[LBJ]

Mexico,

Best I can tell so far, each complete upper/lower wing half should come off clean at the center section with just unhooking the aileron wires. Still, the length of the fuselage is the transport problem. I'd have to look up the Jenny full size to see the wing span. That works out to 43 feet. Sounds a bit large, but maybe.

appleflyer,

I got this over the internet from the importer/distributor with free shipping. Don't know about that outlet.

[LBJ]

You'll get a kick out of this. That's an E-Flight 46 next to the Jenny motor! That's not trick photography. Shafts are touching.

http://img.photobucket.com/albums/v228/numskin/IMG_0324.jpg

[atlav8r]

cant you get this plane at Atlanta hobby?

Yes this aircraft was orig built for us and I have been flying mine for 3 years now.
It is very nice and flys like a pussycat. Have showcased it at SEFF for the past 2 years now.
Cliff

[LBJ]

Finally got started on the Jenny. I pulled the motor box out and began first to modify to accept the mount hardward for the beast motor. The box has down and right thrust built in, so, all I had to do was to center the aluminum mount over the marked spot and move the T-nuts to be there. Then, it's just a matter of sliding the box in and finding the correct distance in/out to receive the cowl. That's the motor box to the right in the first photo. Not sure yet what position the cowl is supposed to be in as far as fore/aft. I will study some shots of the prototype to go by. This model has a DVD assembly guide vs a paper manual. I think it will be enough to get 'er done. So far so good.

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[GunnyGlow]

very nice.....looking forward to the finished product!!!

[vonJaerschky]

Awesome Jenny. But what everybody really wants to know is - Who's that on the Cub? :)

[LBJ]

I'd like to say that's my girlfriend, but that would be a fantasy answer! <grin> Let's just call her pic a little inspiration. LBJ

[GunnyGlow]

I'd like to say that's my girlfriend, but that would be a fantasy answer! <grin> Let's just call her pic a little inspiration. LBJ

Sounds like a REALLY bad combo...ya know, with all that CA sitting around. :)

[LBJ]

This is the first choice in setting up the batteries and speed controller. The second choice would be to also have the batteries under the cowl, but that's a lot of extra work to set up. I'd have to cut the cowl and make it hinged. With this setup, the batteries are just about on the CG, which could be good or bad, depending on how it balances out. That's a quarter scale pilot which seems to be about right. I'd rather have a pilot a lot too big too big than any too small. Those a re Common Sense 4S packs at 3850 mah. 10C rating. The first set of 2 packs is from my Quarter Scale Cub which runs an E-Flight 110. All three packs will give about 44 - 48 volts. That's a 100 amp SC.


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[thunder1]

Beautiful model!

With that long of a fuselage, I can only imagine you're going to need a bunch of weight in the nose to balance.

I'd cut the upper section of the cowl at the line and just make the whole thing removable. Attach with screws at the corners.

[LBJ]

I'm starting to think the same way, Thunder 1. If it is too easy, there must be a problem down the road like too tail heavy! I am most likley going to cut the cowl and rig it to attach somehow that will still look good and be sturdy at the same time. It's going to need some nose weight and it might as well be batteries. LBJ

[LBJ]

After a bit of hinging yesterday with 30 minute epoxy, got the tail feathers installed tonite. I must say that the hinge holes were all predrilled and lined up to put the parts in the proper alignment with the horizontal and vertical. Prefitting is recommend because there seems to be a left and right elevator, even though there doesn't need to be, just they way they were set up. I first installed the support flying wires on the elevators and rudder and then bolted both assemblies on. Had to cut away a bit of material where the rudder bumps up against the horizontal area shown in the last pic as it hindered full swing of the rudder which is going to be pretty important for this model. I have almost elevator-to-elevator travel. Recovered the small area with some scrap covering they supplied. When fitting the rudder and vertical, the bolt holes for the vertical support did not line up below the horizontal, so I enlarged them with a Dremel tool small sanding drum and they bolted right up. That's about the worst thing I have encountered so far on this model, which really ain't much at all. This is a well engineered and thought out model. I do miss not having a paper-copy instruction manual though. Even the video is without narration. If I had to downgrade anything, that would be the area. But, they say that this is not a beginner's model and I am not a beginner. So, it's working well.

Got all the tailfeathers hooked up including the tailwheel. Yes, the full scale bird did not have one, but on a model this size, it makes sense. Launching from the grass, it will actually look like a skid! I added two wires for holding the vertical steady since it moved every time the rudder is actuated. I felt that after a while, the vertical might just snap off from fatigue. The added wires look pretty scale as I even used turnbuckles. Next, the cowl gets modded.

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[jrb]

Could you name and post a link to the place tha has the motor & ESC?

[Ed Couch]

Motor and ESC came from United Hobbies, Hong Kong. At the following site: https://www.unitedhobbies.com/UNITEDHOBBIES/store/uh_index.asp

Only advice is never backorder anything and use the 3 to 5 day express mail. It works and I have never had any problems. You are working in Kilogram size orders and the cart will count down how much each item you want weighs. There are many little items that can be added to the order that cost very little to fill the order do so. In the long run it saves you quite a bit of money. The motors have proved excellent value at this time but take it with a grain of salt as some people would not be satisfied if it was diamond coated. ed

[LBJ]

Took Ed Couch's advice on how to cut the hatch. Take some tape and mask off EXACTLY where you want to cut. Then, take a brand new razor saw and take your time and cut the line. It works, I have to say. Moving the batts up front improved the CG immensely. That was the hardest part of this project. I feel I can sail thru the rest. I have some "lips" to creat for the hatch to rest in and need a couple of screws soemwhere along the way to hold it in place. Maybe the new wave - magnets? Or, hinge one side and let it fold over? Hmmmm, have to think about that.

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[LBJ]

I added some reinforcement to the upper cowl to make it easier to put back on after battery change. I'll cut the panels out on the black lines to allow the cooling air to pass thru. Need to decide to hinge it or just screw it on.

http://img.photobucket.com/albums/v228/numskin/IMG_0400.jpg

[LBJ]

Done with the hatch. I trapped it at the front and sides and only have two screws holding it in at the rear. Simple enough. On to installing the battery hold down setup, speed control, locking down the motor mount tube and running the thing up! Should be interesting. I still need to get a big azz prop though. 22 incher. Hehehehehe

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[LBJ]

Here she is on 8 cells and an 18x10 prop off the Cub. Would fly with this setup, I am sure. 12 S and 20x10 prop will really buzz. You can see the final position of the SC and the batteries. Of course, there will be another 4S pack in there. The receiver will probably go down below with the other servos. The cowl never gave a peep even at full tilt. Should be a pretty smooth plane.

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[Pistolera]

Looks fanastic LBJ!!!!!!! Outta be a real hoot to fly :)

Years ago leaving an airshow in College Park, MD I "tried" to fly in formation with Ken Hyde in his restored Jenny (Warrenton, VA). I had my Pitts hanging on the prop for all she was worth but I still passed him. :eek:

Earle

[LBJ]

If you just do SOMETHING every day, it will get done. Doesn't have to be a lot, just something. I added the switch harness and the windscreens this afternoon after work. Last nite, I added the fairings on the LG and got the pilot situated with some styro to give him a bit of a boost in the seat and some velcro to hold him in on those big loops. You know, they didn't have seat belts back in those days! I also soldered the wheel collars on. For a model this large, you could get some pretty big side loads on that collar. So, I don't want them coming off. I am about out of fuselage work. Next, the upper wings halves and ailerons. A bit of work, but not too difficult. I expect that doing the main rigging will be the hardest part.

http://img.photobucket.com/albums/v228/numskin/IMG_0422.jpg

[Amp Abuser]

Shaweet look forward to some vid of this beast taking off. = )

[staggerwing]

Very nice !
Just want to mention I've had great luck using these large HXT out runners & sentilon ESC's in giant scale models. I have same in a 22lb 96" Rearwin Speedster on 8s w/ a 22 X 12 wide blade APCE which I accidentally stalled on a strong cross wind take off so it was momentarily hovering about 4' above the runway---do I try to recover or suffer some damage ?---gave it WOT & it sucked up out of the stall as I & onlookers stood in amazement ! For sport flying, it is bewildering why some pay 2 to 3X more bucks for mtrs & ESC's.
I would suggest high voltage is not needed for a large prop floater application as it tests the limits of these motors & ESC's . The Rearwin will do all basic aerobatics on 8s.
I haven't seen any mention of weight in your posts ?
Also am curious about field set up time as in my 55 yrs or so of RC, I've had many large bipes w/ flying wires (try a Proctor) & it can be enough for me to hesitate owning another.
Great pics & good luck !

[LBJ]

Staggerwing, the projected weight is 20 lbs from the maker. However, all of my electrics have been a pound or two lighter than the gas powered weights. I expect this to be no different.

The wings should come off as a left and right set, top and bottom, flying wires included. The real problem is getting it to and from the field. I am going to use my 77 Chevy PU to transport. It has the 8 foot bed. I am buying a rubber bed liner to keep things from slipping around and will use a 25 lb plate to anchor the front down with. Something on the tail end as well. Hopefully the wings will go inside the cab. At least one set will, don't know if both will fit. Might have two vehicles do the job.

It should be fun to fly regardless of how I get it to the F.F.

When I ran it up on 8 cells, it seemed enough to do the job with an 18 inch prop.

Won't be long at this point. It would be nice to get it out to the local warbird fly in on Sept 20th.

[LBJ]

Got a bit more done last nite and tonite. I need to add the struts and then I will be ready to run the rigging over around and thru the wings. I could use a bigger work area! Starting to shape up now.

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[AirNerd]

That is just plane awsome.

The motor is HUGE!!! but the plane makes it look small, thats funny.

I really hope to see this fly...any chance of a vid?

You really DO need a larger work area LOL.

[LBJ]

Airnerd,

I may buy a camera just to document this one! Someone may show up with one on whatever day we fly it. Hard to say. but I will get some still pics. It will be a few weeks out, still. I have some work to do on the truck bed to get it ready to haul it around.

[AirNerd]

Great!

If you just get stills..try to get some good perspective shot to show the giantness.

Cant wait, Chris

[atlav8r]

Here are a few size comps for you of the one I have been flying 2+ years now

[atlav8r]

Click to see video (http://www.youtube.com/watch?v=LQkGkjGFqG8)

I have some other ones from SEFF of it doing loops, rolls and a cool knife edge pass but will have to find them.

[AirNerd]

Thank you!

It dose seem like it should make some more noise...mabey a speaker setup??? It just needs some rumble.

Very impresive electric though!

Thanks again, Chris

[LBJ]

Atlv8r,

How much lead or weight did you add to the nose? I feel I need at least a pound based on the CG I ran so far. It is about neutral without any extra weight, but I like at least some nose-down to start with. Maybe two pounds to get there. I see your batts are all the way forward, so maybe you didn't have to add anything. Any other info to pass on before the first flight? Thanks, LBJ

Good looking flight by the way. Thanks for adding the video.

[atlav8r]

We actually made a new motor box (made it longer) and moved the motor and packs way forward. Even with this I have 2 pounds on top of the motor box. I have the packs inside the motor box 2 5S 6000 Mah Packs.

[LBJ]

I got hold of a 1.5 pound dive belt weight and added it to the firewall below the engine box. That should be a good start. I may get it airborne this weekend if I can get the wings in the truck bed too. Everything is looking pretty good. I will give a report if we get it airborne.

[atlav8r]

I got hold of a 1.5 pound dive belt weight and added it to the firewall below the engine box. That should be a good start. I may get it airborne this weekend if I can get the wings in the truck bed too. Everything is looking pretty good. I will give a report if we get it airborne.

You will have a good time with it. It flys like a big box kite... a real pussycat and great to watch and hear on low slow passes.

Cliff Whitney
Atlantahobby.com

[LBJ]

We flew it today at a War Bird Meet at the local club field. All I can say is it flew great. We could not have had a better morning to fly a new aircraft. Ed Couch flew it 4 times at I took a turn at the controls myself. We got 5 flights in all. Really smooth and effortless. Had plenty of power but we were underpropped, which really got the batts hot. We used a 20x8-14 and it needs a 22x10 next time I go to the hobby store. I wanted Ed to start with a taxi test which actually got airborne a few inches for a short hop. Brought it back in and rechecked everything and took it out and Ed took off for the first real flight. I cannot think of anything it needs other than the prop. It won the vote of "Pilot's Choice" which was the only vote or prize given. I am truly pleased to get that award because there were some other nice warbirds out there. If I can get some of the pics by a lady who had a real pro camera with big lens, I will post a few of those. The last couple of shots are of Ed Couch and how I got it to the field. It rode just fine in the PU with that spiderweb net - at 55 mph max. The wings had some huge bath towels to cover the flying wires and a 25 pound weight held the fuselage down. Thanks to Ed Couch for his skilled fingertips at the controls and thanks to Atlav8r for the advice.

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[Ed Couch]

The Boy needs to spend more time taking pictures of the airplane instead of the old stick (me). It was a pleasure to be given the go for the first flight and it was a kick to make it go. Aircraft flew like a dream, control harmony on all axis was great. Aircraft went where you pointed it and the controls inputs were very solid. I looped her several times after a shallow dive and once on her back pulled the power to coast down the backside. Reapplied power and continued the flight. Chandelles were very easy, again out of the shallow dive to build speed prior to entering the maneuver. Rolls took a little more work and they were large barrel type as this bird ain't going to do an axle roll for no one. A work of art in the air and honestly electric is the only way to go. Airborne time was over eight minutes for each flight with reserve in case of problems which never occurred. One sweet vehicle and a pleasure. ed

[atlav8r]

Congrats guys, Well done!
I knew you would love her.

Cliff Whitney
Atlantahobby.com

[AirNerd]

Awsome.

[gp125racer]

Beautiful plane, and congrats on the successful maiden!

Don

[Ed Couch]

Folks

Here is a link to our local Club. We had a War Bird meet last Saturday where the Jenny made her initial flights. Twenty plus pilots and about 40 warbirds flown. There are a number of photos of the Jenny as well as my P6-E Hawk and KI-61 plus Lane's Mig and F-5. Needless to say it was a great turnout for a club event. All had a great time and only one vehicle was lost. ed

http://www.flygsw.org/gallery2/main.php?g2_itemId=139260

[LBJ]

This pic was taken by a lady by the name of Nancy. I do not have her last name, but she took some great photos. I will have this one framed and use it for a screen saver at work! From the same group that Ed Couch just listed by the link.

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[BrentP]

She's a beauty guys, nice pics. LBJ about how long does it take to assemble at the field?
I think Nancy's last name is Abby, according to ED's previous link.

[steve1814]

I have some other ones from SEFF of it doing loops, rolls and a cool knife edge pass but will have to find them.

Cliff, Where did you get your pilot - I love the swiveling head

--I just broke down and purchased one. I guess I'll be the first to run A123's. With all the weight you guys are adding - A123's seem like a good choice. I'll either run 10S or 12S depending on the weight.

Cheers,
Steve

[LBJ]

Here's how the wings plug in. Pretty simple, huh? Takes about 15 minutes to put together. There are aluminum wing spars that plug into the upper and lower wing. Makes setting up pretty easy even for one person if need be. Four bolts hold the wings on on the bottom uder the LG. That's it.

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[BrentP]

That looks like a Great Planes 1/5 scale pilot. I have the same in my Fokker Dr1. How did you do the head turn Cliff? Is it a seperate servo? linked to rudder?
Cool touch :cool:

[steve1814]

LBJ,

Did you ever try out that 22 X 10 prop? I am about to order the prop for mine and was just wondering if you liked the 22" better. I also am going to try the Xoar wooden electric - I here that it is recommended that you go up one size with these, so if I get the 22" I may be only propped for 21". I have one on my 1/5 scale cub and use a 14 x 7, pulls about 700W/47 amps WOT on a power 46 with 5S2P A123's...

Cheers,
Steve

[LBJ]

No as a matter of fact I just got the 22x8 on Sunday from Ed Couch. He picked a wooden Scimitar prop up over on a trip to a Dallas hobby shop recently, which should not only work well, but fit the style of the Jenny. Ed thinks it will work nicely. I won't take the Jenny out again till Nov 1 at a local electric meet. It's kind of a special bird and I don't want to haul it out every weekend. But, I am looking forward to testing the new prop too. Windsor Propellors made this one. Good luck on your Jenny!

[steve1814]

LBJ, Thanks for the info.

Motorcalc was all over the place with this bird for measurements. It had me down to 8S2P (a123) with a 20X8 APC E doing torque rolls and Hovering:rolleyes: Obviously I got some part of the airframe wrong - says the wing loading was a max of 10 oz with 12S2P (a123) and a AUW of 23 lbs.:rolleyes::rolleyes: I figure I'll just start off with a 20X10 on 10 cells and see what happens...I did go with the same motor as you have (almost go the 80-100 - but talk about overkill:p)

My Jenny is supposed to arrive on Wednesday and the Motor on Friday. -the rest of the stuff I already have. If the weather holds I have a Sig Tri-star with contra roating props to maiden this weekend, but I'll be building the Jenny as time permits.

Cheers!

Steve

[Ercoupe Ed]

Really nice airplane LBJ !
Absolutely gorgeous!
One of my favorites!
Where did you get the kit?
I have to have one!!!

Ed

[BrentP]

Really nice airplane LBJ !
Absolutely gorgeous!
One of my favorites!
Where did you get the kit?
I have to have one!!!

Ed
Not to jump in for LBJ but MAXFORD USA is where I think LBJ got it from. POWERLINE HOBBIES also has the same GREEN RC MODELS kit.
I have (POWERLINE HOBBIES) a DR1 and Camel both GREEN RC MODELS. I like GRCM planes alot.

[steve1814]

Got mine in today! everything looked great, except for one thing (can you guess what that may be?) I'll have to contact Maxford and see if I can get that fixed

Cheers:)
Steve

[atlav8r]

Got mine in today! everything looked great, except for one thing (can you guess what that may be?) I'll have to contact Maxford and see if I can get that fixed

Cheers:)
Steve
We have a bunch of these in stock and it looks like you are missing the second box ;-)

Does your tracking # say box 1 of 2?

[steve1814]

We have a bunch of these in stock and it looks like you are missing the second box ;-)

Does your tracking # say box 1 of 2?

Oh, I have the second box and everything seems to be in great shape, the problem is evident in the fuselage picture itself....

Cheers,
Steve

[Tim Wolff]

Just fly it inverted alot :)

[steve1814]

Just fly it inverted alot :)


<chuckle>..If it said "The Great Waldo Pepper" on the side like that I certainly would!:D

Just a quick plug: Richard Sang from Maxford USA responded to my email about 5 minutes after I sent it taking care of the issue. I know it is nothing big, but when they care enough to make sure you're happy no matter how small, that's great customer service in my book. Kudos!

Cheers,
Steve

[LBJ]

Steve,

That's just sick! Are they going to send out a new fuselage? Glad they are taking care of you.

LBJ

[steve1814]

Steve,

That's just sick! Are they going to send out a new fuselage? Glad they are taking care of you.

LBJ

The fuselage is fine, I just need the correct "Kelly Field" stickers. I won't let the lack of them stop me from building, so as soon as I get the Storch finished...
The new decals have to come from the factory, so I am guessing it will be a few days:rolleyes:

After getting Motorcalc straight, 12S2P A123's are going to be my fuel source. A 22 X 14 Xoar PJN-E F3A prop looks like the ticket @ 87 w/lb, but they are not available yet. I got a couple of 22 X 10 APC-E's comping in that should do nicely in the meantime...

Cheers,
Steve

[steve1814]

LBJ,

How many times did you have to watch the video to get the "threading" of the wires correct? I just watched the video for the first time - Think I'll need to pause || rewind <<- and play > quite a few times to get it correct.

doing some trial fittings - things seem to fit good. All parts and pieces accounted for.

I have some Hitec 635BB's that will work nicely in this bird. Tomorrow the motor should be in, so I can play with it's fitting. I'll probably have to build the entire plane before I can figure out how I want the batteries. I am going to leave them in place for charging, so getting at them isn't critical, but I will need to get them out eventually, so putting them behind the motor is probably out of the question. I'll be using 4 FMA Balance Pro HD's to do the charging (40 AMPS!) on 4 6S1P packs, so I figure two on the sides, two on the top and the ESC underneath. The C/G will determine the RX pack location.


http://www.bentprop.net/RC%20folder/Giant%20Jenny/IMG_1394_copy%281%29.JPG

Cheers,
Steve

[steve1814]

The power plant came in today...looks like HXT has been turned into a Turnigy brand now...

http://www.bentprop.net/RC%20folder/Giant%20Jenny/IMG_1397_copy%281%29.JPG

Hope it runs the same...

Cheers,
Steve

[BrentP]

No problems with the Turnigy outrunner in my dr1 after 30 flights. Just got a Turnigy inrunner for a EDF, hoping it's goning to perform as well.

[LBJ]

Steve, I watched the video MANY times before I finally took a sheet of paper and drew a rough sketch of the setup and started numbering the points. I seem to recall that there are 16 points to thread thru and finish. That's about the only way to do it.

The batts are going to need to be all the way up front for the needed CG. I added 1.5 lbs to 3, 4-packs of 3850 Lipo's plus the flight pack of 3200 mah NIMH 4.8 volts.

So, it's your choice how you mount them but I would rather have as little lead in the nose as possible.

It's going to be fun!

[steve1814]

Not a whole heck of a lot of work done, but progress is progress. After getting the vert stab bolted down, I am with LBJ on the additional wires., I'll be adding them to mine as well. I also didn't like the lack of a pin hinge on the lower portion of the rudder, especially since the tail wheel is connected there. I'll be adding a modified pin hinge (one that will still allow me to remove the epannage) before I glue all the control surfaces in place.

http://www.bentprop.net/RC%20folder/Giant%20Jenny/IMG_1402_copy%281%29.JPG

Cheers,
Steve

[LBJ]

Steve, lookin' good! Just five minutes a day will get you there. Keep at it.

[steve1814]

I was cleaning up the workshop/garage yesterday and need a place to store the Jenny so I could clean off the workbenches...I figured it was a good time to see if transporting the plane to the field was going to require my trailer (flatbed). It was nice to find out that the plane does fit in the back of my Montero. I won't be taking the usual 3-4 planes with me when I fly the Jenny, but at least I'll be able to transport it and my field gear without issue.

@LBJ: Can you verify that my cable runs are correct? I made a couple diagrams for it....



Cheers,
Steve

[LBJ]

I would just number from the first point to the last on your diagram 1 thru 16. But, it makes it easier if you do the roughest perspective sketch instead of a front and side view. Then number each point 1 - 16.

You are basically making big "X" patterns. I can mail you my sketch if you like.

You'll get it correct.

I would mention one thing. Check out all the little brass hardware for the rigging and the clevis'. There was a large descrepancy in the two. Not very tight when threaded in. I ended up CA'ing all the brass into the clevis before I flew so they didn't pull apart. I would seriously check them out before hand. A set or two from Proctor or the like wouild be a good investment.

[steve1814]

I would mention one thing. Check out all the little brass hardware for the rigging and the clevis'. There was a large discrepancy in the two. Not very tight when threaded in. I ended up CA'ing all the brass into the clevis before I flew so they didn't pull apart. I would seriously check them out before hand. A set or two from Proctor or the like would be a good investment.

Funny you should mention that...I noticed one of my elevator cables was really slack when I got home today - seems that the clevis let go overnight as the brass threaded rod was hanging on the cable and the clevis was still attached to the control horn:eek: looks like I'll be getting some new parts this weekend, I don't even want to chance it.

I just got through watching the video again. I think I have it this time:rolleyes: Somewhere I got the assumption that there were TWO cable runs in the interplanes, not one continuous, not counting the two runs on the top of the upper wing.

I got the X-mount bolted to the "firebox"(?) and did a dry fit for the cowl and motor shaft. All looked good there. I won't secure the firebox to the "firewall" until I have the C/G correct though. I am still hoping that the added weight of the A123's will be enough to forgo the dead weight. If not I want to be able to pull the batteries out of the firebox and mount them on the outside, closer to the prop to lessen the dead weight.

Cheers,
Steve

[LBJ]

Yes, one LONG run of cable inside the wings. You only have to run the cables once, so it isn't too much to deal with. That's the beauty of this design, take the wings off and no rigging to mess with.

The part about the brass fittings is that they will not take a "load" when you tighten up the little nuts to keep the adjustment tight. When you put pressure on them, they just pop out. So,that's why I got them in place then CA'ed them. You could use thread locker I suppose. That would be reversable because the CA is not, as I found out.

I guess you noticed, but the bottom wing tube is longer than the top one! Only about an eight of an inch, but just enough to screw you up should you pick the wrong one first.

One more shot of the wing.
http://img.photobucket.com/albums/v228/numskin/IMG_0501.jpg

[steve1814]

Boy, what a challenge it was to get the wings joined together and mounted on the fuselage! The wing tubes are really, really tight and I was getting very agitated with them - to the point I was about to give up! I tried sanding, waxing, and graphite and they still wouldn't go on smoothly. I finally was able to coax the pieces together and then spent the next 30 minutes trying to get the upper and lower wings aligned. It was an exercise in patience, and I suggest that if you have one - get a friend to help! I just pray that I can get them back apart!


The flying wires went smoothly for the most part - I did have to restart a couple times because I just wasn't happy with the original anchor points on the middle strut. The Clevis either got in the way, or was binding to the point I thought the clip would spring open. As you can see in the picture below, I changed out the hardware and like it much better. I still have the other wing to do, but now that I know what's what, it should go quickly.

The Motor fit well and was easy to line up. it pokes through the cowl right where it should and looks great. Once I get my battery packs made up I'll start testing for C/G to see what location the batteries end up in.

Wish me luck on getting the wings off!




http://www.bentprop.net/RC%20folder/Giant%20Jenny/IMG_1404_copy%281%29.JPG


http://www.bentprop.net/RC%20folder/Giant%20Jenny/IMG_1408_copy%281%29.JPG


http://www.bentprop.net/RC%20folder/Giant%20Jenny/IMG_1411_copy%281%29.JPG


http://www.bentprop.net/RC%20folder/Giant%20Jenny/IMG_1410_copy%281%29.JPG


http://www.bentprop.net/RC%20folder/Giant%20Jenny/IMG_1414_copy%281%29.JPG




EDIT: Oh, and I did find this on Giant Sierra's web page, definitely worth looking into- comes in 10mm X 1.0 and 1.25 pitch


http://www.sierragiant.com/images/PropWasher.JPG

Cheers,
Steve

[mmmdowning]

Very nice, good work guys.

[steve1814]

HTML clipboard Got a friend to come over and we slowly pulled the wings off. They were still really tight, so I took a piece of schedule 40 PVC pipe (1/2") and CA"ed a piece of sandpaper to it. I then inserted the pipe into the wing tube slots and smoothed the tube out. THAT DID THE TRICK! The Tubes now slide like on glass and make the installation and removal a breeze!

As you can see in the pictures below, the 6S1P packs are ready to be made. I have the cases CA'ed together to make the 6S pack so the battery bars will line up right. This weekend I hope to get the packs fully done, then I can test C/G!




Cheers,

Steve

[steve1814]

LBJ,

Couple questions..

1. Did you balance on the main spar of the upper wing?

2. What did you use for control throws-I couldn't find that info anywhere?!?!

Cheers,
Steve

[LBJ]

I'm shootin' from the hip here, but I think it was one-half inch BEHIND the main spar. The figure is 5.5 inches I THINK. I need to look it up to be sure. The throws were what they were. I never found anything either. It flew fine though! I can measure mine for you. I'll get back on this. It only needed 1.5 lb weight to balance out.

[LBJ]

The guide says the CG is 140mm from the leading edge of the forward wing. That's 5.6 inches. Should be just a half inch behind the wing spar.

I will have to do the elevator throws on another day. I got to move some stuff around to get to the tail feathers to get a measurement. The ailerons may have to be on your guess since they are yet another thing to hook up off the plane. I don't think those are critical for the Jenny. I do remember that the rudder is full deflection left and right.

Got a scale meet/fun fly on Sat so I have been busy finishing my OK/V Pro/OhYes MiG-15. Not going to take the Jenny this meet. So, I will try to get to that later in the week or early next week. LBJ

[steve1814]

Thanks, LBJ! I figured as much on the rudder control, most my planes have about the max in rudder.

Have fun at your fun fly!

Cheers,
Steve

[steve1814]

Got all my battery packs done and decided to do a little test run without a prop to make sure everything works before permanently mounting everything - wound up frying the ESC :( I don't know what happened, but when I first plugged the ESC in, I didn't get any response, so I checked it on the programming card and everything looked OK, hooked everything back together and got a sick sounding "beep" with no cell count. Throttle up produced severe cogging and then a nice "pop" followed by a puff of smoke from the ESC. Needless to say, the incident took most of the zing out of the build for me so the project has been shelved for a couple weeks.

I did test the motor on 6s with a non-HV 80 ESC I have and it worked flawless. Further investigation shows I may have had the timing on low and that has fried these ESC's. Quote from Website: WARNING: For some large motors, you must use High timing mode. Failure to do so will result in a burnt esc. Wish I would have known this prior to the appearance of smoke :eek:. I do believe that a Castle 110HV is in my immediate future.

Cheers,
Steve

[BrentP]

Steve
Curious what brand ESC did you fry? Was It a turnigy? I've had no problems with my turnigys and cc but some guys have had cc fry and I witnessed a cc go up in smoke at a float fly 2 weeks ago.
Brent

[steve1814]

Steve
Curious what brand ESC did you fry? Was It a turnigy? I've had no problems with my turnigys and cc but some guys have had cc fry and I witnessed a cc go up in smoke at a float fly 2 weeks ago.
Brent

It was the Turnigy Sentilion 100A HV - I think it may have been faulty from the factory. I had bought it for another project a while back and never did power it up-until now:(

Cheers,
Steve

[BrentP]

Thanks Steve. Man that's a really downer to have it fry. I guess on the bench is better then in the air though with such a sweet plane.
Cheers
Brent

[LBJ]

Steve, got around to hooking up the Jenny to see what throws were on the elevator. Measures 2-3/4 inches UP and 2 inches DN. At full rates. At low rates, I use 80 percent throws. Hope you got the SC troubles behind you. I will get it out for the local all electric fly in on Nov 1st. So, need to start looking it over pretty closely before I take it out again. I need to double check those potentially loose brass rigging fittings at the servos to see if they are tight. Going to CA them anyway. Got a new 22 inch prop to fly and a new set of three Rhino 4S 3750 LiPos. Should be set! Good luck on the Jenny flight when you get to it. LBJ

[steve1814]

LBJ,

Thanks for the information. I got a Castle 110HV so hopefully it won't fry on me too. The Jenny is hanging in the workshop right now- I haven't made any real progress on it-I want to keep my motivation going on this thing, but having to buy an additional ESC really left me well, pissed off!:o That and I have to get the house ready for winter which has my attention right now.

I do have the batteries built, and that is presenting me a puzzle as well. I want to make the maximum use of the weight of the batteries by putting all four packs as far forward as I can get them, but the "motor box" isn't quite long enough to support the batteries. I am thinking on building a larger box that can house the batteries and still provide decent cooling. I did notice that my fuselage lacks the cutouts in the firewall above the motor box like yours, so I'll have to provide some exit holes as well. I'm sure the bug will hit me again and I'll be out in the workshop with a great idea on how to hold the batteries.

Good luck with your flight-I'm looking forward to hearing how the 22" prop works out.

Cheers,
Steve

[atlav8r]

We built a much longer motor box for ours and placed the packs all the way up front.

Cliff

[steve1814]

Cliff,

Got any pictures of your Motor Box? My only hesitation with building a larger mount is getting the thrust angle right.

I had wanted to get all slick and make a power distribution panel. Since the Batteries are A123's I had planed to charge them in-place as four 6S1P's with a bank of chargers. My goal was to build a panel on the side of the motor box that would provide a "patch panel" for a 12S2P configuration for flight and then via a scale hinged panel on the side of the cowl, be able to pull the patch cords and plug in the chargers. Now, I just want to get the thing finished before 2009...:o

Cheers,
Steve

[steve1814]

Oh- I forgot to mention...Richard Sang did get me the new 'Kelly Field' decals as promised, so Kudos to him:) He also provided me the factory recommended control throws:

Control Throws:
Aileron 55 degree
Elevator 50 degree
Rudder 30 degree

While, I appreciate all the effort in obtaining them (the control throws), I was a bit skeptical about the elevators and Ailerons have such a large degree of movement and the Rudder with so little. It has always been my judgment to have little elevator and lots of rudder. I will go with LBJ's setup and see just how much of a difference in degrees there is.

Cheers,
Steve

[LBJ]

The elevator throws were the result of using the larger than normal servo arm that was suggested (or similar). This is just how it happened to come out. It worked fine, and there was nothing scientific about it at all.

[karl k]

Steve, I would caution against using the CC110HV on 12s a123's.

I had the same setup in my Husky, but I went through 2 castle controllers. The second failure cost me the plane.

It has come to my attention that the resulting spike in voltage when a large current draw is removed from these batteries is enough to fry the Castle controllers.

My Turnigy 100A HV controller worked flawlessly in a replacement plane, though.

Karl

[steve1814]

It has come to my attention that the resulting spike in voltage when a large current draw is removed from these batteries is enough to fry the Castle controllers.Karl

Karl,

I really don't understand your statement. What voltage spike would I get from drawing 90 Amps out of the batteries?

Cheers,
Steve

[Thomas B]

Lane, make sure you bring that large Jenny out to T-Bird field for the electric fly in this coming Saturday, Nov 1. I'd love to see it in the air!