96" Rearwin Speedster W/ Hxt C 63-74

[staggerwing]

In 1934 Andrew Rearwin with his two sons added to thier existing successfull designs a sleek two place relatively high performance 32' high wing designated the Speedster 6000M --the M indicating it had the 125 HP Menasco inverted 4 cyl verses the "C" version having the lesser 100HP Cirrus eng..
It ranked well among other interesting designs of that era having a semi-symetrical airfoil and a top speed of 166 MPH w/ a 140 MPH cruise.

This built up 1/4 scale version (my 3rd large EP model) came from an old Bridi kit & was built for gas power per the plans therefore it is beefy & heavy, having a AUW of just over 20lbs w/ equipment shown.I purchased the unflown airframe from its second owner in need of LOTS of TLC .
It would have been easier to scratch build another as I eventually found out.


Here are some pre-flight numbers from a bench test so far w/ not fully charged lipos;
Prop---APCE 22 X 12 wide blade
RPM---5100
1475 watts @ WOT----------4/12/07 update w/ fully charged batts-----1649 watts
56 amps @ WOT @ 24.34 V
motor & ESC (80A Sentilon HV 12s) were cool to the touch after WOT.

From this short run, I can tell this set up will fly the plane to my needs & I'll expirement w/ smaller props but the thrust from a large prop is what I
intended/wanted from this set up.
Batts used---(2) 4s 6600 EP pks in series producing 8s

Some mentions from the pics;
motor mount/spacer is one piece cedar--very light
batts are easily shifted fore & aft for CG & accessability & secured w/ velcro.Alum batt tray I fabricated from 2024 T3 alum & cowl from F/G.
Cowl was intended to look scale w/ cutouts & brass replica of Menasco exhaust & (cowl) is held in place w/ (4) locating pins & magnets.
Arming device is a pos wire w/ disconnect accessable in cowl bottom vent.
Paint is Krylon Navy blue hand rubbed on whl pants & cowl. I hope this paint stays on the market as I've used it for yrs---it's the closest to auto lacquer you can find @ under $3 a spray can--EPA regs have made auto lacquer impossible to afford if you can find it.
From the single review I could find, this is a FAST model & definitely not a floater, so when the weather cooperates, I hope to find out

see additional post for rest of pics

[staggerwing]

Additional pics

[Goinav8n]

Very nice. Ill keep an eye out for the first flight. I hope the snow melts soon.

Jeff
Formerly from Brackney

[Milton]

Great looking plane, I put together one of the Kangke 1/4 scale Rearwin's about two year's ago and it came in at 20 lbs. I had a Axi 5330-18 0n 8S and a 20-10 pro zinger wood prop putting out 1950 watts, Flew the plane great with plenty of power

http://www.kangkeusa.com/superkraft.htm

There is a vid of it somewhere here but can not find it, It was in my trailer when stolen last year but have picked up another one from a freind of mine that was set up for gas and going to convert it to electric. Hope to have it finished by SEFF meet.

It has to be one of the best sport flying planes that I have ever had.

Here is one pic of it on landing approach

http://www.rcgroups.com/forums/attachment.php?attachmentid=582221

Milton

[8kasl]

Great looking Speedster!!!I have the same motor and it's the 200 KV version and the color is amber.Just wondering if you have the 280 KV since 5100 divided by 24V=212.5KV.Motors never hold full KV under load.

[staggerwing]

Great looking Speedster!!!I have the same motor and it's the 200 KV version and the color is amber.Just wondering if you have the 280 KV since 5100 divided by 24V=212.5KV.Motors never hold full KV under load.

It is the 200 KV I have--maybe my tach was not getting correct light in the garage. Next run up will be outdoors above 30 degrees w/ fully charged batts .

Milton---that is a great pic of your Speedster !
I noticed in the Rearwin history they produced a BEAUTIFULL radial engined bipe called the Ken-Royce (after Andrews two sons first names) but I've never seen it modeled.

[Milton]

Found the vid of the Kanke ARF and loaded it, This was the first flight and the first part of vid was triming it out. From about 2min 45 sec to 3min 40 sec in the vid was with no power just to see how it would stall and float.

http://www.rcgroups.com/forums/showatt.php?attachmentid=1254650

Milton

[8kasl]

Stagger,It my be that the motor is the 280Kv but they put the 200KV sticker on it.When I ordered mine,I asked for the 280 version and mine came with the 200 sticker so who knows but the 280 will run on less cells in series.I don't plan on running high speeds just scale-like performance--60-70W/#
Rich

[Stuntman]

double post :rolleyes:

[Stuntman]

Beautiful plane and super finish. Really classy.

I just purchased this motor and the same/similar controller. My motor is purple too.

I am intending on using it in a hanger 9/minicraft clipped wing taylorcraft on 10S (intially with a couple of TP4200 5S in series) with a bollywood 19x10 or 20x8, and will be setting the plane up for aerotowing eventually.

I was originally going to use a 1.60twin 4S but since getting the plane and the motor (oh, it'd have to be 4years or so ago now...:D), I have since gone completely E-powered and just sold off the twin. Hoping to get it started in the next couple of weeks.

cheers, Shawn

[staggerwing]

Shawn,
Do a search in "power systems" for Welgard C6362 & you'll find the 85" H9 Taylorcraft conversion I did using a Wellgard C 6362-10 , It flys very well on 8s.(same batts as in the Speedster)
I'm sure the HXT will do well for power on either 8 or 10s.

Bob

Well I tried to add just the link & did the whole thing !?

News - 85" Hangar 9 Taylor Craft w/ Welgard C6362-10

Hello Gang,
This is my 2nd conversion of a larger gas model , the first being a 72" Eastborne Monoplane w/ a TP 3520-7 which flys beautifully w/ excess power, elsewhere in this forum .
This TC was purchased from a gent in Ontario who flew it with a large Saito, whereby I had a bit of re-glassing & complete paint job to do on the cowl--ah, but it was worth it now to see it scale,clean & unchopped, w/o any hardware dangling out of it in the wrong places.

I'll list prices & sources for major components only to show larger conversions can be accomplished inexpensively if you shop around.

I chose the Welgard C 6362-10 from BP Hobbies @ $136 as it seemed to have the features I was looking for plus invaluable support from BP in NJ as they helped design the motor & it carries a 90 day warrantee along w/ good product/user literature @ purchase.
(2) 6600 MAH EP 8c 4s lipos wired in series for 8s came from Xus @$75 ea when its owner was purging stock of his lesser c lipos awhile back.
ESC is the Hextronic 100 amp from United Hobbies @ $70 which despite some negative feedback here in RCG used above 40 volts, programmed & is working flawlessly for me @ 8s (33 volts unloaded)

So roughly $350 for major components---the cost of a G 26 ?

When time & dryness permits, I hope to fly this (soon !) , but will list static results of motor runs.
TC RTF weight--15 lbs 4 oz
RPM'S @ WOT w/ 20X10 APCE---5500; watts---1300--(2) 2 min runs
Estimated thrust--14 lbs
.03 amps @ rest, 40 amps @ WOT
Temps--- motor after run--barely warm----ESC-cool to touch
2100 mah NIMH RX batt is separate.

RE-pics;
The (2) batts extend thru 3/8" firewall on alum batt trays which allows easy batt removal & CG adjust & are velcrowed in place.
I cut the one piece 3 1/2" motor extension from cedar--(4 1/2 oz) , & used (4) 3/16 studs threaded @ both ends---I'm not fond of the hardware store threaded rod/spacer routine for these larger motors whereby this solid spacer puts only (1) stress on the fasteners---tension---no torsion.
The arming device is an accessable batt + wire at the bottom of the cowl w/ 4mm connectors.
For the cowl I used (4) 5/16" dia rare earth magnets --along w/ the existing fuse tabs to position & rotationally lock in the cowl---those magnets have incredible strength !
Batt access is an easy 30 seconds removing spinner, prop & cowl.
Will add flying pics when avail---sorry no videos---I have dial up .

Thks for viewing
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Last edited by staggerwing : Nov 30, 2006 at 09:14 AM.

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[Stuntman]

thanks Bob,

Sorry to steal your thread :D. I like your motor and cowl mounting method. Will go the same route myself I think.

I am hoping the 63-74 will draw about 45ish amps on 10S with the 20x8. Although the bolly wood is quite a wide prop so it might suck a little more. I'd go the ApC-E route but already have a couple of these bollywoods I want to use

thanks, Shawn

[8kasl]

Staggerwing,How's the 63-74 holding up so far?Also,I believe the wood and composite props put out more thrust and don't seem to distort at higher RPMs as the plastic APSE's do.Just wondering if you have or can get a video of your plane?
Rich

[staggerwing]

Rich,
The weather here has been so poor that I've not yet flown it---when it's not raining it's too windy. I have dial up so a video is not practical for me but hope to get some pics soon @ maiden. Maybe will try some other props---not sure right now .I have two of these HXT motors & am contemplating putting the other in a 105" Top Flite Stinson I'm currently restoring so I'm also very curious to see it's performance in the Rearwin.

Our club, "The Binghamton Aeros' is a IMAA sanctioned club & this yr will be sponsoring a 3 day Dist II MINI FEST here at the Chenango Bridge Airport near Binghamton NY.
We're hoping we see some elec giant scale participants other than myself attend the event Aug 10, 11, & 12th.--plenty of camping room.
The beautifull still active grass strip airport dates back to the 20's having had most all of the aviation greats of the early days utilize the field.

Bob

[8kasl]

Bob,just take the plain to a gymnasium or basket ball court and fly.Really,I here you on the weather.How have you delt with the really large prop shaft?I hate to try a prop having to drill it out and if it turns out to be the wrong dia. or pitch then it will no longer fit "normal" prop shafts such as AXI 53-30-18 I have.

[staggerwing]

Bob,just take the plain to a gymnasium or basket ball court and fly.Really,I here you on the weather.How have you delt with the really large prop shaft?I hate to try a prop having to drill it out and if it turns out to be the wrong dia. or pitch then it will no longer fit "normal" prop shafts such as AXI 53-30-18 I have.


I don't think you have a choice but to drill it & then sleeve it back if needed w/ some good tubing ----I know what you're saying---these larger props aren't cheap.
For drilling--------
Borrow some ones digital calipers to make sure you have the right dia drill---then, read the instructions that come w/ the prop as to which side to drill & support the hub perpendicular to the drill in a drill press & drill VERY SLOWLY.
If you try to plunge thru w/ the drill, chances are the flutes of the drill will grab the plastic & try to suck it up into the drill @ an angle, ruining your efforts & sometimes the prop.
Better yet, take it to a friend &/or machinest who has the skill & tools to drill it out.

[8kasl]

Bob,I made a mistake on my previous post in reference to my AXI 5330.I just checked again and found that both motors have the same size shafts and prop adapters.I have always had a drill press and agree with you on being careful and accurate--been doing it for over 30 yrs.I guess the tricky part is finding a proper sleeve if necessary.
Rich

[staggerwing]

It's about time I posted my flight info w/ this 20lb set up which turned out extremely satisfying to me.
The HXT provides more than the "adequate power" I expected w/ the 22 X 12 APCE wide blade as it will do just about any basic aerobatic manuver w/ ease & cruises scale like @ about 1/3 throttle.
In my previous mentions, I said "this is not a floater" from a review I read in RCU, however it really is very much like a clipped wing Cub, a little quicker than the full span, but also quite forgiving & will predictably "float" on landing.
Today was about 83 degrees & no excessive heat was felt on the motor after each flight.
Batts charged were 33.3 V & after two approx 8 min flights were 30.7 V so w/ easy flying I think I can go 20 min on these (2) 6600 mah 4s pks in series w/ no harm.
I'm the only giant scale elec flyer in our IMAA sanctioned club & feel some of my efforts will eventually transform some skeptics from thier fuel addictions.

[staggerwing]

Due to a recent display of poor business ethics to me by this vendor, I hope readers appreciate but don't interpret this thread as a reason to deal with United Hobbies ----------

But, I do suggest you try this source --------


http://www.gpsrc.com/

[8kasl]

Bob,Great news about your flights and how the motor performs!Can you get some video?I'm also curious about the UH thing?Oh,did you happen to measure thrust with your setup?Sorry for all the questions but as you know I have the very same motor.
Rich

[staggerwing]

Bob,Great news about your flights and how the motor performs!Can you get some video?I'm also curious about the UH thing?Oh,did you happen to measure thrust with your setup?Sorry for all the questions but as you know I have the very same motor.
Rich

Rich,
Having dial up doesn't lend to videos--sorry, & unfortunately I haven't taken the time to construct a simple thrust indicator I think cause I've been in this hobby so long I pretty well know what's going to fly for my needs & what isn't.
However, I can offer a real life episode w/ the near 21 lb Rearwin that might indicate available thrust w/ my set up.

2nd flight of the day, a gusty crosswind,an overly confident pilot , plus the P factor from that huge prop got me into trouble on a takeoff w/ a right wing tip stall & put the plane in a near vertical positon stalled & hovering about 2' off the ground.
Two split second options available ---do I abort & suffer minor damage or try to power my way out possibly creating more momentum & damage ?
Full throttle applied to the stall/hover condition sucked the plane up & out of the stall to my as well as fellow club members amazement. Whew! a lucky one due to a GREAT power set up.
Hope this helps.
Bob

[8kasl]

Thanks Bob,That says it's got at least22-25# thrust and can fly a 30+# plane.Heck of a deal for a $65 motor!
Rich

[rtn9105]

Staggerwing, great looking Speedster and glad to hear it flies good.
I'm starting a restore project on a Bridi Speedster and was wondering if you could have any info about where some parts might be available from? My plane is built but doesn't have the window openings cut out yet, so I'll be needing to find a place to get the windows from. I also read that you found a review for the plane and was wondering if you could pass that link along?

Thanks for any help
Rob