Project Dyn-E-Max/ TJ A-4 - Page 3

Ron101 · Oct 16, 2009, 01:42 AM

I'm with you on cuting 3" up and release the inner wall.. but on this plane if you glue the ducts together you will never get them out or the fan..

So I'm going to cut some light ply pie pieces to hold the inner wall out.. glue them in place... then use a little silicon on the inside of the duct to make it smooth... then once the fan and ducts are in place I'll tape it up airtight with beldrem tape.. or maybe even silicon. that way I can cut it if the fan needs to come out

it should be pretty easy

monkamarm2000 · Oct 16, 2009, 02:52 AM

yeah those ducts were ruled for electric 120mm from turbine, so there never were gasser ducts, so spinner fairing. And ron those figures are right in line to me! but keep in mind its less a case of fan and more a case of the small tail pipe in that A-4. Best I see is usualy 11.5 pounds, and thats with either the DS on 5kw orthe TJ on 3.8. And like Brett said any of that is only s good as your velocity to maintain it. If ya had 40 pounds but only 100mph velocity then its all gone at 100mph, the more you have the more you get to keep in flight. And! how broad your velocity band is, says how much you get to keep in middle performance flight.

Barry

monkamarm2000 · Oct 16, 2009, 02:53 AM

maybe i can spin ya up an adpater Ron?

Barry

strictlyscale · Oct 16, 2009, 06:32 AM

Ron, very interested in your progress and comparison. Also looking fwd to seeing how you like the Dynemax in there as I have the same one. Thanks for sharing your progress. Btw, what is beldrem tape? Does it differ from clear duct tape?

rvincent · Oct 16, 2009, 10:12 AM

Quote:

Originally Posted by monkamarm2000

maybe i can spin ya up an adpater Ron?

Barry

I need one!!

GregG · Oct 16, 2009, 10:33 AM

Quote:

Originally Posted by strictlyscale

........ Btw, what is beldrem tape? Does it differ from clear duct tape?

Blenderm surgical tape. Semi transparent and somewhat rubbery with excellent adhesion. Used in models for hingeline on control surfaces.

rvincent · Oct 16, 2009, 10:54 AM

He meant Blenderm

strictlyscale · Oct 16, 2009, 11:56 AM

Quote:

Originally Posted by rvincent

He meant Blenderm

Ahh...lokos lkie eh jsut ahd smoe lettsre bakcwrads.

Is this better than clear duct tape for exhaust ducts, etc?

Ron101 · Oct 16, 2009, 11:30 PM

Today would have gone fast if I didn't lose my mind on a quest to lose weight

went to a single servo for brakes and retracts, also went to one air tank. I have 7ch rx so I programmed the brakes for full down elevator... when the wheel are up the program is off. This opened up a channel so I could lose the match box and put the nose wheel straight to the RX.. this also got rid of some y-harnesses.. also took off all the extension locks and used fishing line. Removed one RX pack and regulator... end up removing 7.5 oz.

This should put me back to my starting weight with the DS

Looks like I'll stay at 17.5 pounds... so the fan is in.. also put in the ESC

gave it a fast run up and it works.. tomorrow I'll tidy up a few things, get my CG and run my test again to see the Watts, Amps and Static Thrust.. if all is well it flys Sunday

corsair nut · Oct 16, 2009, 11:54 PM

nicely done! im going to run up the 12s turbax in my cougar tonight...looks like were on the same page!

accept i gained 1.5 lbs...alot of that was battery...went from 20c 5000 to 25c 6000. also, motor from 1415 to 1527! :O the turbax is accualy a very light fan. i bet it would fly a tam A-4 real nice. cant wait to see some vid ron!!! well done. i wish i could shave 8 oz from my 13 lbs F-86!

SCALEFAN · Oct 16, 2009, 11:55 PM

There are several types of clear or white duct tape. Some tapes are stronger than others, some tapes will actually remove the paint or covering when stripped off your plane. I know first hand about this.

The word "duct tape" is a general term, also called 100mph tape in the general aviation industry.

A story:

An old guy at Corona airport started his Cessna 172, went to full throttle while in his tie down, the plane was not tied down, and it laterally flew 200 feet into my buddies hanger and crashed through his hangar door into his Ballanka Viking . The Ballanka has wooden wings. (yes I spelled it wrong) and both leading edges wire dented badly. The next day Terry checked the prop to make sure the crank was not bent, put 100mph tape all over the leading edge of the main wings, and flew the plane to Riverside for more permanent repairs. That is why it is called 100mph tape.

All tape is not the same, regardless of the color.

Posting courtesy of Amarone della Valpolicilla, Classico wine from Italy. Normally 60 to 80 bucks a bottle in restaurants, 18 bucks and change at Costo. The best that Italy has to offer...who really cares about duct tape? Smooh red wine, no hangover, no head aches..from a special region in Tuscany. Try it...

rvincent · Oct 17, 2009, 12:04 AM

Nice Ron, but you want brakes on full down elevator

If you are ripping down the runway and wish to apply brake it may lift off!

monkamarm2000 · Oct 17, 2009, 12:08 AM

matter of fact duct tape was the fix they sent for cobras flying in dessert storm to fix blade delamintion from the sand blasting.

Barry

Ron101 · Oct 17, 2009, 12:17 AM

Hey Bob..
I'm half a sleep... it is full down..lol
I was up at 3:30 couldn't sleep...you'll have to cut me some slack
I'll edit that
thanks

Thanks CN... Can't wait to hear how your run up goes
back to it in the morning

Ron

SCALEFAN · Oct 17, 2009, 12:43 AM

When the plane leaves the ground, and you can't land back straight on the same runway, gear up. So, the gear goes up quick. Build up speed, flaps up before you turn or climb.

Landing, full flaps down if needed, get the plane on the runway, flaps up quickly, then apply brakes. If you apply brakes with the flaps down you are burning up tires and doing very little to slow down.

Windy situation, headwind or crosswind, best to land with no flaps, Why I can't tell you, I just know how to do it. Brakes? only when sure you are down and sufficient speed has bled off. You are going to put some wear on the tires in a windy situation and you are going to land longer due to keeping the power on, in reserve.. Wind shear is a serious enemy of RC airplanes.

It's all so routine, but the emotion and excitement often gets us screwed up. No time for checklists.

Oct 16, 2009, 11:30 PM	#39
Ron101 Registered User Join Date: Jul 2007 Location: Brentwood, California Posts: 1,950	Today would have gone fast if I didn't lose my mind on a quest to lose weight went to a single servo for brakes and retracts, also went to one air tank. I have 7ch rx so I programmed the brakes for full down elevator... when the wheel are up the program is off. This opened up a channel so I could lose the match box and put the nose wheel straight to the RX.. this also got rid of some y-harnesses.. also took off all the extension locks and used fishing line. Removed one RX pack and regulator... end up removing 7.5 oz. This should put me back to my starting weight with the DS Looks like I'll stay at 17.5 pounds... so the fan is in.. also put in the ESC gave it a fast run up and it works.. tomorrow I'll tidy up a few things, get my CG and run my test again to see the Watts, Amps and Static Thrust.. if all is well it flys Sunday Attached Thumbnails Pie shape glued in then glassed over 59.4 KB · Views: 57 sanded the inside smooth and hit with some chalking 43.9 KB · Views: 61 went to single servo operation for retracts and brakes and one tank... also programmed down up elevator for brake.. opened up a channel..so I lost the match box and put the nose wheel servo to the RX 47.7 KB · Views: 64 Got rid of all the extenson lock and used fishing line..ditched one tank, RX pack and reg, match box..y-harness... all added up to 7.5 oz. 79.5 KB · Views: 66 fan installed and taped up ait tight 53.8 KB · Views: 74 air tight 55.1 KB · Views: 72 gave it a fast run up... all is well! tomorrow sort a few things .. then CG.. and run the numbers 72.7 KB · Views: 76 Last edited by Ron101; Oct 17, 2009 at 12:18 AM.

Oct 16, 2009, 11:55 PM	#41
SCALEFAN Show your beef, I show chicken Join Date: Feb 2006 Location: Anaheim, California Posts: 3,684	There are several types of clear or white duct tape. Some tapes are stronger than others, some tapes will actually remove the paint or covering when stripped off your plane. I know first hand about this. The word "duct tape" is a general term, also called 100mph tape in the general aviation industry. A story: An old guy at Corona airport started his Cessna 172, went to full throttle while in his tie down, the plane was not tied down, and it laterally flew 200 feet into my buddies hanger and crashed through his hangar door into his Ballanka Viking . The Ballanka has wooden wings. (yes I spelled it wrong) and both leading edges wire dented badly. The next day Terry checked the prop to make sure the crank was not bent, put 100mph tape all over the leading edge of the main wings, and flew the plane to Riverside for more permanent repairs. That is why it is called 100mph tape. All tape is not the same, regardless of the color. Posting courtesy of Amarone della Valpolicilla, Classico wine from Italy. Normally 60 to 80 bucks a bottle in restaurants, 18 bucks and change at Costo. The best that Italy has to offer...who really cares about duct tape? Smooh red wine, no hangover, no head aches..from a special region in Tuscany. Try it... Last edited by SCALEFAN; Oct 17, 2009 at 12:02 AM.

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Oct 16, 2009, 01:42 AM	#31
Ron101 Registered User Join Date: Jul 2007 Location: Brentwood, California Posts: 1,950	I'm with you on cuting 3" up and release the inner wall.. but on this plane if you glue the ducts together you will never get them out or the fan.. So I'm going to cut some light ply pie pieces to hold the inner wall out.. glue them in place... then use a little silicon on the inside of the duct to make it smooth... then once the fan and ducts are in place I'll tape it up airtight with beldrem tape.. or maybe even silicon. that way I can cut it if the fan needs to come out it should be pretty easy

Oct 16, 2009, 02:52 AM	#32
monkamarm2000 Registered User Join Date: Aug 2002 Location: NorCal Silicon Valley Posts: 11,105	yeah those ducts were ruled for electric 120mm from turbine, so there never were gasser ducts, so spinner fairing. And ron those figures are right in line to me! but keep in mind its less a case of fan and more a case of the small tail pipe in that A-4. Best I see is usualy 11.5 pounds, and thats with either the DS on 5kw orthe TJ on 3.8. And like Brett said any of that is only s good as your velocity to maintain it. If ya had 40 pounds but only 100mph velocity then its all gone at 100mph, the more you have the more you get to keep in flight. And! how broad your velocity band is, says how much you get to keep in middle performance flight. Barry

Oct 16, 2009, 02:53 AM	#33
monkamarm2000 Registered User Join Date: Aug 2002 Location: NorCal Silicon Valley Posts: 11,105	maybe i can spin ya up an adpater Ron? Barry

Oct 16, 2009, 06:32 AM	#34
strictlyscale Dream Build Fly Scale Join Date: Oct 2004 Location: Philadelphia, PA Posts: 530	Ron, very interested in your progress and comparison. Also looking fwd to seeing how you like the Dynemax in there as I have the same one. Thanks for sharing your progress. Btw, what is beldrem tape? Does it differ from clear duct tape?

Oct 16, 2009, 10:54 AM	#37
rvincent 20,000 Screaming Watts! Join Date: Jul 2004 Location: Fontana, California, United States Posts: 17,663	He meant Blenderm

Oct 16, 2009, 11:54 PM	#40
corsair nut 150mph 90mm JHH COUGAR 3.5KW:D Join Date: Jan 2006 Location: tehachapi, CA Posts: 10,156	nicely done! im going to run up the 12s turbax in my cougar tonight...looks like were on the same page! accept i gained 1.5 lbs...alot of that was battery...went from 20c 5000 to 25c 6000. also, motor from 1415 to 1527! :O the turbax is accualy a very light fan. i bet it would fly a tam A-4 real nice. cant wait to see some vid ron!!! well done. i wish i could shave 8 oz from my 13 lbs F-86!

Oct 17, 2009, 12:04 AM	#42
rvincent 20,000 Screaming Watts! Join Date: Jul 2004 Location: Fontana, California, United States Posts: 17,663	Nice Ron, but you want brakes on full down elevator If you are ripping down the runway and wish to apply brake it may lift off!

Oct 17, 2009, 12:08 AM	#43
monkamarm2000 Registered User Join Date: Aug 2002 Location: NorCal Silicon Valley Posts: 11,105	matter of fact duct tape was the fix they sent for cobras flying in dessert storm to fix blade delamintion from the sand blasting. Barry

Oct 17, 2009, 12:17 AM	#44
Ron101 Registered User Join Date: Jul 2007 Location: Brentwood, California Posts: 1,950	Hey Bob.. I'm half a sleep... it is full down..lol I was up at 3:30 couldn't sleep...you'll have to cut me some slack I'll edit that thanks Thanks CN... Can't wait to hear how your run up goes back to it in the morning Ron

Oct 17, 2009, 12:43 AM	#45
SCALEFAN Show your beef, I show chicken Join Date: Feb 2006 Location: Anaheim, California Posts: 3,684	When the plane leaves the ground, and you can't land back straight on the same runway, gear up. So, the gear goes up quick. Build up speed, flaps up before you turn or climb. Landing, full flaps down if needed, get the plane on the runway, flaps up quickly, then apply brakes. If you apply brakes with the flaps down you are burning up tires and doing very little to slow down. Windy situation, headwind or crosswind, best to land with no flaps, Why I can't tell you, I just know how to do it. Brakes? only when sure you are down and sufficient speed has bled off. You are going to put some wear on the tires in a windy situation and you are going to land longer due to keeping the power on, in reserve.. Wind shear is a serious enemy of RC airplanes. It's all so routine, but the emotion and excitement often gets us screwed up. No time for checklists.