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Td 049 pusher boomerang ...!!!

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Td 049 pusher boomerang ...!!!

Old 12-17-2020, 09:06 PM
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combatpigg
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Default Td 049 pusher boomerang ...!!!

The heart of this project is of course....
a slab of 1/4 inch thick balsa for the wing...
a Cox TD 049 with a Nelson head and fueled with a high pressure latex bladder
a APC pusher prop that was designed for electric motors but modified so that a TD can spin it fast enough to push this plane close to the speed of sound.

I just noticed that "ALL CAPS THREAD TITLES" aren't permitted any more..?



Last edited by combatpigg; 12-17-2020 at 09:09 PM.
Old 12-18-2020, 06:02 AM
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What is the prop size, span and squares?
Old 12-18-2020, 07:44 AM
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Originally Posted by Pond Skipper View Post
What is the prop size, span and squares?
The props were sold as pusher / puller pairs. They are 4 x 4.5 with big paddle blades.
The span...the actual span is 25 inches and there are about 100 sq inches. 5 at the root and 3 at the tips. This balsa is stiff enough that the only spars will be short one in the center section.
The fuselage will be a foam carving that is wrapped with FG cloth and laminated with medium CA glue.
Old 12-18-2020, 02:56 PM
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Swept wing should do well to support a pusher engine conf.
100sq." will make launch less stressful.
Old 12-18-2020, 05:40 PM
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Originally Posted by Pond Skipper View Post
Swept wing should do well to support a pusher engine conf.
100sq." will make launch less stressful.
The swept wing is useful for CG considerations for the most compact design.. The CG @ 20% is a little more than an inch from the TE at the wing root. This way the amount of side area ahead of the CG wont amount to very

much.
Old 12-18-2020, 09:37 PM
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These are 9 gram E Flight servos doubleback taped in place. The fuselage box can now be built around the servos, hang the engine and go flying by coffee break tomorrow.
Old 12-18-2020, 10:35 PM
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I have used the 300mah in two 1/2 outriggers and a .09 plane good battery.
Old 12-19-2020, 08:33 AM
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Originally Posted by Pond Skipper View Post
I have used the 300mah in two 1/2 outriggers and a .09 plane good battery.
I like these too. I'm still waiting for the 220 NIMHs to show up, but dont feel too handicapped by using these 300 LIFEs for a 049 project.
I'll say something nice about the RX...the pins are strong, well supported and fit the servo plugs perfectly snug. The antenna needs a piece of scotch tape to act as a strain relief to keep the antenna's solder joint from breaking. I got to believe that the range is good out to the range you see me fly at in the videos but I'll do a range check.
Let me put it this way...the range is probably better than my eyes are while flying these tiny planes.

Last edited by combatpigg; 12-19-2020 at 08:44 AM.
Old 12-19-2020, 09:53 AM
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I found some being used with cars here you go..they take PayPaL
It's in the UK shipping sucks you would have to buy 3 to make it worth it.

https://alshobbies.co.uk/Intellect-R...IPLFP652424-2S


Last edited by Pond Skipper; 12-19-2020 at 10:00 AM.
Old 12-20-2020, 10:02 AM
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That's a great find. Just to know they exist..some other battery Supermarket in the USA must have them.
Old 12-20-2020, 10:15 AM
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This was a big deal at a time when the car guys used them but that craze is over most vendors have sold out all stock.
Took looking in the UK to find a following still. 2yrs ago I scarfed up the last of the Reedy 250's


The solar light area has a new cell 2/3rds AAA size 3.2V 200mAh Lithium Iron phosphate LiFePO4
7g button cell /
10.2mm x 24mm
Only way to get them with PayPaL is ebay bulk buy 20 cells or ten 2S / 6.4v packs.
https://www.ebay.com/itm/20PCS-AAA-s....c100290.m3507
Old 12-20-2020, 07:39 PM
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200mah LiFe
Out of Canada so price is inflated need to confirm the miracle of their existence.
https://hobbyhobby.com/product/28548...source-u-conn/

I emailed them to see / can't beat the weight and size.

Last edited by Pond Skipper; 12-20-2020 at 07:47 PM.
Old 12-21-2020, 04:29 PM
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Originally Posted by Pond Skipper View Post
200mah LiFe
Out of Canada so price is inflated need to confirm the miracle of their existence.
https://hobbyhobby.com/product/28548...source-u-conn/

I emailed them to see / can't beat the weight and size.
I remember seeing those advertised everywhere but back then I wasn't interested.
Old 12-21-2020, 05:06 PM
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Yea killed me to find the ones I could 3yrs ago.

Some of my spares and their weights.


Last edited by Pond Skipper; 12-21-2020 at 05:10 PM.
Old 12-21-2020, 08:06 PM
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It weighs 7.25 ozs before covering
The bladder just wouldn't fit in the cargo space below..I had to make the bulbous blister above the wing.
Next time I'll make everything fit in a longer fuselage that's all below the wing.
Old 12-21-2020, 08:55 PM
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Weee looks cool certainly should have good viz with the top add, lends to being a canopy.
Vertical stab should just be enough, certainly at speed. How is the CG looking?
Old 12-21-2020, 10:29 PM
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Originally Posted by Pond Skipper View Post
Weee looks cool certainly should have good viz with the top add, lends to being a canopy.
Vertical stab should just be enough, certainly at speed. How is the CG looking?
Thanks..but .I think it looks like a plane that I drew when I was in Kindergarten..!
At any rate it will be fun to see how it flies
Old 12-22-2020, 01:03 AM
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I think it looks like a plane that I drew when I was in Kindergarten..!
And what is wrong with that?

I think it has a strong Buck Rogers look to it. And that means it looks awesome!

Be a while before the first flights I'm thinking?
Old 12-22-2020, 09:05 AM
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Originally Posted by BMatthews View Post
And what is wrong with that?

I think it has a strong Buck Rogers look to it. And that means it looks awesome!

Be a while before the first flights I'm thinking?
Hi Bruce..!
Remember those gawdawful 1950s Custom Cars that looked like nobody bothered to do a sketch before firing up the grinders and the cutting torches..?
https://www.jalopyjournal.com/forum/....779456/page-2
If you like automotive "BUILD THREADS" the HAMB is the place to go.
Today is a nice day to go flying but all the local fields are flooded.
I wont be so anal about keeping the finish of this pusher plane super light..so with plenty of NO FLY DAYS in the forecast it's a good excuse to spend more time trying to make a plane look nice.

Last edited by combatpigg; 12-22-2020 at 10:06 AM.
Old 12-25-2020, 10:36 AM
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Unbelievably the finished weight is 7.75 ozs. I used Klasskote epoxy paint satin black but it was too cold to get it to flow out. After the paint cured I sanded it to get rid of the bumps, contact cemented a couple of thin gift wrap strips on top of the wing and called it DONE.
Old 12-25-2020, 10:59 AM
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Nice, the silver should help flash a reference.
All colors turn to black from a distance anyways, great weight Chuck well done!
T -10 I image when the field dries up. Happy Holidays!
Old 12-25-2020, 05:06 PM
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Originally Posted by Pond Skipper View Post
Nice, the silver should help flash a reference.
All colors turn to black from a distance anyways, great weight Chuck well done!
T -10 I image when the field dries up. Happy Holidays!
Thanks Brad..I hope to maintain orientation long enough to run the engine out of fuel,,about 2 minutes without blinking.. Too bad this glittery foil I used for the stripes doesn't shrink because it would make a pretty wild covering material.
Happy Holidays to you too.
Old 12-26-2020, 05:58 AM
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At first I thought it looked like a Stryker, but now it looks like it came out of the Batcave. Nice work in only 8 days.
Old 12-26-2020, 10:32 AM
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Originally Posted by aspeed View Post
At first I thought it looked like a Stryker, but now it looks like it came out of the Batcave. Nice work in only 8 days.
Thanks..it was a good way to use a sheet of 1/4" balsa [my last sheet of a supply I bought 10 years ago] that was kind of heavy....a swept wing is more difficult to inlay with a spar because you have to slice through so much of the balsa grain to get it in there. This heavy sheet of balsa seems strong enough without having a massive spar.
I remember the Stryker now...it was one of the only electric designs I ever saw at the local field.
Old 12-26-2020, 10:59 AM
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The guys in my old club in Waterloo Ontario still fly the Strykers for a pylon/combat race. They use the 1/2"? pink foam traced from the original and coroplast rudders with electric of course. They have lots of fun with them.

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