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» Introducing our Cox .049 TD Engines
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Cox Engine of The Month
July-2024
robot797's
![](https://i.servimg.com/u/f95/15/46/86/41/3_robo10.jpg)
"ULTIMITE COX 010: it has a clutch, E starter, throttle, exhaust, aluminum tank, aluminum venturi, gearbox with forward and reverse, and now its on a custom drawn and printed stand"
![](https://i.servimg.com/u/f95/15/46/86/41/sponso12.png)
PAST WINNERS
robot797's
![](https://i.servimg.com/u/f95/15/46/86/41/3_robo10.jpg)
"ULTIMITE COX 010: it has a clutch, E starter, throttle, exhaust, aluminum tank, aluminum venturi, gearbox with forward and reverse, and now its on a custom drawn and printed stand"
![](https://i.servimg.com/u/f95/15/46/86/41/sponso12.png)
PAST WINNERS
TD .049 SWEPT WING PUSHER BOOMERANG
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TD ABUSER- Gold Member
- Posts : 179
Join date : 2020-11-01
Age : 68
Location : Washington
Re: TD .049 SWEPT WING PUSHER BOOMERANG
Nice work! Please don't get your face anywhere near that prop while the engine is running. Very unsafe.
badbill- Gold Member
- Posts : 312
Join date : 2015-08-13
Age : 67
Location : Centerville, Georgia
Re: TD .049 SWEPT WING PUSHER BOOMERANG
I like it! How is the CG looking?
gkamysz- Gold Member
- Posts : 390
Join date : 2018-02-22
Location : Chicagoland
Re: TD .049 SWEPT WING PUSHER BOOMERANG
gkamysz wrote:I like it! How is the CG looking?
Thanks Greg and thanks again for those fantastic backplate mounts..!
What a difference they make to simplify and remove weight from our TD powered creations.
I think the correct CG is achievable without having to sin. The CG at the wing root is supposed to be where the elevon hinge line meets.
TD ABUSER- Gold Member
- Posts : 179
Join date : 2020-11-01
Age : 68
Location : Washington
davidll1984- Diamond Member
- Posts : 2303
Join date : 2020-02-12
Age : 39
Location : shawinigan
Re: TD .049 SWEPT WING PUSHER BOOMERANG
Are you saying I need a nickel plated cylinder...?
TD ABUSER- Gold Member
- Posts : 179
Join date : 2020-11-01
Age : 68
Location : Washington
Re: TD .049 SWEPT WING PUSHER BOOMERANG
Its bether use them wit bras cylinder plated wit nickel crome Not easy To reproduction one try wit silencer help holding heat on cylinder bring rpm down help engine life if posible To build constant rpm engine Not the fastes wit them just m'y expérience its Not the best solution y try laping piston start wit litle lose fit start hard To explain y am french canadien sory
davidll1984- Diamond Member
- Posts : 2303
Join date : 2020-02-12
Age : 39
Location : shawinigan
Re: TD .049 SWEPT WING PUSHER BOOMERANG
davidll1984 wrote:Its bether use them wit bras cylinder plated wit nickel crome Not easy To reproduction one try wit silencer help holding heat on cylinder bring rpm down help engine life if posible To build constant rpm engine Not the fastes wit them just m'y expérience its Not the best solution y try laping piston start wit litle lose fit start hard To explain y am french canadien sory
Thanks David..I had a Canadian machinist [Andrew J Coholic] explain to me once why an aluminum piston would not work in the Cox Cylinder that is made out of Leadloy.
TD ABUSER- Gold Member
- Posts : 179
Join date : 2020-11-01
Age : 68
Location : Washington
Re: TD .049 SWEPT WING PUSHER BOOMERANG
That's a pretty wild looking design with the large fin and sweep back wings , i am sure it will bee fast ! A few of us bought the Alum. piston and rod (not assembled) from Matt at EX model engines sometime back Brad in Texas was the first I remember here to assemble on and try and it did not last long at all ! I wonder if you were to cut down the skirt and install in a non SPI engine to make SPI it would not over heat as quickly ?
![Huh...](/users/3015/29/34/60/smiles/3929217648.gif)
![Babe Bee .049](/users/3015/29/34/60/smiles/976416.png)
getback- Top Poster
Posts : 10276
Join date : 2013-01-18
Age : 66
Location : julian , NC
Re: TD .049 SWEPT WING PUSHER BOOMERANG
Here is the link as you can see he did alot of break in and i may have been wrong about how long it lasted ?!
![Surprised](https://2img.net/i/fa/i/smiles/icon_surprised.gif)
getback- Top Poster
Posts : 10276
Join date : 2013-01-18
Age : 66
Location : julian , NC
Re: TD .049 SWEPT WING PUSHER BOOMERANG
getback wrote: Brad in Texas was the first I remember here to assemble one and try and it did not last long at all !
I tested the aluminum rod/piston below.
Still have it runs ok if left a bit rich. Can run with a 6x3
to keep the rpm down during break in.
Feb 25, 2019
Cox Aluminum Rod / Piston Bench Test Break In .049
3 short runs prior to this one. Will require patience with some rich
runs till fully broken in. The aluminum expands and it gets tight
if left to run at full throttle then shuts down as demonstrated.
Older worn cylinder would be best polished up to hone the piston.
Grish 5x4 used 25% nitro / 20% castor
![Small Cox Logo](/users/3015/29/34/60/smiles/7356.png)
![Popcorn](/users/3015/29/34/60/smiles/1347041234.gif)
![Thumbs Up](/users/3015/29/34/60/smiles/1541798026.gif)
1/2A Nut- Top Poster
- Posts : 3464
Join date : 2013-10-20
Age : 60
Location : Brad in Texas
Re: TD .049 SWEPT WING PUSHER BOOMERANG
1/2A Nut wrote:getback wrote: Brad in Texas was the first I remember here to assemble one and try and it did not last long at all !
I tested the aluminum rod/piston below.
Still have it runs ok if left a bit rich. Can run with a 6x3
to keep the rpm down during break in.
Feb 25, 2019
Cox Aluminum Rod / Piston Bench Test Break In .049
3 short runs prior to this one. Will require patience with some rich
runs till fully broken in. The aluminum expands and it gets tight
if left to run at full throttle then shuts down as demonstrated.
Older worn cylinder would be best polished up to hone the piston.
Grish 5x4 used 25% nitro / 20% castor![]()
![]()
Thanks for the warning.!
Hear it is painted with Klass Kote over dope that was used as a sealer. Tommorow I'll knock off the shine to give it that Deep Space dullness it's supposed to have.
![TD .049 SWEPT WING PUSHER BOOMERANG Img_0312](https://i.servimg.com/u/f42/20/27/65/46/img_0312.jpg)
![TD .049 SWEPT WING PUSHER BOOMERANG Img_0313](https://i.servimg.com/u/f42/20/27/65/46/img_0313.jpg)
![TD .049 SWEPT WING PUSHER BOOMERANG Img_0314](https://i.servimg.com/u/f42/20/27/65/46/img_0314.jpg)
TD ABUSER- Gold Member
- Posts : 179
Join date : 2020-11-01
Age : 68
Location : Washington
Re: TD .049 SWEPT WING PUSHER BOOMERANG
Y like the look of that model
![Thumbs Up](/users/3015/29/34/60/smiles/1541798026.gif)
davidll1984- Diamond Member
- Posts : 2303
Join date : 2020-02-12
Age : 39
Location : shawinigan
Re: TD .049 SWEPT WING PUSHER BOOMERANG
Wow. That little think looks great and very quick just sitting there alone. Can't imagine how fast it will actually be while running.
NEW222- Top Poster
- Posts : 3895
Join date : 2011-08-13
Age : 45
Location : oakbank, mb
Re: TD .049 SWEPT WING PUSHER BOOMERANG
NEW222 wrote:Wow. That little think looks great and very quick just sitting there alone. Can't imagine how fast it will actually be while running.
Government Agents in dark suits and sun glasses just showed up and confiscated the plane. So we will never know how fast it might have been.....
![Cool](https://2img.net/i/fa/i/smiles/icon_cool.gif)
TD ABUSER- Gold Member
- Posts : 179
Join date : 2020-11-01
Age : 68
Location : Washington
Re: TD .049 SWEPT WING PUSHER BOOMERANG
Look forward to you abusing that TD Chuck!
![Thumbs Up](/users/3015/29/34/60/smiles/1541798026.gif)
The aluminum piston is more of a side line fun project to get running.
Could lap the piston in to speed up the process until the top end can
be held. The engine I tested is very low weight. The aluminum rod and
piston helped to drop off the grams. Could use the engine on a .020
plane that needs extra power.
![TD .049 SWEPT WING PUSHER BOOMERANG 20210110](https://i.servimg.com/u/f39/18/57/77/11/20210110.jpg)
Thrust bearings are possible with a pusher config. / might get 4mph ish on the top end.
![TD .049 SWEPT WING PUSHER BOOMERANG Imag1611](https://i.servimg.com/u/f39/18/57/77/11/imag1611.jpg)
![Small Cox Logo](/users/3015/29/34/60/smiles/7356.png)
![Thumbs Up](/users/3015/29/34/60/smiles/1541798026.gif)
![Thumbs Up](/users/3015/29/34/60/smiles/1541798026.gif)
The aluminum piston is more of a side line fun project to get running.
Could lap the piston in to speed up the process until the top end can
be held. The engine I tested is very low weight. The aluminum rod and
piston helped to drop off the grams. Could use the engine on a .020
plane that needs extra power.
![TD .049 SWEPT WING PUSHER BOOMERANG 20210110](https://i.servimg.com/u/f39/18/57/77/11/20210110.jpg)
Thrust bearings are possible with a pusher config. / might get 4mph ish on the top end.
![TD .049 SWEPT WING PUSHER BOOMERANG Imag1611](https://i.servimg.com/u/f39/18/57/77/11/imag1611.jpg)
1/2A Nut- Top Poster
- Posts : 3464
Join date : 2013-10-20
Age : 60
Location : Brad in Texas
Re: TD .049 SWEPT WING PUSHER BOOMERANG
I've wondered if you can get away with removing the cooling fins. I figured Leroy Cox experimented with that.
I'm not sure but I think the early VA was the lightest .049..?
I'm not sure but I think the early VA was the lightest .049..?
TD ABUSER- Gold Member
- Posts : 179
Join date : 2020-11-01
Age : 68
Location : Washington
1/2A Nut- Top Poster
- Posts : 3464
Join date : 2013-10-20
Age : 60
Location : Brad in Texas
![-](https://2img.net/i/empty.gif)
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