Weed eater/whacker engine conversion to 1/4 scale piper cub.

[Matthewdupreez]

hi guys so this thread is my journey on converting a weed eater/whacker engine to fit on a 1/4 scale piper cub.
some of the things I am currently trying to do are.
- find a way to seal foam so it does not disappear when in contact with fuel.
- find a 35cc or bigger bush cutter engine.(chainsaw would also work)
- build a 1/4 scale piper cub from dowel rods, aluminium angle "iron", ply wood, and foam board. EDIT.. AND COROPLAST/CORAX/

if any of yall can give me any ideas I would much appreciate it.

thanks to @SquirrelTail I have a fair idea of what I want.

 

[Merv]

I would first start with an engine made for a plane, like the one below. There are many sizes and brands to chose from.
You'll have a lot of machining to make a weed eater or chain saw engine fit on a plane. Why reinvent the wheal?

Stinger 20cc gasoline engine 2 cycle piston value type re(rear exhaust)/se(side exhaust) 6-14v 1500-105000rpm support 1410 1508 1606 1608 1706 14/15/16/17 inch prop for rc airplane fixed-wing Sale - Banggood.com

 

[Matthewdupreez]

I would first start with an engine made for a plane, like the one below. There are many sizes and brands to chose from.
You'll have a lot of machining to make a weed eater or chain saw engine fit on a plane. Why reinvent the wheal?

Stinger 20cc gasoline engine 2 cycle piston value type re(rear exhaust)/se(side exhaust) 6-14v 1500-105000rpm support 1410 1508 1606 1608 1706 14/15/16/17 inch prop for rc airplane fixed-wing Sale - Banggood.com

fact #1, i can not afford a proper rc engine.
fact #2, people have been trying to discourage me from doing this. so to prove them wrong i will do it

 

[Matthewdupreez]

and that engine will cost me 4000 rand, i can get a weed eater for 100 rand

 

[Merv]

It is certainly possible to take a weed eater or chainsaw motor & put it on a plane, many have done it. I do not want to discourage you but It's not an easy process. You will need a lot of milling and fabricating to make it work.

 

[Matthewdupreez]

It is certainly possible to take a weed eater or chainsaw motor & put it on a plane, many have done it. I do not want to discourage you but It's not an easy process. You will need a lot of milling and fabricating to make it work.

well i'm a diy kinda guy so i am fine with that

 

[Apis]

I say do it! Document the process though.

 

[Matthewdupreez]

I say do it! Document the process though.

I am going to do it and document it... no one else has documented it really well....
just trying to find a motor to use...snooping around ya know.... can't build the plane until I know what sized one I can use

 

[chrisvdv]

@ Matthewdupreez GOOGLE.

Ru still on your way to NZ?

 

[Matthewdupreez]

Ru still on your way to NZ?

we are still trying to get there.... it is not a short process.

@ Matthewdupreez GOOGLE.

yea but there are not really any thorough documentation's of the entire process.

 

[chrisvdv]

Take a look
http://www.rcfaq.com/ANSWERS/ENGINES/Poulan46/POULAN46c.HTM

 

[leaded50]

they have used weed whacker motors, chanisaw eg. in RC cars in many years, why not in planes? As the link from @chrisvdv shows. !!

 

[Matthewdupreez]

check this out...
@leaded50
@chrisvdv
@dh04000
@Merv
@SquirrelTail
https://drive.google.com/file/d/1u3fK3eN84nbuGbAO6KywaanIrg153Wa-/view?usp=sharing

 

[Merv]

check this out...

Looks like you are making progress
All you need to do now is attach a prop & mount the engine on a plane.

 

[Matthewdupreez]

Looks like you are making progress
All you need to do now is attach a prop & mount the engine on a plane.

+build the plane.
+ make the motor lighter.
+order a prop.
+collect the chainsaw engine... i would rather use the brush cutter. but it is in perfect condition... and idk why the guy gave me it for free saying that the clutch was slipping...
+and reassemble the chainsaw engine... apparently it is in parts.... i hope the chainsaw is in parts not the engine.... but i guess they are rather simple engines..
+do school that ends at 3.30pm in the afternoon

 

[Matthewdupreez]

@Graeme M did you say you have made a weedeater plane?

 

[Bricks]

@Graeme M did you say you have made a weedeater plane?

Has a big prop and short landing gear....

 

[Matthewdupreez]

Has a big prop and short landing gear....

@Bricks i don't really understand... What do you mean?

 

[Taildragger]

@Bricks i don't really understand... What do you mean?

Big prop short landing gear. The edge of the prop is close to the ground, might get propstrike on landing.

 

[Matthewdupreez]

Big prop short landing gear. The edge of the prop is close to the ground, might get propstrike on landing.

nonsense... if you are talking about the cub i'm gonna build i won't have that problem