Engine for WideBody 40
 

Hi there,
I am having trouble choosing which engine to go for. I know the plane is small, and it isn't that important a decision. Anyway, I have two engines in my stock that I can use. The Irvine 53, and the OS 46FX. The Irvine is a good bit more powerfull, but the OS is lighter. I could feel the weight difference when I swapped the engines over in my last plane.
The plane looks like it will be about 5 pounds or so, and I might add a pipe someday if I need more power, but I think that the Irvine would be the best.
So, what'll it be?
Robert.

( www.camodel.com.ar )

Sounds like a no brainer
 

Whichever engine will fit into your plane and require no nose weight is the one (or if it's nose heavy, the least amount of tail weight). I've had good luck with the OS 46FX using an APC 12X4 prop.

Engine for WideBody 40
 

If you are going to use the plane for either just 3D or just pattern, go with the .46 as it is lighter.

But If you are going to use it as a dual purpose plane, go with the .53, this way you will be able to run a higher pitched prop for pattern, but still have enough grunt for some 3D when you feel like it.

If you put a 10.5 x 6 or similar higher speed prop on the .46, it won't develop anywhere near enough static thrust for 3D, not on a 5lb plane anyway.

It is really quite amazing what difference propellor sizes make to static thrust readings.

If you use the OS, it might be worth changing the muffler from the stock one, it is only a silencer, and is not tuned. (so I am told).
Put a GMS / Tower muffler on it and it will really come alive.
ie+ 1000 rpms or so, it's louder, but worth it.

Engine for WideBody 40
 

When are we going to get some pics Robert?

Engine for WideBody 40
 

I am waiting for the big bird to arrive home, then my dad with his camera.....But it is one incredible kit, all holes, and VERY rigid.

Engine for WideBody 40
 

For what's worth, I'd put the 46 on it... the best is to keep the thing as light as u can... U can also make your flying days duble pourposed since u can change props any time u wanna shift between pattern and 3D.... I know... I know.... it's kinda odd, maybe boring thing to do, but keeps things practical for a sport plane....