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-   -   Adding right-thrust/down-thrust to model (https://www.rcuniverse.com/forum/kit-building-121/1386984-adding-right-thrust-down-thrust-model.html)

dwango 12-29-2003 09:29 PM
Adding right-thrust/down-thrust to model
 
I just placed an order for a CG Super Chipmunk and various accessories. Among these accessories was a one-piece pre-tapped OS engine mount for my OS FS-91 Surpass II four stroke. I've read that the Chipmunk requires some right-thrust and possibly some down-thrust. Do I have to be able to drill custom off-center holes in the engine mount to add the right-thrust, or is it set by the angle of the firewall? I'm asking because I'd cancel the OS engine mount order if its not going to be able to give me the required right-thrust (since the mount holes are pre-drilled).

TIA.

Dsegal 12-29-2003 11:13 PM
RE: Adding right-thrust/down-thrust to model
 
You don't have to mess up that nice mount. Just use shims behind the mount backplate.

phread59 12-30-2003 10:24 PM
RE: Adding right-thrust/down-thrust to model
 
Just use the firewall for right thrust and shim in the down. Use the mount, I have used predrilled mounts before. They shure do make mounting engines simpler.

Mark Shuman

rajul 12-31-2003 03:39 AM
RE: Adding right-thrust/down-thrust to model
 
ORIGINAL: dwango

I just placed an order for a CG Super Chipmunk and various accessories. Among these accessories was a one-piece pre-tapped OS engine mount for my OS FS-91 Surpass II four stroke. I've read that the Chipmunk requires some right-thrust and possibly some down-thrust. Do I have to be able to drill custom off-center holes in the engine mount to add the right-thrust, or is it set by the angle of the firewall? I'm asking because I'd cancel the OS engine mount order if its not going to be able to give me the required right-thrust (since the mount holes are pre-drilled).

TIA.
Get Ernst thrust plates. They come in 1,2, and 3 degrees. Quantum and TH carries them

MinnFlyer 12-31-2003 12:27 PM
RE: Adding right-thrust/down-thrust to model
 
I've had two of these in the past, and I mounted the engine as per the instructions with no problem at all.

apalsson 01-01-2004 03:57 AM
RE: Adding right-thrust/down-thrust to model
 
I have had a couple of Carl Goldberg Chipmunks in the past with OS91FS.

I don't recall having to add any spacers or make any modifications but just follow the instructions.
These are excellent flying planes, - like most if not all Carl Goldberg planes


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