engine mount question
 

I have to modify my engine mount on the used telemaster that I have. The current mount is too wide to fit my os 60 engine. I was thinking of bolting a piece of plywood to the current mounts on the plane and make new mounts on the plywood. what thickness of plywood should I use? would this work?

Thanks

Jon

P.S. how good of servos are Futabas fp s28?

RE: engine mount question
 

There is no problem using at least 1/4 inch thick plywood (Aircraft type) but you should also check the tank alignment to avoid running your engine lean.

RE: engine mount question
 

Thanks, that is a good point on engine alignment

RE: engine mount question
 

Wouldn't be cheaper and easier to just get one of those adjustable engine mount ?

RE: engine mount question
 

I guess that I did not tell about the current engine mounting system. It is currently 2 hardwood blocks glued to the side of the fusalage and firewall, I don't want to try to pull that stuff off and remount it.

Thanks

Jon

RE: engine mount question
 

As already stated 1/4 is fine also there is plenty of room in the tank compartment and raising the tank slightly to maintain the tank/venturi Spraybar relationship is not problem.

One caution though if you use plywood, do not use common three ply or lite ply. Suggest you use only modeling birch seven ply or better.

John

RE: engine mount question
 

Minnreefer, i too have just experienced the same problem as you in my Excelleron90. I am fitting a Saito 125. So this is what i have done. I used 3/16" Aluminum plate cut to fit the full length of the wooden rails. I sat them in place while i marked where to drill for the motor mounting. Now instead of drilling to suit the mounting screws, i drilled a smaller hole and tapped the aluminum to suit 4 mm hex head screws. With holes drilled and tapped i mounted the engine to these rails, then fitted the assembly to the wooden rails. Now i drilled 3 holes in the aluminum to take wood screws, {that is 3 holes per side} , to hold the motor firmly on the wooden rails. It works excellently, with little change to the CG. Another good thing is the mount will never get soaked in oil. I must add that i did seal the original wooden mount with super glue to prevent oil soaking into the wood.
Hope this helps you too, as it works wonderful in my model.
Bill

RE: engine mount question
 

Aluminum would have been a great idea, I just bought my plywood yesterday, and I will probably jsut get it done. There are a lot of little things that I want to redo on that plane, I may just abuse it this summer and totally redo it next winter.

RE: engine mount question
 

Might I suggest you pin the ply to the hardwood with dowel rod when you epoxy it.

David

RE: engine mount question
 

If it were me, I'd just epoxy a basswood block to the inside of each rail. Make them as wide as they need to be to fill the gap, then just bolt the engine to them. This way you're not changing the height of the tank (Although tank-wise, you'll never notice a 1/4" difference in height anyway)