Engine Mount - side wall
 

I glued the side sections to the fire wall as per the instructions. I'm using a great planes engine mount for a super tiger 40. I expected to have a small gap between the mount and the fuselage sides, but there is next to none. Some older designs had a maple or plywood engine rails with glued to the fuselage sides and had some of the vibration absorbed by the fuselage. Could I expect some vibration problems with the current setup or I shouldn't worry about it.

RE: Engine Mount - side wall
 

Yes, a setup like that may transfer a lot of vibrations to the fuselage sides. What I would do with a setup like that is simply remove the engine mount and sand the insides of the fuselage sides. Sand it down so that you have ~1/16"-1/8" clearance on both sides of the mount. The fuselage sides look to be thick enough that you can sand away that much material with no problems at all.

Hope this helps

Ken

RE: Engine Mount - side wall
 

Thanks Ken, that's what I thought would happen. The kit was designed for have the outer side of the walls sanded to give a gentle curve to the nose.

1/8" is a lot to sand off, so I cut the sides back with a Vaughan Bear Saw BS150D, (Rona or Home Depot). Produced a nice controlled cut. One side came off at the fire wall (exhaust side) anyway so I'm gluing on a new piece. I had to open up the side to clear the manifold. Clamped the new piece in place, and reglued with 30 minute epoxy.



Jim