I have the JetCat engine mount for a P 80 to fit the Kangaroo. It is standard one that is screwed to the fuselage and the hoop clamps the engine.

When I tighten the bolts on the hoop it pushes the engine down hard onto the head of the screws that are holding the clamp to the fus. This is resulting in dents in the engine case.

How can I stop this? Is there something I can put in between the engine and the screws to prevent further damage? Is there a better engine mount available?

Thanks

I did two things to address this. First, I used flat head wood screws to hold the engine mount on and I slightly countersunk them into the aluminum bracket, and second, I put a couple of pieces of foam mounting tape over the screw heads. This greatly reduced the marking of the case, although you can still see where it was clamped in. The external case on the Jetcats is cosmetic, by the way.

Bob

I did the same method as Bob and counter sunk wood screws. I place two layers of Kevlar cloth between the mount and engine case.

What the folks at Jetcat told me to do is:

1) Countersink the tapped holes in the Kangaroo, most of the c'sink will be in the gellcoat, screw head should be flush to just below.

2) Make a wood block with the same mounting hole pattern but with minimal clearance for the flat head screws, and countersink them.

3) Place the flat head screws though the mount and into the holes in the block.

4) Place a screwdriver in the screw head and hit it with a hammer. test the fit of the screw to the holes and the extrusion to the Kangroo

this extrudes the mount into the hole. if depth were correct all 4 screws will be just below flush.

Adjustments:
a second hit with the hammer may be needed for deepening the extrusion
countersinking the holes deeper in the wood block & goto step 4
countersinking the holes deeper in the Kangaroo

This process will not reduces the wall thickness of the mount

use new screws for intallation. toss the forming screws away

bob E

Those canards are cool on your roo, total improvement on how the bird flys, I wish I had the room to do it.