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Engine keeps breaking off (Read 238 times)
Reply #4 - Apr 18th, 2018 at 10:39pm

Sky9pilot   Offline
Stick & Tissue
Kelso, WA 98626 USA

Posts: 9536
Another option might be 1/32" or 1/16" ply epoxied to the firewall with the appropriate hole shape in the plywood.  This would make a pretty strong mount.  Would probably break the motor key off the motor before breaking the firewall.

If God is your Co-pilot...switch seats...
Your attitude will determine your altitude!- John Maxwell
And ye shall know the truth, and the truth shall set you free. Jn 8:32
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Reply #3 - Apr 16th, 2018 at 11:22am

bigrip74   Offline
What did l do this time!
Austin, Texas

Posts: 5253
I was going to suggest what Craig has, it sounds like a good idea.


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Reply #2 - Apr 15th, 2018 at 5:36pm

Balsa Bandit   Offline

Posts: 47
It can take more nose weight. In fact, subsequent to the picture, I've glued some washers on the inside of the engine piece to trim the CG forward.
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Reply #1 - Apr 15th, 2018 at 5:09pm

Craig 3   Offline
Senior Member
I Love YaBB 2.5 AE!
West Virginia, USA

Posts: 710
Maybe you could try laminating multiple sheets of thin, yet hard, balsa cross-grain (like a piece of 3/32" or 1/8" balsa plywood) & then cutting the disc from that? How does the airplane balance? Can it stand a couple extra grams of nose weight?
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Apr 15th, 2018 at 3:44pm

Balsa Bandit   Offline

Posts: 47
I'm trying to do trim flights on the Dumas Ryan M-1 I built and have a recurring problem- the engine keeps breaking off when it lands on the nose.

The Dumas kit attaches the engine with a flanged wooden disk that fits through a shaped hole in the 1st former and then locks into place with a twist. You can see it in the picture.

When the plane lands on it's nose, however, it instantly breaks that flanged disc and it's back to the building board. I don't want to fix the engine in place permanently because the hole in the center is too small to get the rubber motor through easily.

Any tips?


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