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Rubber power problem

Rubber motor twisting the fuselage

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Stuart Coyne16/10/2019 23:24:08
2 forum posts

Having recently built a KK Ace with reasonable success I thought I’d have a go at the Senator. With the ace, I threaded the primed rubber motor after covering the model with tissue. Not fun! Much cursing etc. With the Senator, I was clever. I thought I’m going to thread the motor before covering. That way I can get my fingers in the fuselage and pull it through. Why has no one else thought of this? Then I fitted the tail plane and wondered why it was lopsided. Not just a little. The left tip was about an inch lower than the right. Took the rail plane off and viewed the model from the front. It looked like a cork screw. Wa at his because of my brain wave of threading the motor before covering? Will covering the fuselage provide any stiffness? Is my model destined to crash and burn?

Dickw17/10/2019 11:05:08
480 forum posts
76 photos

"Will covering the fuselage privide any stiffness?"

Yes - the doped tissue covering is what provides most of the stiffness - the frame is just there to hold it in place.

Changing and replacing the rubber was normal, so installing the rubber before covering was never considered an option.


brokenenglish17/10/2019 12:15:44
464 forum posts
29 photos

Both the Ace and Senator plans clearly tell you to leave an open bay in the covering, immediately behind the rear motor peg, to allow easy access and loading of the motor, etc.

On competition models, it's possible to load the motor without the rear access, but you need to make up a special "tool" (a long dowel with a specific type of "fork" on the end), and this obviously isn't worth the trouble on beginners' type models.

My own suggestion would be to avoid "fancy tricks" and do it the way it's shown on the plan.

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