Originally Posted by
All Day Dan
That's one long cantilever you have there. All those lightening holes, lite plywood and no gussets add up to a weak structure. Add the weight of the motor and torque from the prop it's no surprise you experienced your problem. As a last resort you may want to consider beefing up the structure with some aircraft plywood, hard wood triangular stock and plenty of epoxy. Dan.
Yup, structural reinforcement seems to be the answer.
Thanks!