Thanks Eric.

I figured you had NC machines so a billet approach would be the easiest
thing to do. Most of the Mazda mounts use a welded beam. I figure it is going
to weigh about 4 pounds. The two front bushings are at about the CG of the
engine, gearbox and prop. Consequently they will take most of the inertia
load and of course the peak torque reaction load from the prop which can
be in the case of the one rotor as much as 400 foot pounds. Depending
on the gear ratio of the PSRU. I use an inertia load factor of 6 G's to be on
the save side when designing motor mount. This will handle a botched
landing and minor crashes. Long term it would save some weight if this
was designed into the end housings. A wider spacing of the motor mounting
bolts is called for. Particularly the front ones.

Paul


Paul,

Not a big deal on this one I wanted to be careful until we had something we
thought was presentable. The fact is you came right out of the box with a
nice looking and I am sure structurally sound recommendation.

No harm done In fact the models probably had some people thinking about how
that would fit in their own engine compartment.

Thanks for your help.

We are ready to fly the Sparrow hawk I believe next week. And we have a LSA
craft that will be flying in the next few weeks I will keep you posted.

Eric Barger