I agree that the "depth" of this mount looks too thin just behind the
engine. The uppermost tubes are not far above the lowermost tubes. With
some sort of downward (or upward) force on the engine CG, these tubes
would be under a lot of compression and tension.

    Also, the lower tubes look _REALLY_ long. They don't have any sort
of brace in the center. Again, with a downward force on the engine,
these tubes might well buckle. What exacerbates this is that they might
also be subjected to bending as the engine flexes downward.

    It may be the perspective in the picture, but this mount looks like
trouble to me as well.

    If you are emotionally attached to this mount, and aren't willing to
give it up just on the speculation of others, you should at least proof
load it downward. This would not be terribly difficult to do.

    Bill D.

Thanks Bill. I particularly like the "emotionally attached"
part. :)

Paul Lamar


Paul, Bill,


Thanks for the input. I do know a couple of very talented ME's here in
Austin that came out of the UT think tank a few years back. I will have
one of them run an analysis using the tube specifications, angles and
weights. It may be a few weeks since these guys are involved in one of a
kind projects for some major companies involving robotics, etc. I will
let the group know one way or the other what the estimates are. I am
emotionally attached enough to the mount that I will not do destructive
testing :) One of the engineers is also a pilot so after his analysis I
see if he would fly it.

This mount was made a little different than Freds other mounts because
of the complexity of the RV10 noise wheel. If modification are required
they will be done before flight.

Bobby

Bobby (or anybody else building an RV10) what is the vertical
position of the thrust line relative to the top motor mount
hard points on the firewall. Also as a double check what
is the distance between those two hard points?

Paul Lamar

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