Paul,
My Renesis has been moved forward 8" on my RV10. As a result I have 15"
between the pulleys and the firewall. Studying high pressure areas on
aircraft there seems to be almost as much high pressure at the base of
the windscreen as on the nose of the plane. I was wondering if this area
could be used to feed a radiator. Any experience with this method in
race cars?
Bobby
I am going to be brutally frank. DO NOT ATTEMPT TO FLY WITH
THAT MOTOR MOUNT. If you bought it... DEMAND your money back!
Motor mounts are subjected to 6 G's vertical load.
Since the engine PSRU prop and all accessories add up to
close to 300 pounds and the Cg of the combination is near
the rear (in the car) end housing there is a 1800 pound down
load on the end of this mount. I guarantee it will bend or worse
case break. If you wish to verify this you can try
to pick up the front of a 3000 pound car using this
motor mount static test diagram. The top and bottom
diagonal tubes MUST intersect this CG point in the
vertical plain.
snips.....
Paul Lamar ...No rotor no motor.
Paul
You have me concerned. I ordered a CSI mount for a Cozy and a Renesis.
http://www.conversionconcepts.com/cozymk-iv.htm It has been on order
for nearly one year and I was told it is being shipped next week. I am
anxious to see it. What is your opinion on the construction of this
mount?
Rick Irwin
If it is NOT extended way aft and the lower tubes have a
substantial angle down and back to the firewall they are barely
adequate. I don't think the mount above was made by
Conversion Concepts but I could be wrong. At least it does not
look like a CCI motor plate.
Here is a chart that illustrates the problem.
What you have in effect with a CCI mount is a virtual
firewall where the top tube becomes horizontal. Start
calculating the loads from there.
For more info read the motor mount section on our web site.
http://www.rotaryeng.net/motor.html
------------------------------------------------------------------------
Bobby,
Send some more pictures of this mount. Preferably a straight-on view
from the side. Also a detail shot of the vibration pads. Paul is
correct, this mount is not adequate, yet. It may be OK with the
addition of a tube on each side from the upper firewall mount to the
front engine mount pad. I can't see enough from your picture to make a
judgment about the lateral strength.
With this mount you would also need to do a study of the loads during a
hard landing where there would be landing gear loading and g-loading
from the engine.
Aubrey
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