<< I calculated the loads and came up with some interesting numbers
 on the loads of the fore and aft tubes necessary to to brace
 the landing gear. The green tubes shown in this giff.
 They are quite high so these tubes must be on the order of one inch
 OD. I really don't think they will get this high as I think
 the tire will blow and the landing gear legs will deflect to the
 point of the load at the fuselage being way less than six G's.

 BTW Ken, any RV4 mount you design must accommodate these loads and I see no
 way of doing that with any cantilevered configuration.

 Note the loads of the motor mount per se tubes are much lower when the rubber
 bushings are moved outboard (to gain clearance on the left side of
 the engine) on the motor/psru plate. The upper tubes now go directly to
 the rubber bushing gismos instead of into a truss.

 Paul Lamar

How about a plated sandwiched between the front cover and water pump to brace
an oil pan baffle plate with ears on the rear only. You could also add the
plate to the 12A front mount position to brace the ears.

Lynn E. Hanover.

That might work if you put the front cover in a mill and milled off
three quarters of an inch from the front cover face that bolts to the front
end housing. The 3/4 inch thick sandwich plate could be milled
out where the metal was not needed and to save weight.

Unfortunately all the upper load would then go through
one little 5/16th or 9 mm bolt located just under the water pump.
If you did not mind relocating the water pump it could be
made to work as some water pump bolts at the top of the front end housing
could then fasten the plate to the top of the front end housing.
Those bolts look like about 8 or 9 mm also.

I am sure that is the way Mecanair did it.

Paul Lamar

Here is another shot of the Mecanair set up.

Paul Lamar
 
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