Looking at the just the pictures provided in this series of posts, I didn't
see much side-to-side bracing on any of these engine mounts. Are the
expected side loads really that small?

Bill Dube'

Actually they have more side bracing than most motor mounts.
Note the distorted X in the bottom of the Mustang mount.
The current design uses a box beam instead of the hat section
shown here in this 3D.

Best to build a 1/4 scale model of your proposed design.
3/16th square balsa sticks have good scale buckling characteristics

Also read. http://www.rotaryeng.net/motor.html

Paul Lamar

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