Looks great Perry. No problem with four 1/4 inch bolts in
single shear. Each single shear bolt location will take in
theory 7,000 pounds at 150,000 psi.

Paul Lamar

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Correct Paul, to be exact it's 7,363lbs...Of Tension, however in a Shear
application one should figure on 60% of that (4,418lbs.)

I did not know that Butch. Major gap in my self taught mechanical
engineering education. Why? What is the theory?

Perry, you could get away with thinner side plates.
Each bolt joint is only subjected to 900# / 4 or
about 225 pounds at six G's assuming this mounts
took half the 1800 pound vertical G load.

The 1/4" bolt bearing stress for a 3/16 thick steel plate would be
only about 4800 psi. Not high. Even for aluminum.
You could save a bit of weight by going down to .090 4130.

Not much in terms of actual pounds saved so it is not really
very important. It is not a bad thing to over design small brackets
like this. Unless of course you are designing 747's and there
are thousands of brackets :)

Paul Lamar

OK, maybe I'll use 1/8".  This bracket can be used
by anyone who might want to use the stock 2nd gen mount
points.  Not restricted to just the LEZ.

Perry

 
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