[robz71lm7]

It can be viewed here:
http://www.jegs.com/webapp/wcs/stores/serv...11919&langId=-1

Any thoughts on the effectiveness? I've never seen one up close so I can't tell a whole lot about it. I already have a Grant Formula 1 wheel and can get this lock cheap.

[robz71lm7]

Nice setup Alan.

Well doing some quick math (I must've been lazy earlier)...

For 5 10-32 socket head screws you have a total area (using root dia) of 0.094 in^2
For 6 10-32 socket head screws you have a total area (using root dia) of 0.1080 in^2

They're 144 ksi tensile as you stated.

For 3 1/4-20 socket head cap screws I have a total area of 0.0839 in^2

But they're rated for 180 ksi.

Another factor is that the three screws are inboard of the 5 or 6 so they are subjected to higher loads when the wheel trys to bend about the center.

You have four basic loads here:

1) The driver turning the wheel (torque) puts a shear force on all the screws.

2) If the driver pulls on the wheel (i.e. not strapped in properly to brace him or herself) you get a a axial load in tension on all the screws

3) #2 results in a bending moment with the lever arm being from the outside of the wheel to the center which is counteracted by the screws which are another distance out from the center- the ratio Alan stated this puts tension on some of the bolts and compression on the others

4) The screws at the base are subjected to another bending moment that's the function of the 1 or 2" spacer

This would be easier in MS Paint.

Maybe I'll get bored and do some calculations later.