William Munns submitted this idea :
What thickness of wood should I be looking for to support 1/2
ton, centrally from a 10' span?

Wood? I think a steel RSJ would be much more suitable as well as being
of a more predictable load bearing strength. I have no idea of the size
or how to calculate it, but obviously the deeper the RSJ, the thinner
it can be.

I would then think in terms of an A frame arrangement at either end of
the beam to support it. These would be bolted to the walls so they
can't move. What sort of walls do you have on the garage?

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Regards,
Harry (M1BYT) (L)
http://www.ukradioamateur.org