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For an eye bolt or even a pivoting lifting ring that is correct. The reduction is the angle from horizontal/percent reduction is well known for those working with lifting slings:
60º / 35%
45º / 70%
30º / 75%
Again, let's not lose the sight that we're dealing with a 60lb or so engine head and go deep in the weeds.
I’m glad it worked. As crazy as some of the things I do look, I’ll never post anything I haven’t tried or checked out.
In this case, I calculated the strength of the material in tension before I physically tried the clamp on my heads. When I pulled the motor using some scrap 8020, I tested the functionality at the farm. 8020 also has calculators on their site, and I used them too. The 8020 profile is a complex one to calculate.
I never, never show something I haven’t verified or done in public.
Fabricating the bracket is fine if that’s something someone wants to do. Far be it for me to stop them. I just like to do things in the simplest, cheaper way, unless I really, really have to. Then I’ll go full bore.
I tested one rail for almost the full weight of the complete motor. Twin rails, easy. Four bolts, one 2,000lb lifting eye.
Going back in I built a bracket. The 8020 left it a little nose heavy.
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