>
>
>>I have attached (I hope it comes through!) a rough sketch
>>illustrating the principle.
>Can you (or anyone else) offer an explanation of why the 90-degree
>geometry works?
Apologies for replying to my own post, but the penny has finally dropped!
Consider (as they say in all the best textbooks) a virtual lever
going diagonally from the handle end of the torque wrench to the
centre of the prop bolt. This will be longer than the actual torque
wrench, but the component of force effective at right angles to its
axis will be smaller than the force exerted by the operator, in the
exact proportion required to apply the required torque to the prop
bolt.
All I had to do was remember that the torque-wrench & spanner
assembly is a rigid body (at least until the torque wrench clicks)
and sketch the components of the operator force. Sorry to be so slow
on the uptake, and apologies, Svein, for casting doubt on your
suggestion!
regards
Rowland
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| Rowland Carson PFA #16532 http://home.clara.net/rowil/aviation/
| 750 hours building Europa #435 G-ROWI e-mail <rowil@clara.net>
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