L-36.com

Jib Turning Block Calculator


This page relies on this math, a little trig, and a lot of programming.
by Allen Edwards
2/16/2008
Use at your own risk. It has been debugges but may stil have errors. The bright side is that it doesn't matter that much as you can adjust it when fitting it by putting the lines on and alighning it for a good lead angle. As of this date, I have checked all the sections with a variety of test cases.
Allen
Use this table to enter the locations of the three components of the jib sheet system. The X axis is aligned with the axis of the turning block in that the long axis of the physical block will end up pointing down the X axis. What I did was make measurements on deck, then rotate those measurements to align the block the way I wanted. There is a section at the bottom to make the rotation calculations. To get the sheet angle where you want it, you can play with the spacing from winch to turning block and the block height. Be sure to check the pad heights so they are not too low, or even under the deck, and not too high so you can't get bolts long enough.
X Y Z
Winch
Car
Turning Block
Input the diameter of the Shieve:

Enter values above. Note that if you end up dividing by zero, this will crash the page. I recommend you try an example HERE then modify it to your situation.


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