Thrust bench

by Tiktiki Jul 18, 2016
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i need to modify some things. can you share the original 3D files please ?

Unfortunately I don't have the files anymore. This was done quickly to solve a problem a few years ago.

ok, i reworked stl directly, not the best but i think that is good, need to print for check.

after i upload all :)

Is there any calculation factor for using different tube length? Normally both tubes must have the same length for measuring the 1:1 thrust. For bigger propellers (16" and up) you need very long tubes. In this case you need the same length to the scale - but then the Thrust stand become very big.

A shorter tube to the scale would be nice, but the result is wrong. Is there any calculation factor for length propeller tube <-> scale tube?

It literally is a simple ratio.

Say your vertical is 1.986 times longer (be as precise as possible, that is why the resting "ring" is not to be glued/fixed.
Multiply the reading on your scale by that ratio.

For example a reading of 2.395kg with the ratio above would mean an actual thurst of 4.756kg.

Don't forget that you have to measure from the center of your motor shaft to the center of the pivot shaft down at the block.
Similarly, you should set the height to be just over perfect level and measure the bottom tube from the pivot shaft center to the outside edge of the ring (that is the corner that will make contact). It's not meant to be a high-precision rig, but give a pretty good idea of the static thrust you can get with your setup.