ORIGINAL: dick Hanson

I made my own thrust stand for small electric motors - simple and easy to use and includes a Whattmeter so that direct power input to thrust can be easly compared as it goes.
Basically using a right angle arm of equal length - the force reads directly onto a gram scale -
very simple and accurate. and cheap to make.
For big stuff - as you know, there are lots of ways to do it -
The right angle arm has NO moving parts --the arm simply pivots
force applied to say 12"-- from pivot - will be exactly the same on the right angle arm of the same length.
If I was to make one for my 200 cc stuff-- I would use a A frame made from rectangular steel sections (cheap ) and add a right angle arm -of the same stuff -triangulated for torqueing resistance.
the scale could be whatever - heck -an old feed store scale would work just fine .
(Pass me a bag of oats, Earle.)
Or ---- hi tech it -