I am not an engine "guru" and thus I tried something like that EXTENSIVELY couple years
ago. The results were very inconsistent. The measured force varied in too huge range of
about +/- 5-to-10 % and that is too much. I am sorry to disapoint you but there are lot
of sourses of errors in that set-up, like low-frequency vibrations which are any way transfered
to the scale-metter, of coure the high-frequency vibrations are filtered out by the connection
you make. Mechanical engineers can tell many more. At the end, after burning almost 10
liters of fuel for measurements I found out that all this was in fact quite useless because there
are simple accurate methods, lot more accurate and lot more comfortable(!!!) too than to
measure thrust - just use Measure RPM and use Calculator Program (Excel file) in your
home computer. Among several calculators I have checked, the best so far has been
the one developed by Pe Reivers and available free on
That calculator in few moments will give you at any time what you would measure and
without any dust, smoke etc and for almost any engine, propeller, fuel, altitude etc.
All my measurements converge pretty well with that calculator.