Mark, I would have to agree the inertia dyno would not give a true representation of what a motor will do in a race. One of the sites listed by Lohring stated that inertia dyno's were ideal for carting as acceleration was more relevant to the application - where as brake type dyno's are more for WOT type runs with little or no fluctuations in throttle position. To me that sounds just like what our motors do during oval racing. As long as you can launch the thing from the shore then peak power at WOT would be what I think would be more desirable.I am a little undecided on the inertia dyno setup because it only measures accelaration not constant running at high speed which is what a rigger does. This means it doesn't measure the effects that creep in with rising temperature.
If I am incorrect please let me know.
At the moment I think for model boat racing a steady state dyno would be the best set-up.
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