That is exactly what the calculators are for. + if you have a good one, make a decent speed estimate of your plane.
My calculator for example calculated the Spitfire prototype top speed only 4 mph too low. The sundowner using prop and rpm data provided by Ralph was spot on in top speed calculations (checked by radar gun).
I think this also answers JAKA's argument as to the uselessness of static thrust only. Indeed, a good calculator must go one step beyond that.

Whilst my calculator is based on quite general prop formulae and on NACA publications plus some educated guesses plus field report feedback, Umran's work may turn out to be very valuable for us model pilots, either by providing scientific verification of observations, or by providing extra calculation confidence base. As a mechanical engineer, this is beyond my scope of education, so I hope for some synergetic results.