I have gone to some of the blade designs and profiles of the blade which suits my requirement. But, once after entering the Theoretical calculation, I was stuck in the determination or the Justification for the Magnitude of Pitch mentioned in the Blade.

Example: I have taken the propeller of size 10 inch and 4.5-inch pitch value, Some blogs suggested to have a pitch of 0.2 times of the propeller dia for stable and efficient flight. But they didn't reveal how it affected the efficiency or why they stated those values...?

  • $\begingroup$ Could you add the references to "Justification for the Magnitude of Pitch" or "Blade". Do they refer to some common terminology among hobby-builders. $\endgroup$ Commented Jun 19, 2020 at 20:24
  • $\begingroup$ robu.in/product/… I have mentioned the link for the chosen propeller and in this, they have specified the pitch of 4.5 inches and I want to know how they found it out $\endgroup$ Commented Jul 1, 2020 at 7:42

1 Answer 1


Not long ago I had the same problem of evaluating different blade designs. Well it's not an easy task. I used JavaProp which is a tool for evaluating propeller designs. The author has an phd in aerdynamics so I guess the tool works properly. It allows you to caluclate the efficency depending on the pitch angles, altitude, cruising speed, rpm, motor torque etc.

  • $\begingroup$ I have seen the reference you have mentioned, but the article is mainly focused on the ship propellers and jet aircrafts $\endgroup$ Commented Jul 1, 2020 at 9:51
  • $\begingroup$ With the tool I mentioned, you can evaluate airscrews in general . The way they generate thrust is independant of the angle of attack. Have a look at VTOL aircrafts. I agree that there is a difference between aero and hydrodynamics, but the working peinciple is the same. As an extra option you can evaluate turbofans which are a special case of airscrews / Propellers $\endgroup$
    – Westranger
    Commented Jul 1, 2020 at 11:25

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