

Oct 18, 2004, 10:33 AM  

http://www.lcrcc.net/thrust_calc.htm
or read the the thread on "How do YOU measure thrust" http://www.rcgroups.com/forums/showthread.php?t=286867 
Apr 13, 2014, 08:53 PM  
Joined Dec 2010
222 Posts

Quote:
Here is the simplified version of my equation: F = 4.3924e8*RPM*d^3.5/sqrt(pitch)*(4.23333e4*RPM*pitch – Vac). F is thrust in Newtons, RPM is rotations per minute, d is prop. diameter in inches, pitch is prop. pitch in inches, Vac is aircraft airspeed in m/s. If you want thrust in other units: to convert newtons to grams, multiply newtons by 1000/9.81. To then convert grams to ounces, multiply grams by 0.035274. To convert ounces to pounds, divide ounces by 16. The generics of the equation can be found here, including an Excel spreadsheet to make your life easier, and the equation above is shown here in a more visually appealing form: http://electricrcaircraftguy.blogspo...equation.html The full derivation of the equation begins with Newton’s laws, and is shown here: http://electricrcaircraftguy.blogspo...ackground.html I hope this is useful to many people, as it is very useful to me. 

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