PPRuNe Forums - View Single Post - The Wright brothers just glided in 1903. They flew in 1908.
Old 29th May 2014, 13:15
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simplex1
 
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"- max_Thrust_propellers = 508 pounds
- Speed_plane = 70 miles/hour
- Power_engine = 40 HP

the efficiency of the propellers results as being 237%. Impossible! Case closed!"

Comment by Brian Abraham,

You got those numbers so wrong as to be laughable, and I'm not giving you the correct figures. Hint - Attend a physics lesson and learn the correct formula.
Brian Abraham, you are discrediting yourself trying to discredit me with cheap jokes!

My calculations are correct!

Here you find the formula I applied:
Propeller Performance: An introduction, by EPI Inc.

Of course I transformed the thrust from pounds to newtons, the speed from miles/hour to meters/second and the power from horsepower to watts. Of course I did not do 508*70/40 = 889! Because this is what you believe I did. You should have calculated first to convince yourself my 237% efficiency is correctly obtained, based exactly on the data provided by Gustave Whitehead, and it proves he lied about his flights on Jan. 17, 1902.

Last edited by simplex1; 29th May 2014 at 13:31.
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