incidence of floats to the wing - RCCanada - Canada Radio Controlled Hobby Forum
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Old 02-07-2009, 09:23 PM   #1
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incidence of floats to the wing

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I am installing floats on my plane, I was told that I should install them with two degrees incidence to the wing. The wing on my plane has a flat bottom airfoil so if I put the floats parallel to the bottom on the wing that should give me two degrees….. right? Because wing incidence is taken from the farthest point of the leading edge and the lowest point of the trailingedge...... I think. Correct me if im rong.

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Old 02-07-2009, 11:22 PM   #2
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Re: incidence of floats to the wing

Yes Jon,

Very good question. Your diagram appears correct in theory according to airflow over the wing.Start there,, you can lift it another degree by shimming up the the lead edge if you need to. Check the following link to scroll through for the master article from the old RCM magazine if you wish you read more.


Last edited by cassat; 02-07-2009 at 11:31 PM.
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Old 02-09-2009, 06:41 PM   #3
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Re: incidence of floats to the wing

10 degrees is the magic number. Most airfoils produce their maximum lift around 10 deg angle of attack. What you need to strive for is when you put the model on the floor or table and push the tail down and the model is resting on the step and the rear of the float the wing angle should be between 5 and 10 degrees. Note 16 degrees is the stall angle of most airfoils. The step should be 5 to 10 degrees behind the center of gravity. Do not forget the spray rails on the inside of the front part of the float to keep the water out of the prop.

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