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Handling Changes with Dihedral Removal

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Old 07-03-2018, 11:03 AM
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Ozzy37
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Default Handling Changes with Dihedral Removal

Hey All,

Wife and I have a question for you.

We are building a Great Planes PT-40 kit together and were wondering other than losing some of the self correcting properties, is there a downside to removing the Dihedral in the wing?? I think there might actually be some benefits to removing it. Let us know your thoughts.

Oz
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Old 07-03-2018, 03:15 PM
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R8893
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Reducing the dihedral will reduce the amount of roll the rudder produces, and make the ailerons more effective.
Chuck
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Old 07-03-2018, 05:48 PM
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52larry52
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Ozzy37, Depending on your flying level and your intentions with the PT-40 you might not want to remove all of the dihedral, just reduce the amount. I would leave about 3/4" to 1" at each wing tip, but that's just I would do.
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Old 07-03-2018, 06:31 PM
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I agree with leaving a bit of the dihedral. Airplanes of this type just look more normal with some dihedral.
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Old 07-03-2018, 06:55 PM
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Even with no dihedral there will always be some self righting tendency from a high wing configuration. Pendulum effect of all the weight hanging below the wing. We have removed the dihedral from more than a few trainers without any problems. If your going to do this I assume its for a little more performance. Then increase the area of the ailerons and elevator 50% and double the area of the rudder. People do not notice the changes at first glance but crisp stall turns, knife edges, clean snaps and spins sure get their attention.
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