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Old Feb 15, 2013, 10:42 PM
Registered User
United States, ID, Burley
Joined Mar 2012
3,282 Posts
Help!
three channel control

Okay a buddy built a 3 channel power glider all balsa, rudder,throttle,elevator. He has put rudder on the right side with elevator,so the question is this. When turning with rudder only how do you keep wings level so it doesn't tip to one side ??
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Old Feb 15, 2013, 11:38 PM
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C₄H₁₀'s Avatar
United States, AK, Fairbanks
Joined Aug 2009
12,371 Posts
Quote:
When turning with rudder only how do you keep wings level so it doesn't tip to one side ??
You don't. Tipping to one side is rolling, just like with ailerons. It's what actually turns the plane; the rudder induces a yaw motion which is translated to a roll by the wing's dihedral.

If the plane is tipping AWAY from the direction of the turn, however, then the plane needs a bit of rethinking - or ailerons.
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Old Feb 15, 2013, 11:53 PM
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Lnagel's Avatar
Moab, Utah, USA
Joined Apr 2003
5,674 Posts
With no ailerons, if the wing has any amount of dihedral you can't. The airplane will always roll in the direction of rudder input. But that is exactly what you want it to do. A banked turn is a lot more efficient than a flat, wings level turn. With a banked turn the airplane will lose a lot less energy.

Larry
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Old Feb 16, 2013, 03:00 AM
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United Kingdom, England, Bristol
Joined Aug 2009
973 Posts
And... when you turn on rudder, the dihedral allows the model to bank a little (helping the turn) but the inside wing on the turn will be near enough flat and providing lift where a non-dihedral wing would be spilling the air from under it, thus requiring elevator to make the banked model turn. Steering is always on the right stick (mode2) so 3ch it's the rudder, 4ch it's ailerons. The rudder becomes secondary on a 4ch model, used more for scale turns or aerobatics
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Old Feb 16, 2013, 01:24 PM
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United States, ID, Burley
Joined Mar 2012
3,282 Posts
thanks gents ! Makes sense we will fly the maiden as soon as wind dies down.
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