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  #1  
Old 03-23-2012, 10:37 PM
yesbee1 yesbee1 is offline
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Knife edge maneuver drops altitude

Hi All,
I have watched the Knifeedge Knife edge maneuver tutorial countelss times and was trying to do it with the delivered Yak-54 plane.
Whenever I bank to 90 degrees and smooth the rudder in the plane stays in the same bank but loses altitude vertically. Could anyone shed light on what I could be doing wrong?


Thanks.
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Old 03-23-2012, 10:38 PM
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I always move the rudder in the direction of the upper wing in a knifeedge.
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  #3  
Old 03-23-2012, 11:25 PM
yesbee1 yesbee1 is offline
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Yes. Doing the same thing (rudder opposite to initial aileron). Like I said plane stays in the knife edge attitude but loses altitude (i.e. descends vertically).
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Old 03-23-2012, 11:56 PM
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Not using enough then or not going fast enough.
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Old 03-24-2012, 01:00 AM
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Increase Dual Rates -_- that's a usual need
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Old 03-24-2012, 02:20 PM
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opjose opjose is offline
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AND go fast enough.

The wings are not developing lift, so the only things keeping the plane in the air during a knife edge are any vertical vectors from the angle of the motor/prop AND what little effect the fuselage has on lift.

The fuselage acts as a big but very ineffective airfoil during knife edge flight.

So you have to keep the nose pointed slightly up to let the fuselage get the proper angle of attack, and also to let the prop impart some vertical lifting force.

What you are experiencing is what a real plane does.

Knife Edges and rolling turns look easy, until you try to do it yourself and realize that there is more too it than meets the eye.
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Old 03-25-2012, 12:11 AM
yesbee1 yesbee1 is offline
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Thanks for all the suggestions. What I found is I am giving the rudder just a moment late. If I start giving a significant amount of rudder as soon as roll starts, the plane is able to sustain knife edge without losing altitude.

Thanks.
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Old 03-25-2012, 08:30 PM
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Now try a knife edge rolling circle.

I STILL can't get the timing right...
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Old 03-25-2012, 08:39 PM
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This is the way the old Geaser does it.
http://www.youtube.com/watch?v=YXTutzulSb4
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Old 03-26-2012, 12:06 PM
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That makes it look SOOOO easy....

People not into RC have no appreciation for the pilot's skills.

Torq rolls and canopy out hover moves in all directions I can do just fine...

Rolling knife edge circles like that, not so much...
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