Relation of Stab on Flight Characteristics
06-24-2006, 09:20 AM
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Relation of Stab on Flight Characteristics
Hi
Im trying to design a 3D model and thaught about one question...
How are the flight characteristics affected because of stab position, <up, down>. I know the further back the stab and the rudder are, the more control you get, but its CG will change a lot (its an electric).
Oh yea, and if you can refresh my memory about the wing position.
And which is better for 3D flight.
Thanks!
Ace
Im trying to design a 3D model and thaught about one question...
How are the flight characteristics affected because of stab position, <up, down>. I know the further back the stab and the rudder are, the more control you get, but its CG will change a lot (its an electric).
Oh yea, and if you can refresh my memory about the wing position.
And which is better for 3D flight.
Thanks!
Ace
06-25-2006, 10:34 PM
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RE: Relation of Stab on Flight Characteristics
The best location I have found for the stab is on the thrust line. You get the most neutral flight in that position. I have experimented with several locations. With it on the thrust line you get even preasure on the top and bottom surface of the stab.
I personaly like a wing placement that is just above the thrust line. IE edge 540 or the extra 260. Moving the rudder and stab back will not change the cg of the airplane. It will make it more dificult to balance the plane. Usually what is needed is to move the motor farther out front. Look at the layout of patern planes. They have a very long tail moment and they offset it by stretching the nose of the plane. I have found that a length that is about 95% of the wingspan works about the best. The planes that I have made with a very long tail moment were harder to wall and throw the tail around. Like in a waterfall. The reason I think is the pendulum affect of a long tail moment. It takes more effort to get a long arm to move.
Here are some pics I hope this helps.
Brent
I personaly like a wing placement that is just above the thrust line. IE edge 540 or the extra 260. Moving the rudder and stab back will not change the cg of the airplane. It will make it more dificult to balance the plane. Usually what is needed is to move the motor farther out front. Look at the layout of patern planes. They have a very long tail moment and they offset it by stretching the nose of the plane. I have found that a length that is about 95% of the wingspan works about the best. The planes that I have made with a very long tail moment were harder to wall and throw the tail around. Like in a waterfall. The reason I think is the pendulum affect of a long tail moment. It takes more effort to get a long arm to move.
Here are some pics I hope this helps.
Brent
