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Old Mar 26, 2002, 03:19 AM
Registered User
Hervey Bay, Sunny Qld, Australia
Joined Jun 2001
1,774 Posts
motor, wing and tailplane incidence

Hi
This is probably the most asked question ever, but I have been looking at a few sp400 designs for pylon models and some sport model and have noticed that the wing incidence and tailplane incidence are both 0 degrees and the motor has no down thrust or any offset to the right. I have always made the wing in my own models at a 2-3 + incidence with the tailplane at 0 degrees, with the motor with 3 degrees down thrust and 1.5 - 2 degrees right offset.
The reason that I'm curious about this (and not disputing it) is because that I'm in the process of making my own pylon model (speedster) and if 0 - 0 incidence for both the wing and tailplane (with a 0 downthrust and offset for the motor as well), is correct and works, then I'm happy to give it a go.
Oh by the way I'm using a MH 43 airfoil as well if that helps with this enquiry. And a flat plank V tailplane (for simplicity)

Later
G
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Old Mar 26, 2002, 08:57 AM
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Canada, NS, Lunenburg
Joined Oct 1999
3,869 Posts
Pylon models generally fly straight and level with the wing at a very low angle of attack. The camber in the airfoil is sufficient to provide the necessary lift with the wing at 0 degrees. At high speeds, a very low CL is required. Consequently, no downthrust is required to offset excess lift. A 0-0-0 setup also has the lowest drag.

Pylon models are set up to be neutrally stable in roll. Bank them to a knife edge and centre the ailerons and they will stay banked. Side thrust destroys this neutral behaviour so is not desirable.
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Old Mar 26, 2002, 05:22 PM
Registered User
Hervey Bay, Sunny Qld, Australia
Joined Jun 2001
1,774 Posts
Thank you

Thanks Dave and Jonas (for the email). I had a feeling that it was something to do with aerodynamic and speed. Actually when I went to bed last night I read an article about down thrust and right offset, and found out that with a small prop there is no need for off set as the force is too small to worry about.

Thanks again
G
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