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max effective rudder throw?
What max rudder throws are folks using for F3A? I'm just setting up my new plane, and to me it seems there would be some point at which more throw isn't doing you any good, just adding drag and creating weird coupling. 45' seems like a reasonable place to start, but is it a case of severely diminishing returns after say 30' or is it important up to 60'? Has anyone done any testing on this?
The underlying reason for the question is two fold. One, physically, I have just over 30 degrees throw as it sits, but can easily add more to the fin TE or rudder LE to get more throw. Second, I want to set the linkage for max resolution so I'd like to set the trade-off between resolution and leverage properly. Wasting resolution/leverage achieving throw that I don't need doesn't make sense. Any advice on effective max throws welcome! Wayne Powell |
RE: max effective rudder throw?
I cannot say from experience, but I have a book by Dave Patrick, who claims 35 degrees is the max effective rudder throw before you get the drag and coupling problems. I also wonder if it depends upon the specific plane's design.
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RE: max effective rudder throw?
35 degrees works for me, although I know of some that will use 45 for stall turns especially with the small rudders of the European models. I tried 45 out on the Enigma but didnt feel it was any better than 35.
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RE: max effective rudder throw?
Different courses for different horses.
It's not easy to give a general recommendation but above say 35 - 45 degrees deflection, you are most likely producing more drag than yaw. In general I would recommend to use the smallest possible throws that takes you through your program of choice with some margin. /Red B. |
RE: max effective rudder throw?
The Impact on 20 degrees of rudder throw flies easier knife edges, slow rolls, and the higher speed maneuvers. It needs at least 30 degrees to perform the slower maneuvers such as snaps, spins and stalls better. This model has generous lateral area around the CG which enhances rudder effectiveness, so you may want to judge accordingly, depending on your model's specifications.
MattK ORIGINAL: falconhob What max rudder throws are folks using for F3A? I'm just setting up my new plane, and to me it seems there would be some point at which more throw isn't doing you any good, just adding drag and creating weird coupling. 45' seems like a reasonable place to start, but is it a case of severely diminishing returns after say 30' or is it important up to 60'? Has anyone done any testing on this? The underlying reason for the question is two fold. One, physically, I have just over 30 degrees throw as it sits, but can easily add more to the fin TE or rudder LE to get more throw. Second, I want to set the linkage for max resolution so I'd like to set the trade-off between resolution and leverage properly. Wasting resolution/leverage achieving throw that I don't need doesn't make sense. Any advice on effective max throws welcome! Wayne Powell |
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