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Model Forum / Radio Controlled / Air Models / August 2004Thrust
t On a Sig 4-star 40 kit the fire wall is marked with a thrust line. How important is the horizontal thrust line. I want to know if I can lower the engine about 1/2 inch. Thanks. I wouldn't recommend it.... The 4*40 has very little roll coupling in yaw, and changing the thrust line could have a negative effect on this.. Bill > t On a Sig 4-star 40 kit the fire wall is marked with a thrust line. How > important is the horizontal thrust line. I want to know if I can lower > the engine about 1/2 inch. > Thanks. > I want to know if I can lower >the engine about 1/2 inch. Changing the thrust line MIGHT affect the axiality of the rolls, but unless you're doing precision aerobatics, who cares? On the other hand, if lowering the thrust line may make your engine run better, thus preventing an untimely flame-out, then by all means, go for it! Dr.1 Driver "There's a Hun in the sun!" It's an easy enough thing to test out. The plane won't be uncontrollable with the thrust line moved 1/2" down. Try it both ways to see which you like it best. Wiz > t On a Sig 4-star 40 kit the fire wall is marked with a thrust line. How > important is the horizontal thrust line. I want to know if I can lower > the engine about 1/2 inch. > Thanks. You probably won't notice the difference. -- Paul McIntosh http://www.rc-bearings.com > t On a Sig 4-star 40 kit the fire wall is marked with a thrust line. How > important is the horizontal thrust line. I want to know if I can lower > the engine about 1/2 inch. > Thanks. Thank guys , I think I will moveing it down a 1/2 inch. Will let you know what happens . > You probably won't notice the difference. > [quoted text clipped - 5 lines] > > the engine about 1/2 inch. > > Thanks. On that kind of aircraft, a 1/2" won't make any measurable difference. For the most part, stay with the design parameters (including the thrust line), however, if you have a good reason to change something, well, experimentation is part of the hobby. In this case, flight qualities won't change much. MJC > t On a Sig 4-star 40 kit the fire wall is marked with a thrust line. How > important is the horizontal thrust line. I want to know if I can lower > the engine about 1/2 inch. > Thanks. |
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