Good Morning, Oppo

"ttyymmnn" (ttyymmnn) 10/08/2020 at 09:10 • Filed to: good morning oppo

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!!!error: Indecipherable SUB-paragraph formatting!!! (NC15525) at Alameda in 1938

Thomas Donohue > ttyymmnn 10/08/2020 at 09:58

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Grandfather of the iCon A5

gmporschenut also a fan of hondas > ttyymmnn 10/08/2020 at 12:22

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Not a pilot but lack of rudders must  have some  interesting handling.

ttyymmnn > gmporschenut also a fan of hondas 10/08/2020 at 12:32

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I’m not a pilot either, and it would be great if Bicycle Buck or Williams SW could chime in on this one. I read that it turned with a combination of ailerons and elevator, so I can only surmise that a combination of roll while lifting or lowering the tail produced a turn. 

Only Vespas... > ttyymmnn 10/08/2020 at 13:01

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Where does it say no rudders?  I can clearly see the outlines of rudders...but boy that must have been a loud cockpit...kind of like half a Cessna Skymaster with 1930's sound insulation materials...horsehair?  Wool? 

ttyymmnn > Only Vespas... 10/08/2020 at 13:07

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Wiki: The aircraft had no rudder as such, the tailplane fins being adjustable but fixed in flight. Turning was by differential aileron and elevator alone.

TheRealBicycleBuck > ttyymmnn 10/08/2020 at 13:26

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It’s called Banking and Yanking. Roll the plane to get the bank angle you want and yank back on the stick to turn. It’s a common method for controlling smaller R/C aircraft. The rudder is used to “coordinate” the turn, but it’s not much of an issue on model planes. Things are different with full-size aircraft.

When turning in an airplane, the wings produce differential lift. The wing on the outside of the turn is following a wider arc and so it’s moving through the air faster than the inside wing. Faster speed means more lift which results in more drag. The end result is that the nose of the plane tends to rotate upward. The rudder helps to counteract that force by counteracting the induced drag from the outside wing.

If you don’t coordinate the turn and let it go too long , there’s a risk of spinning the plane. Trainer aircraft are usually designed to counteract this, but some small planes are very sensitive to induced yaw from uncoordinated turns.

It’s like the need for a differential and ackerman steering on a car - the inside and outside wheels rotate at different speeds and the wheels follow different paths. The differential and the steering angles are meant to prevent tire scrub when going around corners.

It’s not absolutely necessary to have a rudder, but it sure helps in adverse conditions, especially in cross-wind landings.

ttyymmnn > TheRealBicycleBuck 10/08/2020 at 13:32

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Thanks. It’s an interesting arrangement, because it seems like you could adjust the rudders preflight, but not during. The only reason I could think for not having a traditional rudder is simplicity, since Stearman-Hammond were trying to make an affordable aircraft. 

Only Vespas... > ttyymmnn 10/08/2020 at 13:58

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So it’s like the Ercoupe, I guess.

ttyymmnn > Only Vespas... 10/08/2020 at 14:03

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Similar theory, but the Ercoupe was a better plane.

First RATO (or JATO if you prefer) in the US was flown by an Ercoupe.