Commercial Written - dumb questions

jfleisher said:
I was once told that the right turn about the longitudinal axis is due to the slip stream air spiraling back and hitting the left wing on its underside and the right wing on its topside, thus turning the plane to the right. I would imagine that this effect would vary though between aircraft, such as piper/cessna etc due to the wing position. I also feel that its probably negligable at best, since most books dont even mention it.
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Possibly. The only problem I see with that thought is if the slipstream were to "hit" the bottom of the wing, it would be an altering effect to the slipstream. Said another way, if the air were to strike the left wing from underneath, the air being a fluid substance, would quite possibly change direction and be deflected downward and result in the slipstream never reaching the tail. There is no question that the wings experience some resultant force from the slipstream but I immediately cant see it causing the aircraft to roll right about the longitudinal axis. As you mentioned, it will also vary how much interference each type of aircraft would experience depending on wing location.
 
meritflyer said:
Possibly. The only problem I see with that thought is if the slipstream were to "hit" the bottom of the wing, it would be an altering effect to the slipstream. Said another way, if the air were to strike the left wing from underneath, the air being a fluid substance, would quite possibly change direction and be deflected downward and result in the slipstream never reaching the tail. There is no question that the wings experience some resultant force from the slipstream but I immediately cant see it causing the aircraft to roll right about the longitudinal axis. As you mentioned, it will also vary how much interference each type of aircraft would experience depending on wing location.
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Yea thats what I was thinking too, im glad you said it.
 
meritflyer said:
Torque?
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No, spiralling slipstream.

But I'm going to delete the message. I misread his statement. The poster's message was saying the roll produced by the spiralling slipstream is negligible, which I would agree with on most airplanes.

I thought he was saying that spiralling slipstream was neglible.
 
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