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#1
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I've often wondered how 2 channel R/C works without ailerons (obviously
well enough, right?) I know a guy with a Yak-52, and I've noticed what looks like an almost complete lack of dihedral on its wing. I suppose that has a lot to do with its stability (or lack thereof?) The Chinese version (Nanchang) has dihedral starting on approx the outer 1/3rd of its span IIRC. |
#2
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2 channel (w/o ailerons) works great. You'll never see a aileron-less
model without dihedral (I understand swept wings work too but I've never seen that). single channel works too - how does one do a loop with rudder-only? Quite well thank you. Acrobatic R/C with a normal configuration a/c are often straight winged or close too it. That's to isolate the function of the rudder so it causes yaw only. Works pretty well except for some effects from fuselage blanking and such. But that's when R/C aircraft were mosting just trying to model full scale aircraft. That balloon was busted a long time ago. What is this? http://youtube.com/watch?v=K6besEwoR...c%20hydroplane wrote: I've often wondered how 2 channel R/C works without ailerons (obviously well enough, right?) I know a guy with a Yak-52, and I've noticed what looks like an almost complete lack of dihedral on its wing. I suppose that has a lot to do with its stability (or lack thereof?) The Chinese version (Nanchang) has dihedral starting on approx the outer 1/3rd of its span IIRC. |
#3
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Take a look at "Aerodynamics for Naval Aviators" NAVWEPS 00-80T-00, Page
295.... "Maule Driver" wrote in message m... 2 channel (w/o ailerons) works great. You'll never see a aileron-less model without dihedral (I understand swept wings work too but I've never seen that). single channel works too - how does one do a loop with rudder-only? Quite well thank you. Acrobatic R/C with a normal configuration a/c are often straight winged or close too it. That's to isolate the function of the rudder so it causes yaw only. Works pretty well except for some effects from fuselage blanking and such. But that's when R/C aircraft were mosting just trying to model full scale aircraft. That balloon was busted a long time ago. What is this? http://youtube.com/watch?v=K6besEwoR...c%20hydroplane wrote: I've often wondered how 2 channel R/C works without ailerons (obviously well enough, right?) I know a guy with a Yak-52, and I've noticed what looks like an almost complete lack of dihedral on its wing. I suppose that has a lot to do with its stability (or lack thereof?) The Chinese version (Nanchang) has dihedral starting on approx the outer 1/3rd of its span IIRC. |
#4
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Do you have a link?
Andrew included this explanation in his response which is the one I was trying to recite (excerpt): What, then, is the real explanation as to why a dihedral angle is an aid to lateral stability? When the wings are both equally inclined the resultant lift on the wings is vertically upwards and will exactly balance the weight. If, however, one wing becomes lower than the other, then the resultant lift on the wings will be slightly inclined in the direction of the lower wing, while the weight will remain vertical. Therefore the two forces will not balance each other and there will be a small resultant force acting in a sideways and downwards direction. This force is temporarily unbalanced and therefore the aeroplane will move in the direction of this force - i.e. it will sideslip - and this will cause a fow of air in the opposite direction to the slip. This ahs the effect of increasing the angle of attach of the lower plane and increasing that of the upper plane. The lower plane will therefore produce more lift and a restoring moment will result. Also the wing tip of the lower plane will become, as it were, the leading edge so far as the slip is concerned; and just as the center of pressure across the chord is nearer the leading edge, so the center of the pressure distribution along the span will now be on the lower plane; for both these reasons the lower plane will receive more lift, and after a slight slip sideways the aeroplane will roll back into its proper position. As a matter of fact, owing to the protetcion of the fuselage, it is probably that the flow of air created by the sideslip will not reach a large portion fo the raised wing at all; this depends very much on the position of the wing relative to the fuselage. William Snow wrote: Take a look at "Aerodynamics for Naval Aviators" NAVWEPS 00-80T-00, Page 295.... |
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