Timeline for Does "pendulum effect" apply to hang gliders or any aircraft?
Current License: CC BY-SA 4.0
8 events
| when toggle format | what | by | license | comment | |
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| Oct 29, 2018 at 21:07 | comment | added | quiet flyer | (In that case the issue being not pendulum effect but adverse yaw and resulting roll torque due mainly to differential airspeed between left and right wings.) | |
| Oct 29, 2018 at 21:01 | comment | added | quiet flyer | "The pendulum effect on a parasail is so strong that they are able to bank by skidding even though the skid is induced by increasing lift on the inside half of the wing (it's the accompanying drag that's doing the actual turning). In other words pendulum effect overpowers the opposite rolling moment of the lowered trailing edge."-- so they are deflecting their "ailerons" the "wrong" way! Actually I've heard that before. PS didn't human-powered Gossamer Albatross do same? | |
| Jul 14, 2018 at 1:09 | comment | added | John K | Ok I see your point. I've edited my post. See if that helps. | |
| Jul 14, 2018 at 1:09 | history | edited | John K | CC BY-SA 4.0 |
added commentary in response to comment.
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| Jul 13, 2018 at 21:05 | comment | added | TomMcW | But some people dispute that there even is such an effect, no matter how small. I understand all the effects due to sideslip, but does the fact that the cg is not directly below the center of lift create a roll moment? PK made the point that the lift vector is always radial to cg, therefore can create no roll moment, no matter how far away it is | |
| Jul 13, 2018 at 20:50 | comment | added | John K | The first sentence answered the question. There is an effect but it is too mild to be significant. The rest was an explanation of why, and what "aerodynamic dihedral" is about, which is the real benefit of the high wing configuration from a lateral stability standpoint. Seems pretty straightforward to me. | |
| Jul 13, 2018 at 17:13 | comment | added | TomMcW | All that you describe except for the last paragraph is dihedral effect. This is a completely aerodynamic effect and has nothing to do with gravity or a pendulum. What the question is getting at is whether gravity can cause a roll moment due to CoG being lower than the center of lift. | |
| Jul 12, 2018 at 2:02 | history | answered | John K | CC BY-SA 4.0 |