Timeline for How to determine angle of bank caused by shift in centre of gravity in an aircraft?
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| Apr 5, 2021 at 18:49 | comment | added | quiet flyer | So-- "it depends". In conventionally-shaped model airplanes with lots of dihedral, I've been surprised how little visible change in the "trimmed" bank angle is obtained by a rather significant weight on one wingtip. In the hang glider case, we could probably go on for several pages about all the different factors playing a role here, including the way that the dihedral-like effect created by wing sweep is strongly dependent on angle-of-attack, and the way that the way that washout creates a roll torque toward wings-level is also strongly dependent on aoa, but in the opposite direction. | |
| Apr 5, 2021 at 18:48 | comment | added | quiet flyer | @ RobertDiGiovanni and original poster-- Riffing on Robert's comment-- in most modern hang gliders, at LOW angle-of-attack (pilot's CG well forward, airspeed initially high), shifting pilot's weight say 12 inches to one side and keeping it there will result in a rather modest bank angle-- a wild guess would be maybe 15-20 degrees-- while at HIGH angle-of-attack (pilot's CG well forward, airspeed initially low), the same input will cause the glider to "wind up" into a rather steep spiral, eventually reaching a bank angle of over 60 degrees, in which case the airspeed will no longer be "low". | |
| Apr 4, 2019 at 0:02 | history | bumped | CommunityBot | This question has answers that may be good or bad; the system has marked it active so that they can be reviewed. | |
| Mar 6, 2019 at 16:06 | comment | added | Peter Kämpf | A sideways shift in the center of gravity will give you a rolling moment but not a stabilized bank angle. The rolling moment won't magically stop once a certain bank angle has been reached. What could stabilize the plane is a combination of speed, bank and sideslip, but not all designs will be stable at such an equilibrium. | |
| Mar 5, 2019 at 8:49 | comment | added | Robert DiGiovanni | you may wish to study hang gliders. Sorry for the tangle here. Shifting weight to the side will cause a rolling force. How far it progresses depends on roll stability of aircraft, and, of course, control inputs. This will be a unique property of each type of aircraft you study. Your initial thought is correct. You can learn more by building free flight models and adjusting the weight not only fore and aft, but also side to side (I use pennies). Good luck with this. | |
| Mar 4, 2019 at 21:39 | answer | added | Michael Hall | timeline score: 0 | |
| Mar 4, 2019 at 20:31 | answer | added | Jan Hudec | timeline score: 1 | |
| Mar 4, 2019 at 20:06 | comment | added | Robert DiGiovanni | this also depends if the aircraft has dihedral stability as well. I would read up on what makes an aircraft stable in flight to better understand how to "destabilize" it when you wish to change direction. | |
| Mar 4, 2019 at 13:41 | history | edited | Robert DiGiovanni | CC BY-SA 4.0 |
Correction of statement
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| Mar 4, 2019 at 13:20 | history | edited | user | CC BY-SA 4.0 |
added 129 characters in body; edited title
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| Mar 4, 2019 at 13:20 | review | First posts | |||
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| Mar 4, 2019 at 13:19 | history | asked | jim | CC BY-SA 4.0 |