umm, I believe without potential energy (force) there can be no resonance nor oscillation.
Anyway, more to the point what I was hoping to find out is "Am I the only home experimenter that has noticed flutter seems better controlled by making a flight control and it's counter balance a ridgid structure and arranging it with the center of pressure (drag) behind the hinge, cg being located forward of the hinge, and not with the cg centered at the hinge?" This has been my observation through a series of experiments. I am going to pose this question to my AI/AP next time I see him. jg On Sun, Jun 5, 2022, 08:39 Doug Steen via KRnet <krnet@list.krnet.org> wrote: > John, > Flutter is initiated by resonance, not by force. The resonance frequency > of vibration causes amplitude to increase to infinity causing structural > failure. Manner of excitation, stiffness, dampning/energy absorption are > all factors. I can no longer do the math, but this us why balancing > controls and respecting VNE are so important. > > On Sat, Jun 4, 2022, 6:37 PM John Gotschall via KRnet < > krnet@list.krnet.org> wrote: > >> thanks. >> >> I have observed structures in flight. >> >> I have flown several rc airplanes beyond vne and witnessed the crafts >> begin control surface flutter and the event continues through to >> destruction of horizontal stabs for elevator flutter and wing destruction >> from aileron flutter. >> >> I have built replacement rc aircraft and modified the control surfaces >> with weights forward of the hinge location to eliminate flutter, but I have >> never targeted neutral balance. instead I target balance to exist forward >> of the hinge. >> >> like an arrow in flight I want a rigid structure that is "nose heavy" for >> stability. >> >> I have not found the engineering analysis that can quantify the forces >> allowing for prediction of flutter events. >> >> jg >> >> >> >> >> On Sat, Jun 4, 2022, 2:58 PM David Maultsby <dmault...@win.net> wrote: >> >>> John, >>> >>> >>> >>> I believe doing a quick “Google” search for “Flutter Analysis” will lead >>> you to a much fuller understanding of calculating your correct control >>> balances. If you still have questions, please send me your specific >>> requirements and I will attempt to work through them for you. My basic >>> understanding is to balance each control surface with the same weight ahead >>> of it’s hinge point as behind it. As evidenced by the loss of a P-51 at >>> Reno, higher speeds may even require balancing trim tabs. >>> >>> >>> >>> Sent from Mail <https://go.microsoft.com/fwlink/?LinkId=550986> for >>> Windows >>> >>> >>> >>> *From: *Ted Sanders via KRnet <krnet@list.krnet.org> >>> *Sent: *Wednesday, May 25, 2022 10:34 AM >>> *To: *krnet@list.krnet.org >>> *Cc: *Ted Sanders <tedsande...@gmail.com> >>> *Subject: *KRnet> Flight Corvair for sale >>> >>> >>> >>> I have a flight corvair available for sale. If anyone is interested I >>> can provide details of the rebuild and photos. It is located in Chino >>> California >>> >>> >>> >>> >>> >>> On Mon, May 16, 2022 at 6:33 PM John Gotschall via KRnet < >>> krnet@list.krnet.org> wrote: >>> >>> Can anyone recommend a good book or source for info on how to calculate >>> the correct control balances for a variety of wing/horizontal stab types? >>> >>> >>> >>> jg >>> >>> >>> >>> -- >>> KRnet mailing list >>> KRnet@list.krnet.org >>> https://list.krnet.org/mailman/listinfo/krnet >>> >>> >>> -- >>> KRnet mailing list >>> KRnet@list.krnet.org >>> https://list.krnet.org/mailman/listinfo/krnet >>> >> -- >> KRnet mailing list >> KRnet@list.krnet.org >> https://list.krnet.org/mailman/listinfo/krnet >> > -- > KRnet mailing list > KRnet@list.krnet.org > https://list.krnet.org/mailman/listinfo/krnet >
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