Aerobatics(at)aol.com
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 Posted: Fri Feb 06, 2009 6:37 pm Post subject: Problem with FLUTTER ? ! ? ! Must fix |
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Everything naturally wants to flutter in the wind. The long ailerons can be very susceptible if there is any flexing or slop in the linkages. Furthering the issue is the flaperon linkage from the stick to the aileron. Stiffer is better than loose.
Full amplitude of the flutter can be achieved in just a few cycles... a second. Stay away from it. Its speed related. Part of the solution is mass balancing. I believe you should have at LEAST one per aileron and the must be installed. The other is carefully looking at the entire linkage for ANY slop.
Fix this issue. If it happens again you must slow down right away and land. Interesting, you will need to slow down to a slower speed than it started to get it to stop ....
Flutter is brutal to hinges, control surfaces, linkages .... ok ok everything!
I had it once briefly and let me tell you I re tightened everything and STRICKLY adhere to VNE. I have since flown probably 350 plus hours without another hint of it...
Fly Safe, enjoy
Dave KF 2 582 Blue hd E box....
iIn a message dated 2/6/2009 8:00:22 P.M. Central Standard Time, james.t.trizzino(at)us.army.mil writes:
| Quote: | --> Kitfox-List message posted by: "WurlyBird" <james.t.trizzino(at)us.army.mil>
So today was my first day of instruction in my KF3 and it was a blast. The instructor pretty much let me do my thing and talked me threw a couple takeoffs and landings and then we just flew around for a couple hours constantly requesting the controls from the other person.
So I have a few questions now that I actually have some time in the KF but the biggest one involves what I can only describe as "flutter". It was our final leg as we flew back to the airport after buzzing my house, cruising at about 75-80 mph when an updraft hit one of the wings and set off a vibration in the wings. It only lasted a few seconds while I throttled back and slowed down quickly. There appeared to be a pivot, or node for you engineer types, at each wing support point and one in the center of the cockpit which was evidenced by feeling like I was in a drink shaker. The wings were not acting in unison and it felt VERY uncomfortable. I have seen video of gliders doing this at speeds above Vne. It gave us both a startle and I would like to figure out what possible causes were for this and if it is something I can fix or if it is just somethings that happens. I seriously doubt this is normal, but who knows maybe it is how to pick out the "New Guy".
Thanks for the help.
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