Ballancing the control surfaces will not prevent flutter. You will still have some speed at which flutter will occur. The trick is to make that speed as high as possible. Things that will raise the flutter speed include the following:
1. ballancing the control surface 2. making the total weight of the control surface as low as possible This is why you want to have your aileron ballance weights as far forward as you can to keep the amount of weight used as low as possible. Get all your weight as close to the rear spar as you can. Also it would help a lot to just use one layer of carbon fiber for your ailerons to keep them stiff and light. Use extra care to make your foam in the aileron area straight and smooth so you don't need a lot of filler, fill with just dry micro, and keep the painting light. 3. make sure there is as little play in the control system, particularly the ailerons, as possible 4. make sure there is no flex in the control system. This is one area that I still need to work on the Stang. It has a belcrank mounts that are rivited to the fusalage sides on each side of the stick then it has bushing blocks rivited to the fusalage sides where the pushrods connect to the aileron torque tubes. I was shocked when I put some clamps on one aileron then I was able to flex the other one up and down several inches. I will add some reinforcements to the two areas in the system that are letting the system flex. The KR should not have near the problem the way it is done, but clamp one aileron and try it out. That will indicate the play and the flex you have in the system. Any one that is more qualified please chime in. I am not an aeronautical engineer and we could all benefit from more information or links to more. Brian Kraut Engineering Alternatives, Inc. www.engalt.com -----Original Message----- From: [email protected] [mailto:[email protected]]On Behalf Of Ron Hoskins Sent: Saturday, December 23, 2006 11:39 PM To: [email protected] Subject: Re: KR> Flutter Testing Thanks Brian. I learned alot from your post. Lots of good info. I have come to believe that balancing the control surfaces will prevent flutter? Is this true or false??? Have a great Christmas all. Ron... _______________________________________ Search the KRnet Archives at http://www.maddyhome.com/krsrch/index.jsp to UNsubscribe from KRnet, send a message to [email protected] please see other KRnet info at http://www.krnet.org/info.html
