15 Gs - hahhah - hehheh - in a tail, thats a good one.
----- Original Message ----- From: "Phillip Matheson" <mathe...@dodo.com.au> To: "KRnet" <kr...@mylist.net> Sent: Monday, April 05, 2004 11:54 PM Subject: Re: KR>elevator mass balancing!! > Hi all > I have ,for sometime been concerned about the mass balancing of my elevator. > This has been a hot subject lately, and many have talked about elevator tip > weights. I would like to hand on some points I found out when I visited an > aircraft structural engineer on the weekend. > I took my tail plane and elevator along to show him. > Note: My tail plan has been extended 12 inches, due to longer Dan Diehl wing > skins used. > I also took the KR plans with me. > > After much talk on my building techniques I was happy to say it passed his > inspection. > I wanted to pass on some of his comments on mass balancing a tail plane > > He was concerned about placing weights onto the elevator tips, as the > elevator plans are not designed for this and twisting of the elevator MAY be > a problem. > His advise was to do as Mark Langford has done( or similar) and place the > weights on the Control linkage , and not the elevator tips. > > Reasons > 1. twisting of the elevator tips > 2. the mass balance arm and mountings must be able to carry 15 times the > weight of the mass balance > ( 12 times minimum and 3 for safety factor). > >From this I would be concerned at adding 4130 lead filled tubing or similar > to my elevator tips. > > He was not impressed with the Aileron mass balance mounting arms as well. He > could believe the plans do not insist on a gusset welded to the mass balance > arm to stop cracking , failure. > > Now I'll stand back and face the music. > > > Phil Matheson > mathe...@dodo.com.au > Australia > 61 3 58833588 > See our VW Engines and home built Parts > and Kits at: > http://www.vw-engines.com/ > www.homebuilt-aviation.com > > > > _______________________________________ > to UNsubscribe from KRnet, send a message to krnet-le...@mylist.net > please see other KRnet info at http://www.krnet.org/info.html > >
