HI phil I have put the tubing with the lead at the tips I am going to glass around the tube and over the elevator to past the hinge point as I thought that a twisting problem could arise!! I would guess that after the elevator is properly balanced the extra weight would be less than 750 grams I have also used mil fibre as it has good compressive strength under the glass as I have removed some foam at the attachment area. Yes I was worried about it being a problem and looked at the possible problems and I feel that it should not be to much of a problem I would have liked to have a linkage inside the boat but the aircraft was finished there when I got it! I beleive the original builder was looking to do the same as I am doing. I also wonder about the aeileron balancing arms they look a little week to me to!!! cheers
Ross >From: "Phillip Matheson" <mathe...@dodo.com.au> >Reply-To: KRnet <kr...@mylist.net> >To: "KRnet" <kr...@mylist.net> >Subject: Re: KR>elevator mass balancing!! >Date: Tue, 6 Apr 2004 14:54:59 +1000 > >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 _________________________________________________________________ We've 100s of NEW questions! Play Millionaire online to win $$$$. Click here http://sites.ninemsn.com.au/minisite/millionaire/default.asp
