Dan. . .I assume you did the ply and CF lamination combination I suggested. It struck me as being fine for the kind of flying you described you would be doing. I should think you can progressively put it to greater flying stress and observe what's happening to build some confidence or mistrust in it.
I have some 3/8" x .042" and some 1/2" X .042" blue tempered clockspring steel material. If you feel you need something more substantial than the CF laminate to sandwich between the ply pieces, you can get some of this from me. I keep the stuff on hand to put in GENIE packages. It is not bendable, but you can grind some off the bottom at the end of the pieces to accommodate a dihedral angle. I have never had an airborne failure using the .042" steel, even on the 12' span, 6 pound GENIE in pedal to the metal launches in wind. What I do is in File 3 of the GENIE CD found at http://genie.rchomepage.com/. If you need some of the steel I can cut it to length for you. . .my cost plus shipping. ----- Original Message ----- From: "Dan Obermeyer" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Thursday, July 01, 2004 6:49 AM Subject: [RCSE] Wing joiner Testing > How much of a load should a wing joiner be able to take before failing? > > OK, using the excellent suggestions obtained from RCSE I have fabricated an inexpensive wing joiner to replace my expensive but broken carbon fiber one. > > How do I test it? > > The ship is a 3m Synergy 91. I never launch with a winch, I only slope. Maximum stress, I assume, comes when I pull out of a dive or snap a turn on a speed run. > > I have installed the joiner and suspended the wing from the tips. How much weight should I add at the center to provide a realistic test? > > I realize I could test to distruction (it is, after all, an inexpensive replacement) and then back off. But I would like to know what is a realistic load the ship might be subject to...not just the maximum strength of the joiner. > > Thanks. > > _____________________________________________________________ > Get Free Email at http://mail.danworld.com > RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED] Please note that subscribe and unsubscribe messages must be sent in text only format with MIME turned off. > RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED] Please note that subscribe and unsubscribe messages must be sent in text only format with MIME turned off.
