You are correct Allen, it is always better to taper the plywood. It reduces the stress concentration that would occur otherwise. And the taper needs to be pretty healthy, if I recall 10 or 12 to 1 is the recommendation. You can do the trim tab either way. I made my hinge line parallel to the spar so the trailing edge of my trim tab is slanted. I guess you could say this would produce slightly less drag as there wouldn't be a "side" force applied from the angled trim tab sides. But any deflection in a trim tab is going to produce drag so which ever way is easiest for you will work.
Stephen Teate Paradise, Texas -----Original Message----- From: krnet-boun...@mylist.net [mailto:krnet-boun...@mylist.net] On Behalf Of Allen Wiesner Sent: Thursday, May 11, 2006 1:01 AM To: KRnet Subject: KR> Questions on Stabilizer/Elevator Construction I have just been making my own drawing on the Stab./El. assy. (consolidating everything on one piece of (virtual) paper helps to get it all straight in my head) and I've noted two things. 1. The 1/4" plywood doublers are shown cut off square. I have always thought that it was good practice to taper the ends. Has anyone bothered to taper them? 2. The trim tab sides are shown as cut perpendicular to the spar. Wouldn't it be more practical to have them cut perpendicular to the trim tab hinge line and the trailing edge of the elevator? Allen G. Wiesner KR-2SS/TD S/N 1118 65 Franklin Street Ansonia, CT 06401-1240 (203) 732-0508 flash...@usadatanet.net _______________________________________ Search the KRnet Archives at http://www.maddyhome.com/krsrch/index.jsp to UNsubscribe from KRnet, send a message to krnet-le...@mylist.net please see other KRnet info at http://www.krnet.org/info.html
