Brodhead Pietenpol Association

Original Posted By: "Oscar Zuniga"
Phil mentioned the matter of the elevator cables rubbing the leading edge of the horizontal stabilizer, and that most Piets seem to have that condition. Not John Dilatush's "Mountain Piet"!Check out the pictures at http://www.flysquirrel.net/piets/John_piet.html (second picture from the bottom) and you'll find that engineer John studied the geometries of the bellcranks, hinge points, and cables and built his such that everything stays true as it goes about its "four-bar linkage" motions. This is one fix that should be easy to figure out for those with the luxury of starting from scratch. Myself, with retensioning the tail rigging after the repairs to 41CC, I *almost* started to tension the lower aileron cables to match the uppers, but quickly realized that I'd put the controls in a bind when I pull the stick back if I did that.But they fly just fine with the setup 'per plans' and a section of clear plastic tubing over the upper aileron cables where they contact the LE of the HS to prevent scuffing the paint.Oscar ZunigaSan Antonio, TXmailto: taildrags(at)hotmail.comwebsite at http://www.flysquirrel.net________________________________________________________________________________

Original Posted By: Rick Holland
Thanks Oscar! John's "Mountain Piet" was just what I was looking for, at leastfor the elevator system. The workmanship on that plane is awesome (and I usethat word in it's dictionary sense).I've looked at the Brit page before and it is very good. I particularly like theway they often combine spoked wheels with tubed LG. That just makes a lotof sense to me.You guys are great for coming up with the answers. Phil Miller Altadena, CA________________________________________________________________________________Date: Tue, 20 Dec 2005 07:18:31 -0700

Original Posted By: Michael D Cuy
Rick asks->How high do you place it to eliminate the cable problem?To which I would respond, drawing it up with the 9" dimension reveals that the cable should clear.And Greg adds->I can tell you that raising the bellcrank 1 inch is NOT enough to allow the>cables to clear the stabilizer.OK, so 8" won't do it, but 9" should. But Chuck adds->I built my bellcrank to the '34 plans location, Dwg. #4 (dated 2-26-34)>with the 9" call out, and used a piece of thick leather on the L.E. of the>horizontal stab as the anti-chafe.Which leaves me puzzled, because graphically (AutoCAD and my Piet drawings), using the 9" dimension should have the upper elevator cable clear the LE of the HS. Go figure... or just plan on "using protective measures" since it's not a big deal anyway.Oscar ZunigaSan Antonio, TXmailto: taildrags(at)hotmail.comwebsite at http://www.flysquirrel.net________________________________________________________________________________Date: Tue, 20 Dec 2005 15:15:01 -0500