Brodhead Pietenpol Association

Original Posted By: "Greg Yotz"
Among other comments, many of which may have beenserious, wrote:> Im using Basswood plywood wherever ply is called for.BASSWOOD?! Did you ask your Tech. Rep. about that?Or are you just checking to see whether we're awake?Owen Davies________________________________________________________________________________

Original Posted By: owner-pietenpol-list-server(at)matronics.com
Now let me start off with I'm going to rib stitch. If for nothing elsebecause I sat for 2 hours learning how at Sun-n-Fun. (Thanks to the guysin the tent, I learned a lot)First let me warn you that I am technically an electronic engineer andnot a aerodynamic nor structural engineer.... The fact that I fly inthings I've worked on or built should scare me and others... ;-)I think that rib stitching might help spread the load to the lower partof the rib, but is it really necessary and by how much? If it is, whydid I put on all those damn gussets on my ribs? My glue joints arestronger than the wood. I've proven it to myself many times with testpieces tested to destruction. As far as the theory of putting the ribin compression over tension, well I would bet(haven't tested) that therib stitching string will stretch much farther than the wood I made myribs out of, even if it is tied tightly. Which means the rib truss workis still in tension when the wing is in flight and you have a lowpressure area over the wing, but by how much? I think that screwing with the proper method might work as well butseems even more tedious than stitching. I think the necessary endresult is to keep the covering the correct airfoil shape and not toallow it to "drum" or oscillate. Just make sure you use rib and antichaff tapes and remember to not keep your anti chaffing tape in youwife's chaffing dish, it seems to make them upset.My $.0275 worth.(adjusted for inflation)GregGN-1 close to covering...God, will it ever be done? Send me a sign.(UPS blue please)-----Original Message-----