Brodhead Pietenpol Association

Original Posted By: kyle ray
Subject: Pietenpol-List: Help... do I have a major problem? -ReplyI used birch ply and Aerolite glue. Tested gussets both sanded andunsanded. NO failures in any of the glue joints. I concur with most of theothers, test a couple to destruction and get on with the rest of the plane.Greg Cardinal>>> Richard DeCosta 02/05 7:51 pm >>>I just got my copy of "Aircraft Building Techniques" from the EAA andhave read 3-4 chapters. I am now on rib #25, meaning I have done 24ribs before reading the section of the book on plywood.I am a little concerned now, as I have not "scuffed" or sanded myplywood before gluing to the ribs as the book suggests. I did thewater test as described in the book, whereby one pice of scap plywoodis scuffed and the other is not, then water is placed on both. As thebook predicted the water soaked readily into the scuffed piece butkindof beaded on the un-scuffed one, meaning glue would not soak in aswell either.Is this a major factor in the strength of my ribs? Should I scap the25 ribs I have built? or will they be strong enough without thisscuffing?Concerned,Richard==http://www.wrld.com/w3builderNow you can buy my CD at MP3.com:http://db.mp3.com/Visitor/order.php3?cd ... __________

Original Posted By: Ray Masters
I used birch ply and Aerolite glue. Tested gussets both sanded andunsanded. NO failures in any of the glue joints. I concur with most oftheothers, test a couple to destruction and get on with the rest of theplane.Greg Cardinal>>> Richard DeCosta 02/05 7:51 pm >>>I just got my copy of "Aircraft Building Techniques" from the EAA andhave read 3-4 chapters. I am now on rib #25, meaning I have done 24ribs before reading the section of the book on plywood.I am a little concerned now, as I have not "scuffed" or sanded myplywood before gluing to the ribs as the book suggests. I did thewater test as described in the book, whereby one pice of scap plywoodis scuffed and the other is not, then water is placed on both. As thebook predicted the water soaked readily into the scuffed piece butkindof beaded on the un-scuffed one, meaning glue would not soak in aswell either.Is this a major factor in the strength of my ribs? Should I scap the25 ribs I have built? or will they be strong enough without thisscuffing?Concerned,Richardhttp://www.wrld.com/w3builderNow you can buy my CD at MP3.com:http://db.mp3.com/Visitor/order.php3?cd ... __________

Original Posted By: Greg Cardinal
I am using epoxy glue and it is a must to presaturate the partsbefore final gluing. I scuffed the ply on all gussets but gotglue on an unscuffed surface which seemed to soak up the gluescuffed or not. After 5 min. of soaking the sheen is gone and theply looked like wet plywood the grain contrast is clearly visibleindicating that the glue did soak in scuffed or not. HOWEVER THIS IS WHAT I WOULD DO, DOESN'T MEANIT'S THE CORRECT WAY OR THE SAFE WAY TO PERFORMAIRCRAFT CONSTRUCTION, may be the brand plywoodclamping pressures type of glue etc. affect the abilityof the wood to absorb glue, so I would throughly test a sandedpiece of glued ply with and unsanded piece and note the results.maybe ply thats been stored in a stack 10' high has the grainso tightly compressed that it won't absorb glue but my plywhich is 1/16 birch soaks up glue or water sanded or not! The okoume is like a sponge put glue on it and it's likedisapears.-----Original Message-----