Original Posted By: "Wayne McIntosh"
I have a question I didn't know I had until a recent EAA meeting. Which waydoes the grain of the ply run on the leading edge? With the leading edge orwith the ribs? I assumed with the LE until an old timer said it should beright angles to the LE.TedGetting close to finishing wings and making lots of sawdust________________________________________________________________________________
Pietenpol-List: Leading edge ply direction
Re: Pietenpol-List: T-88 or Polyurethene Glue
Original Posted By: "matt miller"
Matt, I used polyurethane glue, Excel is the brand, when I built the ribs formy Rag-A-Muffin ultralight. I then switched to T88 for the rest of theplane. Although Excel polyurethane is good strong glue it has somedisadvantages. First after the bottle has been opened about a month the glueinside starts to get lumps in it and I decided not to use it anymore. Alsoit really does not have good gap filling ability. The foam that bubbles outof the joint and into the gap is not strong. In some tests I made to compareExcel and T88 they both did well but I think T88 is stronger. I finished myRag-A-Muffin 2 1/2 years ago and now have 87 hours of flight on it and havehad no trouble with any glue joints. Last summer I tried an experiment withsome old 2 year old T88 that had actually started to get lumps in thehardener. This stuff was hard to mix but finally after much stirring itmixed. I found 2 damp 2x4 cutoffs that were lying outside and planed off thedirt and lap glued them together overlapping 5". I let the glue cure for 2weeks then laid the board between 2 cement blocks and jumped on it with mymuscular 200 pound body. after 4 or 5 jumps the boards broke but not theglue joint. Use T88 be very clean and use fresh stuff read up on making gluejoints with epoxy glue and fly with confidence.Wayne McIntosh Lafayette IN.---- Original Message -----
Matt, I used polyurethane glue, Excel is the brand, when I built the ribs formy Rag-A-Muffin ultralight. I then switched to T88 for the rest of theplane. Although Excel polyurethane is good strong glue it has somedisadvantages. First after the bottle has been opened about a month the glueinside starts to get lumps in it and I decided not to use it anymore. Alsoit really does not have good gap filling ability. The foam that bubbles outof the joint and into the gap is not strong. In some tests I made to compareExcel and T88 they both did well but I think T88 is stronger. I finished myRag-A-Muffin 2 1/2 years ago and now have 87 hours of flight on it and havehad no trouble with any glue joints. Last summer I tried an experiment withsome old 2 year old T88 that had actually started to get lumps in thehardener. This stuff was hard to mix but finally after much stirring itmixed. I found 2 damp 2x4 cutoffs that were lying outside and planed off thedirt and lap glued them together overlapping 5". I let the glue cure for 2weeks then laid the board between 2 cement blocks and jumped on it with mymuscular 200 pound body. after 4 or 5 jumps the boards broke but not theglue joint. Use T88 be very clean and use fresh stuff read up on making gluejoints with epoxy glue and fly with confidence.Wayne McIntosh Lafayette IN.---- Original Message -----
Re: Pietenpol-List: Leading edge ply direction
Original Posted By: "Ted Brousseau"
Ted,I just remember ,that to cut the pieces, they were longwise to the 4x8 sheetof ply that I bought.And not to be a wiseguy, but as the story goes,,,Bernard used the cardboardfrom Quacker Oatmeal boxes for his leading edge, So it probably doesn'tmake any difference.walt----- Original Message -----
Ted,I just remember ,that to cut the pieces, they were longwise to the 4x8 sheetof ply that I bought.And not to be a wiseguy, but as the story goes,,,Bernard used the cardboardfrom Quacker Oatmeal boxes for his leading edge, So it probably doesn'tmake any difference.walt----- Original Message -----
Re: Pietenpol-List: Leading edge ply direction
Original Posted By: "Ted Brousseau"
Ted: if it's 1.5mm or 1/16 inch it probably is 3 ply. That would meanthat the two outside plys run parallel. In my experience I've found runningthe two outside plys parallel to the leading edge seems to allow the plywoodto bend easier. That is the grain direction runs parallel to the leadingedge. Maybe I'm imagining it but that seems to be less straining on theplywood at that leading edge bend. That's the way I've run mine.Talk later, Bert----- Original Message -----
Ted: if it's 1.5mm or 1/16 inch it probably is 3 ply. That would meanthat the two outside plys run parallel. In my experience I've found runningthe two outside plys parallel to the leading edge seems to allow the plywoodto bend easier. That is the grain direction runs parallel to the leadingedge. Maybe I'm imagining it but that seems to be less straining on theplywood at that leading edge bend. That's the way I've run mine.Talk later, Bert----- Original Message -----
Re: Pietenpol-List: Leading edge ply direction
Original Posted By: "Bert Conoly"
My piet has alum. leading edge works fine if anyone looking another option.mike----- Original Message -----
My piet has alum. leading edge works fine if anyone looking another option.mike----- Original Message -----
RE: Pietenpol-List: bending lower longerons
Original Posted By: owner-pietenpol-list-server(at)matronics.com
They bend very easily dry. No need to wet them. T-88 holds, but becareful until you get the gussets on. End grain joints are known to"pop" if they are bumped or strained.DJ-----Original Message-----
They bend very easily dry. No need to wet them. T-88 holds, but becareful until you get the gussets on. End grain joints are known to"pop" if they are bumped or strained.DJ-----Original Message-----
> Pietenpol-List: Leading edge ply direction
Original Posted By: Dennis Engelkenjohn
Pietenpol-List: bending lower longerons
Original Posted By: del magsam
Re: Pietenpol-List: bending lower longerons
Original Posted By: Dennis Engelkenjohn