Brodhead Pietenpol Association

Original Posted By: steve(at)byu.edu
I used a piece of 3 inch copper pipe 18 inches long, capped on oneend.Put about 14 inches of water in, add two cap strips and boil on thestove 20 - 30 minutes. If they are boiled too long they have a greater tendency to kink whenyou try to bend them.I also found that making a jig to pre-bend the cap strip prior toputting it in the rib jig to be redundant.Mine went straight from the boiling water to the rib jig and satovernight. Glued up the following day. Worked great.Greg Cardinal________________________________________________________________________________

Original Posted By: "Mr. Carmen A. Natalie"
1, on changing subjects, When replying just change the subject line, orstart a new thread by sending a new message to the list (piet(at)byu.edu)2, Unwarping ailerons, pull off the fabric. Determine how bad the warp iswithout the fabric. Remove the warp on a flat surface by putting the bracesin and recovering, or rebuilding the aileron. Flutter isn't likely to be aproblem because of the slow speed of the piet. None of the controls aremass balanced.Steve E.-----Original Message-----Larry PasleySent: Monday, October 12, 1998 4:07 PMSubject: Pietenpol-List: Re: Wing Rib bendingThis isn't on rib bending, but, being new, don't know how to address thegroup without replying to a previous question.Here is the problem;I had new fabric and paint put on the plane I bought, a GN-1. It has thepiet wing as far as I can determine. The ailerons are warped, probably dueto over tighting of the fabric. When the inside trailing edge corner isaligned up with the wing, the outside trailing edge corner will be warpeddown about 2 inches. It's this way on both ailerons. I can see through thefabric well enough to see that there is no cross bracing in the ailerons.A friend suggested we take the cover off, get the ailerons squared andflat, and glue something like 3/32 plywood on both sides before we recover.Another friend said he would be afraid to do that since the ailerons arenot counter balanced and it might cause flutter.It doesn'e seem likely to cause flutter to me, but I don't want to takeunnecessary chances. Also I don't know if that is the best way to solve theproble or not.Any expert advice would be appreciated.Thanks, Larry>> I used a piece of 3 inch copper pipe 18 inches long, capped on one> end.> Put about 14 inches of water in, add two cap strips and boil on the> stove 20 - 30 minutes.> If they are boiled too long they have a greater tendency to kink when> you try to bend them.> I also found that making a jig to pre-bend the cap strip prior to> putting it in the rib jig to be redundant.> Mine went straight from the boiling water to the rib jig and sat> overnight. Glued up the following day.> Worked great.>> Greg Cardinal>________________________________________________________________________________

Original Posted By: steve(at)byu.edu
This isn't on rib bending, but, being new, don't know how to address thegroup without replying to a previous question.Here is the problem;I had new fabric and paint put on the plane I bought, a GN-1. It has thepiet wing as far as I can determine. The ailerons are warped, probably dueto over tighting of the fabric. When the inside trailing edge corner isaligned up with the wing, the outside trailing edge corner will be warpeddown about 2 inches. It's this way on both ailerons. I can see through thefabric well enough to see that there is no cross bracing in the ailerons. A friend suggested we take the cover off, get the ailerons squared andflat, and glue something like 3/32 plywood on both sides before we recover.Another friend said he would be afraid to do that since the ailerons arenot counter balanced and it might cause flutter.It doesn'e seem likely to cause flutter to me, but I don't want to takeunnecessary chances. Also I don't know if that is the best way to solve theproble or not.Any expert advice would be appreciated.Thanks, Larry > > I used a piece of 3 inch copper pipe 18 inches long, capped on one> end.> Put about 14 inches of water in, add two cap strips and boil on the> stove 20 - 30 minutes. > If they are boiled too long they have a greater tendency to kink when> you try to bend them.> I also found that making a jig to pre-bend the cap strip prior to> putting it in the rib jig to be redundant.> Mine went straight from the boiling water to the rib jig and sat> overnight. Glued up the following day. > Worked great.> > Greg Cardinal> ________________________________________________________________________________