Original Posted By: shad bell
Pietenpol-List: Nose of de Riblett
Pietenpol-List: Re: Pietenpol aerobatics
Original Posted By: "Pieti Lowell"
I probably over-analyzed the leading edge question myself to the point of paralysis.Tried using a plane to shape wood, it works, but I couldn't get two winglength pieces made with a consistent enough shape.My top wings follow the Gregga GN-1 specs and have a 1 inch square wood piece supporting.016 aluminum. (They are done, but even with each side cut in to threepieces of aluminum, and a zillion little nails/brads holding them down, theymove a lot with temperature changes, think wood is the way to go.)What I finally decided to do was have custom cutters made up by a molding shopto exactly the shape of the leading edge and then have them make up a couple perfectshaped boards for me. It took two weeks and $240, and still left the challengeof shaping the ends to blend in with the wingtips. My wingtip ends extendedwell past where the leading edge wood was going to attach and I had no ideahow to get the cut right on the wingtip wood. The long molding leading edgepieces were flexible enough that I was able to bend them, and clamp the leadingedge piece in place, butting up against the side of the wingtip. I used abackwards clamp (pushing out) to slightly extend the leading edge molding piecepast where it would intersect with the wingtip (so I would have some room tosquare and true up the wingtip) then used a thin japanese pull saw against theleading edge to cut the wingtip. Then took off the clamped on leading edge andfiled and sanded the wingtip flat and to length.The wingtip matched up to the leading edge perfectly. Then I clamped the leadingedge in place at many points, and used a plane to shape the end to blend withthe wingtip. thought it would have been exactly in the middle of the leadingedge, but it was about 1/3 from the top instead of 1/2, so I planed it twiceon the long side for every once on the short one. Did some rounding strokes tomake it all even and it came out well. Once it was approaching the size I thoughtit should be (about same size as the wingtip it was joining with) I usedthe japanese saw to cut the leading edge end to length, and then a fine file andsanding blocks to finish it up.Think it turned out well.Jim D.Read this topic online here:http://forums.matronics.com/viewtopic.p ... ttachments: http://forums.matronics.com//files/img0 ... ___Subject: Pietenpol-List: Re: Pietenpol aerobatics
I probably over-analyzed the leading edge question myself to the point of paralysis.Tried using a plane to shape wood, it works, but I couldn't get two winglength pieces made with a consistent enough shape.My top wings follow the Gregga GN-1 specs and have a 1 inch square wood piece supporting.016 aluminum. (They are done, but even with each side cut in to threepieces of aluminum, and a zillion little nails/brads holding them down, theymove a lot with temperature changes, think wood is the way to go.)What I finally decided to do was have custom cutters made up by a molding shopto exactly the shape of the leading edge and then have them make up a couple perfectshaped boards for me. It took two weeks and $240, and still left the challengeof shaping the ends to blend in with the wingtips. My wingtip ends extendedwell past where the leading edge wood was going to attach and I had no ideahow to get the cut right on the wingtip wood. The long molding leading edgepieces were flexible enough that I was able to bend them, and clamp the leadingedge piece in place, butting up against the side of the wingtip. I used abackwards clamp (pushing out) to slightly extend the leading edge molding piecepast where it would intersect with the wingtip (so I would have some room tosquare and true up the wingtip) then used a thin japanese pull saw against theleading edge to cut the wingtip. Then took off the clamped on leading edge andfiled and sanded the wingtip flat and to length.The wingtip matched up to the leading edge perfectly. Then I clamped the leadingedge in place at many points, and used a plane to shape the end to blend withthe wingtip. thought it would have been exactly in the middle of the leadingedge, but it was about 1/3 from the top instead of 1/2, so I planed it twiceon the long side for every once on the short one. Did some rounding strokes tomake it all even and it came out well. Once it was approaching the size I thoughtit should be (about same size as the wingtip it was joining with) I usedthe japanese saw to cut the leading edge end to length, and then a fine file andsanding blocks to finish it up.Think it turned out well.Jim D.Read this topic online here:http://forums.matronics.com/viewtopic.p ... ttachments: http://forums.matronics.com//files/img0 ... ___Subject: Pietenpol-List: Re: Pietenpol aerobatics