Original Posted By: Jim Ash
About a year ago when I priced it from both Wicks and Aircraft Spruce, the cost of the 1/2" center with four 1" x 1/4" capstrips was more than the cost of the solid spars, so I went solid and routed. Of course, the plywood center web may be cheaper, I did not price that. One question I could never get a good answer to is how/where the proper splices would be (building a one-piece wing). I would think that they could be anywhere as long as they were staggered. Of course, this would not be a problem if building a 3-piece where all of the components could be full length without splices. I like the built-up spars, the examples on here are beautiful, but cheaper and more original won out.Unfortunately, I did not weigh before and after routing, but I can tell you that the weight saving is substantial, not miniscule as some on here have suggested. Pietenpol says 25% and I think that is probably right. If it is wrong, it is low.Gene________________________________________________________________________________Date: Sat, 13 Mar 2010 11:06:12 -0500 (GMT-05:00)
Re: Re: Pietenpol-List: 1/2" web
Re: Pietenpol-List: Rib Stitching Tail Surfaces
Original Posted By: "Skip Gadd"
Bingo!Strength in tension is often less if the tension is in "peel," which it is for fabric covering.David Paule> > These surfaces are in the propwash and subject to piles of vibration. I'm not familiar with the Stewart System (I've done Polyfiber), but I'd be inclined to think a glue joint would be naturally better in compression and shear than in tension (I don't really know if this is a valid assumption - Does anybody here have experience with analysis of the strengths of adhesives?). Stitching is primarily about tension.________________________________________________________________________________
Bingo!Strength in tension is often less if the tension is in "peel," which it is for fabric covering.David Paule> > These surfaces are in the propwash and subject to piles of vibration. I'm not familiar with the Stewart System (I've done Polyfiber), but I'd be inclined to think a glue joint would be naturally better in compression and shear than in tension (I don't really know if this is a valid assumption - Does anybody here have experience with analysis of the strengths of adhesives?). Stitching is primarily about tension.________________________________________________________________________________
RE: Pietenpol-List: Rib Stitching Tail Surfaces
Original Posted By:
Malcolm,Rib stitching is not only about holding the fabric to the ribs, but also aboutholding the top cap strip together with the bottom cap strip. This is very importantwhen talking about a truss built rib. Not really sure about the tail surfaces,but I will be stitching mine.Skip----- Original Message -----
Malcolm,Rib stitching is not only about holding the fabric to the ribs, but also aboutholding the top cap strip together with the bottom cap strip. This is very importantwhen talking about a truss built rib. Not really sure about the tail surfaces,but I will be stitching mine.Skip----- Original Message -----
Pietenpol-List: Rib Stitching Tail Surfaces
Original Posted By: Ben Charvet
RE: Pietenpol-List: Rib Stitching Tail Surfaces
Original Posted By: owner-pietenpol-list-server(at)matronics.com
I stitched mine. Good practice for doing the wings.Jack PhillipsNX899JPRaleigh, NC _____
I stitched mine. Good practice for doing the wings.Jack PhillipsNX899JPRaleigh, NC _____
Re: Pietenpol-List: Rib Stitching Tail Surfaces
Original Posted By: helspersew(at)aol.com
Re: Pietenpol-List: Rib Stitching Tail Surfaces
Original Posted By: Rick Holland
Good insurance to stitch them. That tail surface fabric does drum a lot. Onlya few hours worth of work.Don EmchNX899DERead this topic online here:http://forums.matronics.com/viewtopic.p ... ______Date: Sat, 13 Mar 2010 19:42:17 -0500Subject: Re: Pietenpol-List: Rib Stitching Tail Surfaces
Good insurance to stitch them. That tail surface fabric does drum a lot. Onlya few hours worth of work.Don EmchNX899DERead this topic online here:http://forums.matronics.com/viewtopic.p ... ______Date: Sat, 13 Mar 2010 19:42:17 -0500Subject: Re: Pietenpol-List: Rib Stitching Tail Surfaces
Pietenpol-List: Rib Stitching Tail Surfaces
Original Posted By: Lawrence Williams
RE: Re: Pietenpol-List: 1/2" web
Original Posted By: owner-pietenpol-list-server(at)matronics.com
I routed my rear spar. Both my spars are =BE=94 but the rear spar I routed downto =BD=94 thick in the middle. I calculated the weight savings and confirmed itby weighing the spars before and after. The weight savings was 1.89 lbsjust for the two rear spars. For a 1=94 spar the savings would besubstantial.Jack PhillipsNX899JPRaleigh, NC _____
I routed my rear spar. Both my spars are =BE=94 but the rear spar I routed downto =BD=94 thick in the middle. I calculated the weight savings and confirmed itby weighing the spars before and after. The weight savings was 1.89 lbsjust for the two rear spars. For a 1=94 spar the savings would besubstantial.Jack PhillipsNX899JPRaleigh, NC _____