Brodhead Pietenpol Association

Original Posted By: Tim Willis
er23(at)gmail.com>> > >> > > A couple of questions about the gussets on the wing ribs....> > >> > > I have the full size rib print, although I didn't use it to layout > > the jig. I'm cutting pieces of thin cardboard to match the gussets as > > shown on the full size print, and then I'll use those patterns for > > cutting gussets from the sheet of 1.5mm birch ply we bought from AS&S. > > Are there any discrepancies in the gussets as shown on the full size > > print?> > >> > > The top gusset on the rear spar upright is a rather odd shape, > > insofar as how it extends down the 45 degree rib member. I wonder if > > it would be better to just extend it out to be a full square so it > > might be a little stronger. Of course, then I look at it and think > > that if it needed to be that way then it would have been drawn that > > way. > > >> > > Otherwise I think I've found most of the posts on the other things > > to be careful of: scuffing the birch before gluing, cut the gussets > > out so you have vertical grain orientation. I was thinking of using > > weights on the gussets and leaving the rib in the jig overnight to > > dry. Stapling (and removing the staples later) sounded good as well, > > speeding up the process, but I worry about having the gusset shift > > when the staple is driven in. Is this a concern?> > >> > > Thanks for the help,> > >> > > Ryan> > >> > >> > >> > >> > > Read this topic online here:> > >> > > http://forums.matronics.com/viewtopic.p ... 454#180454> > >> > >> > >> > >> > > ====> > >> > >> > >> >> >> > ------------------------------------------------------------------------> > Email Australia. Be part of history. Take part in Australia's first > > e-mail archive w=======================> > >_________________________________________________________________It's simple! Sell your car for just $30 at CarPoint.com.aue%2Ecom%2Fcgi%2Dbin%2Fa%2Fci%5F450304%2Fet%5F2%2Fcg%5F801459%2Fpi%5F1004813%2Fai%5F859641&_t=762955845&_r=tig_OCT07&_m=EXT________________________________________________________________________________Date: Thu, 1 May 2008 10:40:34 -0500 (GMT-05:00)

Original Posted By:ject: Pietenpol-List: Gusset questions> > > rmueller23(at)gmail.com> > >
Hi MikeI'm not the best qualified to comment, but I understand that the Riblett 612 profile gives better rate of climb, gentler stall characteristics and is so close to B Pietenpol's original curve that only the most informed will be able to notice the difference. There are many more on this list who are much better able than I to expound the benefits of the Riblett design; I invite them to do so.The reference coordinates of the various profiles have recently been posted on the list by a friend and colleague, John Woods, for anyone who is interested in looking at the various options.At least two of us in Perth are using the Jim Wills wing design, allowing an increase in MTOW to 1200#. With the 612 profile this should realise a more versatile aircraft, particularly with 2 up. Incidentally, this is the reason why some of us will be covering both top and bottom leading edges, back to the aft edge of the front spar, with ply. The enclosed D section this creates dramatically increases the strength of the wing, allowing the increased MTOW from the original design.CheersRobtenpol-list(at)matronics.com> Subject: Re: Pietenpol-List: Gusset questions> >pe.net>> > Rob,> What is the advantages of the Riblett aerofoil ?> Pastor Mike in Iowa> > Rob Hart wrote:> > Hi Ryan> > > > You echo concerns I had only a week or so ago. I am using the Riblett > > aerofoil (as are a number of us "Down-Under" Piet builders), and so > > the gusset shapes may be a little different.> > > > I cut a full size rib as a template for the capstrips, braces and > > gussets. I cut my gussets from 1 3/16" strips of 1.5mm ply. Given 32 > > ribs, each requiring gussets on both sides, I needed 64 gussets at > > each station. Using the template gusset as a guide, I stacked 11 > > strips of ply, and cut 6 gussets from each stack on the bandsaw, > > giving 66 gussets for each station.> >> > To avoid the need for staples/nails, I made up 20 weight blocks from > > 1" steel bar. Each block is 1 1/2" long, cleaned up on the lathe, and > > wrapped with plastic tape so it doesn't stick to the gusset. Just > > place each block on the gusset as it is glued, ensuring the gusset > > doesn't slide. I'm using West Systems with its proprietary filler, to > > give a nice thixotropic glue similar to Techniglue but with more > > control over the viscosity. The blocks provide sufficient pressure to > > ensure full surface contact, but avoiding glue-starved joints caused > > by over-clamping.> > > > When gluing the starboard side gussets, having sanded the capstrips > > flush, I used cut sections of 40mm pvc pipe as claps, with the rib > > raised off the bench on 1X1" timbers (left over from the mockup I built).> > > > More details, if you're interested, at > > http://www.mykitplane.com/Planes/buildL ... laneID=503 > > > > > > > > Cheers> > > > Rob> > > > Piet building in Perth, Western Australia> >> >> >> > > > ------------------------------------------------------------------------> >> > > Sub