Brodhead Pietenpol Association

Original Posted By: "Mike Whaley"
Today while building my rib jig, I was plotting points according to Wing Plan (3/3/34)in the "Measurements of Wing Rib Profile" section (top). The tip of theLE is 1 1/2" up from the baseline. The second vertical is back 1/2" from thetip of the LE but no measurement is given from the baseline. Do you just eyeballit and do a manual curve fit based on the other points? Doesn't make sensethat you would guess at it if other dimesions are given to the nearest 1/64"(the tip of my pencil is wider than that) It's a point in an area with alot of bend so I don't like guessing. Also one drawing shows the total rib lengthof 60" but if you add up all the individual measurements for the verticalsit comes out to 60 1/8". Am I quibbling?I read through the archives and didn't see anything on this but found another articleregarding the 3/3/34 Plan profile being different than the full sized ribprofile. Which do you go with?Thanks in advance,Glenn________________________________________________________________________________

Original Posted By: "tmbrant1(at)netzero.com"
Hi Glen..Welcome to Pietland..The wing chord is 60". If you try to do stuff like expecting the individual dimensions to add up to the total length you will just make yourself crazy. I don't remember the second verticle measurement being missing, I can check my plan set for you when I get home tonite or maybe someone else can get it for you sooner if it is there. If you plot the dimensions out you will find that there is a low spot ( about 1/8") near the aft third of the upper cap strip. I plotted the points on a piece of plywood and then drove a small nail partially into the wood at each plotted point. Then I bent a 1/8" hardwood strip over the nails and ran a pencil line along it to connect and average the points. There are lots of Piets out there flying just fine with minutely different wing rib profiles. Save your rib jig incase you ever need to replace a rib. I didn't use a full size rib profile but I hear they are undependable because of the expansion and contraction of the paper due to humidity changes. hope this helps...Ed G.>From: "Glenn Thomas" >Reply-To: pietenpol-list(at)matronics.com>To: >Subject: Pietenpol-List: Wing Rib Profile Measurements>Date: Sun, 8 Jan 2006 20:12:17 -0500>>Today while building my rib jig, I was plotting points according to Wing >Plan (3/3/34) in the "Measurements of Wing Rib Profile" section (top). The >tip of the LE is 1 1/2" up from the baseline. The second vertical is back >1/2" from the tip of the LE but no measurement is given from the baseline. >Do you just eyeball it and do a manual curve fit based on the other points? > Doesn't make sense that you would guess at it if other dimesions are >given to the nearest 1/64" (the tip of my pencil is wider than that) It's >a point in an area with a lot of bend so I don't like guessing. Also one >drawing shows the total rib length of 60" but if you add up all the >individual measurements for the verticals it comes out to 60 1/8". Am I >quibbling?>>I read through the archives and didn't see anything on this but found >another article regarding the 3/3/34 Plan profile being different than the >full sized rib profile. Which do you go with?>>Thanks in advance,>Glenn________________________________________________________________________________

Original Posted By: "Bill Church"

Original Posted By: "Glenn Thomas"
William has posted an update on his website, at http://www.flycorvair.com/hangar.html . Those who have waited for parts that you've ordered from him will be happy to read that he now has someone full-time on the phone in his shop and is re-focusing 2006 more on production of parts than on promotional events.There is also mention of his newest video, on engine disassembly.Oscar ZunigaSan Antonio, TXmailto: taildrags(at)hotmail.comwebsite at http://www.flysquirrel.net________________________________________________________________________________Subject: Pietenpol-List: Re: Wing Rib Profile Measurements

Original Posted By: "Bill Church"
Thanks Ed, Bill and Lou for giving me ideas on approaching this one. Tonight I'llforge on with the jig.Thanks!GlennRead this topic online here:http://forums.matronics.com/viewtopic.p ... ___Subject: Pietenpol-List: Re: Wing Rib Profile MeasurementsDate: Tue, 10 Jan 2006 16:09:40 -0500

Original Posted By: "walt evans"

Original Posted By: "Bill Church"
Bill,I've seen your rib jig on mykitplanes.com. If you wanted to stay true tothe plan you could just make a couple of extra ribs out of 3/16" capstripand shim your jig with 1/16" pieces. Wouldn't that work? You couldvisually check trueness to the profile since it's drawn onto the jig. I'mglad you mentioned it, because I probably wouldn't have noticed it until Iget to where you are.Thanks,Glenn----- Original Message -----

Original Posted By: "Jack T. Textor"

Original Posted By: "Bill Church"
Bill...I bought my Piet as a project. The original builder used 1/4" cap strips and I was unwilling to have a bulge at the wingroot. I stiffened the end ribs by gluing 2 pieces of spruce, about 1"X 5/16 edgeways to the ribs, top and bottom. The spruce reinforcements are cut a little longer than the distance between the spars, so that they bow slightly, although no attempt was made to conform them to the airfoil. The spruce strips were epoxied to each of the gussets that they touched along the length of the rib. This appears quite stiff, doesn't add much if any weight and makes the fabric nice and smooth....Carl----- Original Message -----

Original Posted By: Irwin Fust
I didn't want to mess with shimming the jig and takeing a chance on something getting misaligned so I made standard thickness ribs with slightly wider capstrip and cut a recess in the capstrips for the plywood after the ribs were completed using my router table. It was a little extra work but it came out nice and its a little stronger rib for the fabric to pull against. Walt's way sounds alot easier and faster but you asked how different people have done it so there ya go...Ed G.>From: "Jack T. Textor" >Reply-To: pietenpol-list(at)matronics.com>To: >Subject: RE: Pietenpol-List: Re: Wing Rib Profile Measurements>Date: Tue, 10 Jan 2006 17:09:28 -0600>>>>Walt can you share some of the things you would have done different?>Thanks,>Jack Textor>Des Moines>www.textors.com>>.net>>>I just put the ply over the standard rib of 1/4" thk.>You don't see it at all.>Of the few things that I look over and wish I'd done different,,,that's>not>one of them.>walt evans>NX140DL>>________________________________________________________________________________

Original Posted By: harvey rule