Pietenpol-List: spar/rib jigging

matronics · Post by **matronics** » Mon Mar 24, 2003 12:47 pm

Original Posted By: "walter evans"
Hello, Pieters-In looking at the wing cross-section in CAD and with the supplied full-scale rib drawing from Mr. Pietenpol, I'm missing something. Taking the bottom of the front wing spar as a reference and using the face of the spar as vertical and perpendicular to the reference, if you keep the faces of both spars parallel to each other it seems that the bottom of the aft spar is about 3/16" higher than reference to maintain the airfoil profile given.I need to go back to Mike Cuy's video and photos to take a look at his wing construction and jigging, but when laying out the wings, does that mean that the aft spar is jigged about 3/16" higher than the front spar when the ribs are slid on? The ribs are constructed with the spar slots parallel to each other and if the spars are jigged with their bottom edges at the same level, the ribs would have to deform slightly to keep the spars parallel.One other, minor issue- the original plans show the fuel tank in the center section to be about 10 gal. but in CAD it doesn't seem to have that much volume. Has anyone built a tank to the profile shown in the plans and checked the volume?Oscar Zuniga (keeping my political views to myself, but everyone is entitled to my opinion!)San Antonio, TXmailto: taildrags(at)hotmail.comwebsite at http://www.flysquirrel.net________________________________________________________________________________

matronics · Post by **matronics** » Mon Mar 24, 2003 4:10 pm

Original Posted By: "Oscar Zuniga"
Oscar,I can only vouch for the tank size. built the three piece wing to plans,and built the tank to the shape it shows in the little sketch. It fitsnicely in the spot and it is exactly 10 gals. this is with me not countingon my tank top being perfect, so I ran about 1/2" under the top contour. Atop layer of very thin aluminum (Home Depot) was added on top for finalcontour. Even could have squeezed some more out of the size if I needed.walt----- Original Message -----

matronics · Post by **matronics** » Mon Mar 24, 2003 4:26 pm

Original Posted By: "D.Dale Johnson"
Subject: Re: Pietenpol-List: spar/rib jigging