Brodhead Pietenpol Association

Original Posted By: Jim Markle
In the layout of a 612 rib template I am not sure what to use as a vertical referencefor the spar. Should it be 90 degrees from the cord line or 90 degreesfrom the bottom wing surface????????I believe this would also affect the angle of incidence.Thanks! You all make this a great place to exchange info!Read this topic online here:http://forums.matronics.com/viewtopic.p ... ______Date: Thu, 19 Nov 2009 08:11:23 -0500 (GMT-05:00)

Original Posted By: Ameet Savant
Subject: Re: Pietenpol-List: rib/spar orientation

Original Posted By: "ivan.todorovic"
Peter,Please check if I've messed the dimensions for the front spar on the drawings below.Maybe it is a stupid question, but better safe than sorry: spar face with fullplywood web goes in the wing-tip direction for both spars, front and rear, right?There is a small drawing near the right edge of your sketch that made me uncertainabout that.One other thing: vertical stiffeners position on the spar inside edge would needa hint or two, there are several dimensions (7 1/2), (1/2 + 8 1/2) that area bit confusing.Regards,IvanRead this topic online here:http://forums.matronics.com/viewtopic.p ... ttachments: http://forums.matronics.com//files/fron ... ___Subject: Pietenpol-List: Re: rib/spar orientation

Original Posted By: Oscar Zuniga
The spars won't care if they are a few degrees one way or the other. But if you happened to get the rib lay-out from the Pietenpol family, it shows where those uprights are intended to be. However, the strength of the wing isn't very sensitive to that angle, as long as it's not too far off.Just to be clear, I'm talking about the angle of the spar with regard to the chord or the bottom of the wing. I'm not talking about the angle of incidence.David Paule> >> I used the 90 Deg, from the cord line as Mr R. suggested..... ________________________________________________________________________________