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1. 02:49 PM - GN-1 airfoil information (jimd)
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| Subject: | GN-1 airfoil information |
Hi,
Just had an A&I leave my house after looking over my biplane GN-1 project. He had
a concern about the landing gear placement of my plane, based on the weight/placement
of the engine.
To correctly determine where the gear should be he said I needed to find out where
the CG of the plane is, but with it being a biplane configuration, he said
that I needed to have the mean center of lift information for both the upper
and lower wings, as well as a number of measurements from the assembled plane,
like information about the spacing horizontally between the wings. Then once
the weights, and measurements are known, the acceptable range of locations for
the axle of the landing gear can be determined from some engineering formulas.
Did some searching, found two engineering articles on finding the CG/center of
lift on biplanes, and they require information about the airfoil.
I was able to find information on the Pietenpol FC-10 airfoil, which I believe
is what my lower wing has, as the Aerial biplane conversion plans say the airfoil
is the same.
http://www.airminded.net/piet/piet.html has piet airfoil info with Cl,Cm,Cd, type info.
However presuming my plane has the Gregga airfoil, which the plans say have a rounder
leading edge.. and which appear to be thicker.. I would think it is a different
airfoil, with different values. Have not seen it listed in the common
airfoils databases.
Anyone have information on the GN-1 airfoil? I have the plans, have a jig, and
wings, but only can guestimate it as being like the piet.
We are thinking I may have to rework the landing gear to get it right, but no one
knows how much if any it must be changed.
So any GN-1 ordinates, or the Cl,Cm,Cd type info, or naca airfoil numbers... anything
like that would be helpful.
You can see my gear/plane on the westcoastpiet site, its under Jim D.
Thanks,
Jim
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=182401#182401
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