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1. 05:10 AM - Re: KIS TR-1 Airfoil (Propellerjan)
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Subject: | Re: KIS TR-1 Airfoil |
Mark and all,
After I got the GA-35 and 37 A215 typed in and checked in 3 airfoil program, I
got to this conclusion:
Can not trust any program to 100 %, we can see differences though, and they are
all the same in the different programs, Xfoil seems to be more sensitive for
un-even coordinates, but good thing is the polars can be zoomed in and out.
I found the erratic in Cm on the N-63A215 airfoil in Xfoil to be due to the last
half% of the chords coordinates was making a cone to almost zero thickness,
when corrected to have some thickness as the other airfoils that erratic Cm curve
(moment) was almost gone, the other programs like DesignFoil and JavaFoil
don't seem to be so sensitive.
What I can see is that the GA35A215 will have the lowest drag, specially at climb,
the GA-37A215 will have little higher max CL.
The GA- airfoils have a little rounder/softer stall.
The Half-Cuff will help on the N-63A215 as it seems, but have to be tested in real
world.
Jan Carlsson
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www.jcpropellerdesign.com
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=393350#393350
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