---------------------------------------------------------- KIS-List Digest Archive --- Total Messages Posted Thu 01/31/13: 1 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 05:10 AM - Re: KIS TR-1 Airfoil (Propellerjan) ________________________________ Message 1 _____________________________________ Time: 05:10:54 AM PST US Subject: KIS-List: Re: KIS TR-1 Airfoil From: "Propellerjan" 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 -------- www.jcpropellerdesign.com Read this topic online here: http://forums.matronics.com/viewtopic.php?p=393350#393350 Attachments: http://forums.matronics.com//files/35_63cuff_63a215_175.jpg ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message kis-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/KIS-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/kis-list Browse Digests http://www.matronics.com/digest/kis-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.