Ed Cesnalis Posted May 30, 2018 Author Report Share Posted May 30, 2018 5 hours ago, ct9000 said: So is your need to keep the speed so high for other reasons like inertia to fight unexpected shear? 2 primary reasons, shear, excess energy for emergency canyon exit. Link to comment Share on other sites More sharing options...
FlyingMonkey Posted May 31, 2018 Report Share Posted May 31, 2018 On 5/29/2018 at 8:20 PM, Ed Cesnalis said: It was the other Andy that revealed that Vx was determined by comparing drag and available power profiles for each flap setting. The other Andy is an aerodynamicist. I am a hack. So if anything he said contradicts anything I've said, disregard my BS. ? Link to comment Share on other sites More sharing options...
Andy Posted June 3, 2018 Report Share Posted June 3, 2018 You, sir, are NOT a hack!! I'm constantly impressed with what you do. I'm not an aerodynamicist, per se, just got my degree in aerospace engineering a long time ago and love air and spaceflight. I'm still a student and am spending a lot of time studying aerodynamics in an effort to build some teaching materials that get it right (there's a lot of trash out there right now including the aero courses put out by AOPA and CAP). What we were talking about was aircraft performance which has an obvious heavy aero flavor. Would love to have some data on the CT airfoil and some CL vs AOA flap data but I've not been able to find it (though I did find one study I think is probably close) but, to be honest, I haven't taken the time to see if I could pry it out of the CT engineers. Link to comment Share on other sites More sharing options...
FlyingMonkey Posted June 3, 2018 Report Share Posted June 3, 2018 According to this article, the CT airfoil is a European C180 airfoil, if that helps. https://www.planeandpilotmag.com/article/flight-design-ct-best-of-the-lsas/#.WxRf9oopCf0 Link to comment Share on other sites More sharing options...
Andy Posted June 4, 2018 Report Share Posted June 4, 2018 Thanks. Already knew that and think it might correspond to the Eppler E180 airfoil at this website but am unsure if they are the same. http://m-selig.ae.illinois.edu/ads/coord_database.html Also, found this paper referencing it: https://www.researchgate.net/publication/295875067_Investigations_on_stability_and_control_characteristics_of_a_CS-VLA_certified_aircraft_using_wind_tunnel_test_data Link to comment Share on other sites More sharing options...
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