Jay Bunning Posted October 8, 2013 Report Share Posted October 8, 2013 Hi, I am doing some research for a training video on airfoils used on training helicopters (main and tail rotors). The emphasis is on Robinson helicopters, but I'd appreciate help from people with Enstrom & Schweizer experience. Robinson R22/R44 Main = Symmetrical, Tail = Asymmetrical Hughes/Schweizer Main = ???, Tail = ??? Enstrom Flacon/Shark Main = ???, Tail = ??? Any other small training helicopter? Many thanks for your time, Regards, J 1 Quote Link to comment Share on other sites More sharing options...
Astro Posted October 8, 2013 Report Share Posted October 8, 2013 From a picture of an old Brantly I'd say the main rotor was symmetrical, couldn't see the tail rotor. If I were a betting man, I'd say all of these trainers have symmetrical main rotor blades. As for the tail rotor, I guess it would depend on if they were designed before or after they realized asymmetrical blades are better for small tail rotors? Quote Link to comment Share on other sites More sharing options...
danr_657 Posted October 8, 2013 Report Share Posted October 8, 2013 If I remember correctly the S300 has symmetrical blades on both the main and tail. don't know how I remember that haven't touched one of those since 2009 but that seems to be what I remember tried finding the manual on the internet but couldn't find one Sikorsky keeps that stuff locked down they don't allow open usage like robinson does. not sure about the Enstrom never even seen one of those. Quote Link to comment Share on other sites More sharing options...
rubidug Posted October 9, 2013 Report Share Posted October 9, 2013 Yes, the 300C has both symmetrical main and tail rotor blades. If you would like to see some interesting blades, check out the Brantley B2B. It was used as a trainer as well (Lycoming 360). Quote Link to comment Share on other sites More sharing options...
pilot#476398 Posted October 9, 2013 Report Share Posted October 9, 2013 Yes, the 300C has both symmetrical main and tail rotor blades. If that's also true for the CB and CBi it may explain why their tail rotor authority sucks balls!? Quote Link to comment Share on other sites More sharing options...
iChris Posted October 10, 2013 Report Share Posted October 10, 2013 (edited) Hi, I am doing some research for a training video on airfoils used on training helicopters (main and tail rotors). The emphasis is on Robinson helicopters, but I'd appreciate help from people with Enstrom & Schweizer experience. R22/R44 Main: NACA 63-015 / Tail: NACA 63-415 300C Main: NACA 0015 / Tail: NACA 0014 Enstrom Flacon/Shark Main: NACA 0013.5 (NACA 0013) You’ll have to research additional manufactures data. You can go to the following site and find the technical name of an airfoil for a given helicopter (main rotor only): The Incomplete Guide to Airfoil Usage Then do a “Quick Search” for that airfoil at the following site. Then click its technical name for a description and figure of that airfoil. You can also use the "Browse" button on the right for alphanumerical technical names (browse by name). The Airfoil Investigation Database site Edited October 10, 2013 by iChris 3 Quote Link to comment Share on other sites More sharing options...
crashed_05 Posted December 6, 2013 Report Share Posted December 6, 2013 I almost forgot about NACA numbers...great reply. Quote Link to comment Share on other sites More sharing options...
brfuga32 Posted March 13, 2017 Report Share Posted March 13, 2017 Does anyone know what the Robinson R22 horizontal and vertical stabilizer NACA airfoils are? Quote Link to comment Share on other sites More sharing options...
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