AirTalk.org Aviation discussions newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  Re: Blunt Trailing Edges          AirTalk.org Forum Index -> Aviation (Aerobatics) View previous topic :: View next topic   Author Message djpacro Guest Posted: Mon Aug 01, 2005 5:20 am    Post subject: Re: Blunt Trailing Edges Go to the NACA report server and search for airfoil trailing edge. http://naca.larc.nasa.gov/ Different airfoil sections but you should see the origins of claims for improved lift curve slope, control effectiveness and changes to hinge moments. Back to top tempest@sympatico.ca Guest Posted: Thu Feb 09, 2006 2:07 am    Post subject: Re: Blunt Trailing Edges here is what I have read somewhere. Blunted trailing edges on the wings such as are found on the Extra series of aircraft where I believe this practice was first undertaken cause a delay in the stall. Something to do with the turblence and the associated vacuum causing a delay in separation. To the best of my knowledge the idea was explored in Germany during the 40's(?). Having looked at these aircraft up close these blunted trailing edges are 1/4 thick at most and I gather their effect is significant or I suspect Mr. Extra would have done something else. Cheers .......... ) wrote: Quote: Hi All, Many modern aerobatic aircraft have blunt trailing edges on the wing and ailerons. Can someone tell me: 1. Why it this done - what are the benefits and side effects. There is a lot of contradictory information on the web and I simply cannot get to the bottom of it. 2. What is theory behind it (a technical explanation please - I am an aero engineer and understand aerodynamics and stability and control etc). 3. Who was the first to do it. I have looked in all kinds of text books on stability and control and none of them address the issue. This type of trailing edge appears to be unique to aerobatic aircraft. Thanks, Steve Back to top Markus Feyerabend Guest Posted: Thu Feb 09, 2006 6:45 pm    Post subject: Re: Blunt Trailing Edges Thanks for the update! Last summer I had the chance to have a look at the SP-55 up close and the trailing edges of all flying surfaces where extremely thick. From 1/4 inch on the wingtip (or elevator/rudder) to more than 1 inch on the wing root. I was wondering what this is for and the russian engieneer I asked couldn´t answer... Cheers <tempest (AT) sympatico (DOT) ca> schrieb im Newsbeitrag news:MtxGf.4316$J%6.249690 (AT) news20 (DOT) bellglobal.com... Quote: here is what I have read somewhere. Blunted trailing edges on the wings such as are found on the Extra series of aircraft where I believe this practice was first undertaken cause a delay in the stall. Something to do with the turblence and the associated vacuum causing a delay in separation. To the best of my knowledge the idea was explored in Germany during the 40's(?). Having looked at these aircraft up close these blunted trailing edges are 1/4 thick at most and I gather their effect is significant or I suspect Mr. Extra would have done something else. Cheers Back to top Scott Rodriguez Guest Posted: Fri Feb 17, 2006 4:23 pm    Post subject: Re: Blunt Trailing Edges I believe this helps with rapid centering of the control, minimizes control surface overshoot, and allows the pilot to "feel" the center better. <tempest (AT) sympatico (DOT) ca> wrote Quote: here is what I have read somewhere. Blunted trailing edges on the wings such as are found on the Extra series of aircraft where I believe this practice was first undertaken cause a delay in the stall. Something to do with the turblence and the associated vacuum causing a delay in separation. To the best of my knowledge the idea was explored in Germany during the 40's(?). Having looked at these aircraft up close these blunted trailing edges are 1/4 thick at most and I gather their effect is significant or I suspect Mr. Extra would have done something else. Cheers ......... ) wrote: Hi All, Many modern aerobatic aircraft have blunt trailing edges on the wing and ailerons. Can someone tell me: 1. Why it this done - what are the benefits and side effects. There is a lot of contradictory information on the web and I simply cannot get to the bottom of it. 2. What is theory behind it (a technical explanation please - I am an aero engineer and understand aerodynamics and stability and control etc). 3. Who was the first to do it. I have looked in all kinds of text books on stability and control and none of them address the issue. This type of trailing edge appears to be unique to aerobatic aircraft. Thanks, Steve Back to top Display posts from previous: All Posts1 Day7 Days2 Weeks1 Month3 Months6 Months1 Year Oldest FirstNewest First         AirTalk.org Forum Index -> Aviation (Aerobatics) All times are GMT Page 1 of 1   Jump to: Select a forum Aviation----------------alt.aviationAviation safety EnhancementPlanes, gliders and flying in AustraliaAviation et pilotage (Français)rec.aviationAviation (Aerobatics)Hot air, gas balloons and airshipsHang-gliding, paragliding, foot-launched flightAircraft Design & BuildingInstrument Flight RulesAviation (Classifieds)Military AircraftNaval AviationAviation (Miscellaneous Topics)Owning AirplanesAviators (General Discussions)Aviation related productsAircraft RestorationHelicopters and rotary wing aircraftsFlight SimulationSailplanesAviation (Students)Light aircraftFlying related activities in the UK Airports----------------alt.airportsEdinburgh Airport Glasgow Airport Humberside Airport Luton Airport Aberdeen Airport Glasgow Prestwick Airport  You cannot post new topics in this forum You cannot reply to topics in this forum You cannot edit your posts in this forum You cannot delete your posts in this forum You cannot vote in polls in this forum Powered by phpBB © 2001, 2006 phpBB Group SEO toolkit © 2004-2006 webmedic.