BB Posted March 30, 2010 Share Posted March 30, 2010 I have just been given one of these. Looks a wee bit sprightly ! Does anyone know the CoG at the wing root ? Cheers, BB Quote Link to comment Share on other sites More sharing options...
Lee Smalley Posted March 30, 2010 Share Posted March 30, 2010 no idea but he old rule 30% of MAC allways works for my own designs Quote Link to comment Share on other sites More sharing options...
David Ashby - Moderator Posted March 30, 2010 Share Posted March 30, 2010 You won't go far wrong with that BB. as Lee says. Quote Link to comment Share on other sites More sharing options...
Marko Posted March 30, 2010 Share Posted March 30, 2010 Hello matey what" another "plane can't you share them around abit ha ha that would look nice in the boot of my car! What engine are you putting in it as for the c,g try 1/3 back from Leading edge and go from there pm me! Cheers ..............mark Quote Link to comment Share on other sites More sharing options...
BB Posted March 31, 2010 Author Share Posted March 31, 2010 Thought it was something like that - Cheers BB Quote Link to comment Share on other sites More sharing options...
Lee Smalley Posted March 31, 2010 Share Posted March 31, 2010 BB use MAC (mean aero chord) not just leading edge, there is a taper on the wing and as a result you should use MAC width of wing at root + width of wing at tip and then divide by 2 that gives your MAC and then 30% of that measure that back from leading edge at root its basic but its never let me down on my own designs (basic admittidly) ie root chord 10 inch, tip chord 6 inch MAC= 10+6/2 = 8 8 x 0.333 = 2.664 c of g 2.664 inch back from leading edge at root please convert to decimal in your own time Quote Link to comment Share on other sites More sharing options...
BB Posted April 6, 2010 Author Share Posted April 6, 2010 Mentioned in another thread. But to keep things 'more on topic, than not'. The Exclaim was maidened today in a S - SSW at 18.5 mph breeze. There is a problem with a previous repair to the left aileron. It had come away at some point and was repaired with an additional 1/8 gap between aileron LE & wing TE. Causing drag to the left. I'll repair it tonight, after some kip. C of G was a bit forward. But manageable. Adjustments to be made. Thanks Lee. I'm going to try that. See if it matches what I'm already thinking after todays maiden BB And YES twas a little sprightly !!Edited By Basildon Biggles on 06/04/2010 16:13:28 Quote Link to comment Share on other sites More sharing options...
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