Its easy to measure the AoA on the ground ..... measure vertically up from level ground (hardstanding is best) to the centre of the centre section LE and to the centre of the centre section TE. Divide the difference by the wing chord and that is the sine of your at rest AoA. For a tailwheeler its pretty close to the touch down AoA (excepting landing gear spring compression). One of mine is about 13 degrees, the other about 7. ... both tailwheelers! (if you drop a plumb line down to the floor from the LE and the from the TE, and use that distance instead of the wing chord, the figure you get is the tangent of the AoA .....
By the way, from that, if you know your stall speed, you can guess your touchdown speed in a three pointer ... its stall speed x sqr root(stall speed coefficient of lift / touch down Coefficient of lift) .. Cheers! Martin Martin Pearce - KR2 with Subaru EA81 + KR2 S with GMH Saturn - Both in my garage, neither registered or flying in Au ---yet! rocketdri...@optusnet.com.au -----Original Message----- From: krnet-boun...@mylist.net [mailto:krnet-boun...@mylist.net] On Behalf Of krnet-requ...@mylist.net Sent: Thursday, 7 April 2011 11:32 AM To: kr...@mylist.net Subject: KRnet Digest, Vol 353, Issue 97 Send KRnet mailing list submissions to kr...@mylist.net To subscribe or unsubscribe via the World Wide Web, visit http://mylist.net/listinfo/krnet or, via email, send a message with subject or body 'help' to krnet-requ...@mylist.net You can reach the person managing the list at krnet-ow...@mylist.net When replying, please edit your Subject line so it is more specific than "Re: Contents of KRnet digest..."
