Pat Russo wrote: > Where can I get the co-ordinates for the "other airfoil"? And, which one > will yield 10MPH more..and again, with spars already done per KR plans do > they need to be re-done for the different foil or simply modified?
The AS504x airfoil info is at http://www.krnet.org/as504x/, along with a link to coordinates and templates at the bottom. There's is no airfoil template that has been scaled down to KR1 size (yet), so the simple way to do it would be to reduce them by the correct percentage on a big copier like they have at Kinko's, or print them scales on a plotter. The spar locations would probably need to be redrawn, and that could be done by hand on the plots pretty simply, by simply knowing the depth of the spars and drawing them in parallel to the KR2S spars, but moved to correspond with the KR1 spar locations (or depth). All three versions will improve speed and efficiency about the same amount. Read the instructions to decide which is best for you, but for new construction, the 18% root tapering to 15% tip would be my choice, which is called the AS5048/45 on the download page. Now that I've read that page again for the first time in several years, there are a lot of warnings regarding "untested" templates, which certainly isn't correct now, that I need to fix. They definitely work, and no nasty habits have been reported, as expected. Looks like the naysayers were wrong again... Mark Langford N56ML "at" hiwaay.net website at http://www.N56ML.com --------------------------------------------------------
