![]() ![]() Like your fantastic vid, we might have to move that up the order because it's the best vid I've ever seen- touché' you only wish you didn't have to connect the strings on an end as they may have spiralled up like the first sim. But we'll stay with 2D to start with but always try to emulate something that is built and flying. Also, a good point that was made before things went off course was that the 3D modelling is going to be really interesting particularly at the root and tip where the air is forced in another direction. And on the other thread I did one run on the top foil.Īs you've already noted, all the magic in the KFM foils is happening in the transitional period of the flow ( you guys call it the separation bubble, same thing) so I think, at least, that's where the analysis will take us. For each run emulate the results on the MH site for easier comparison,ĭick actually picked all the foils. ![]() Initially varying Angles Of Attack (AoA),Ģ. 2D analysis of the 5 foils as determined by Dick. Unlike most C.F.D software packages that will effectively assess foils that are capable of being reproduced by differential equations, we have access to a significantly more complex suite of packages that have the ability to assess the unique 'step', or steps in the KFM family.ġ. Other well-known families are the Eppler & X-foil, the later being preferred by dagger boards in high performance yachting skiffs.Ī good database reference for a range of foils: which covers decades of experience and has a nice balance of maths theory and explanation in addition to 3 java applets, one of which allows extremely good, immediate analysis of a range of foils with all the 'heavy duty' variables there to play around with. Martin H (hence the - modified - Mh32 foil used in Roger's video) has a site: The most noted being the N.A.C.A profiles. To date, there are probably 5 - 10 families of foils that are recognised. Still all in all I'm VERY impressed with the results. The tape and wool bumps at our sizes tend to be thick enough that it alters the wing section Thinner wool and smaller tape patches would do much to prevent altering the test by adding the viewing aids. Perhaps get some darning wool instead of knitting wool so the effects of adding the wool and tape isn't so bumpy. Perhaps the KF angles suddenly reverse and act as a supply channel for air from near the fuselage? Again it would be cool to see a better view with teh PiP moved to some other spot. Then all at once ALL the threads stand up and angle FORWARD! That's sort of contrary to a usual stall bubble where I'd expect the flow near the wing to be LOW and forward and then it's picked up and rolled back along the high side of the separation bubble.
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