![]() 20 hours of trying and testing to figure this out. By adding more positive angle, the extra positive AoA upwards-twisting force stabilized the blade, same as why many light-helicopter pilots find it easier to fly very slightly skewed to the wind, so the anti-torque force had something to balance it in fwd.flight. rounded point had warped since it was molded in China and also in the HOT transport/storage *pipeline" so that some were at 0° some actually slightly negative w.r.t. ![]() "delta" form (like the Star Wars Millennium Falcon) at the wrong AoA which here turned out to be critical. but these spare ones just bought (I run the fan for hours every day) had the rounded-point of the L.E. The blades are soft plastic for safety and can be heat adjusted. far outweigh theoretical airfoil shape including the builder/manufacturer's attempt to exactly copy the artificially tested airfoil.įor a few days now I have been improving the efficiency of several small cheap electric fans which I use (only one at as time) to cool my expensive laptop so the expensive-to-replace internal fan does not run. Lots of variables involved to get artificially tested results (wind tunnel, etc.) comparable to real-world actual model results (outdoor wind turbulence, humidity, altitude, temperature, etc.).įor models it is usually the case where pilot skill, proper trimming, light weight, etc. as a result of repeated and hopefully accurate testing. Some airfoils are good designed and have good performance in wide range of Re numbers.Īt the root of this: airfoils are not "designed", but drawn and/or arithmetically described and identified. This is exactly where I got some of the airfoils, however now I see that conclusions in this source are a bit subjective. You cannot really choose "best" airfoil without precisely specified set of wing dimensions and performance goals. This, and the fact that RE depends on chord so a good airfoil for the wing root is not necessarily a good one for the tip. The takeoff RE/cruise RE ratio of say 1:2 would be more realistic, I think. I'm still not too sure about the chosen Reynolds numbers. However, it would be best to first hear opinions of more knowledgeable people here. My only experience with aerodynamics-related journals is AIAA Journal, which is free to publish: Its not a peer-reviewed journal but still a good way to show your results to the scientific community. I haven't seen a comparison exactly like this so maybe is novel, besides it doesn't need to be some major breaktrough - presenting known facts in a new, insightful way has a value on its own. I think this all is well known? and If I were publish a paper what would be an appropriate journal?
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