T E A M
Erm...., i did read about the kf airfoils...
only proven that works speed under a certain limit, my guess is around 100km/h. Its only efficient at lower speeds. But then your wing could fly at a higher angle of attack without stalling compared to commonly used airfoils.
(I didn't really test this out but i read it over the internet)
well...no harm trying a new type of airfoil, just give it a shot!
Here are some reviews i found from the internet:
This is my son's flight review: This thing flies amazingly well! The slow flight characteristics are very nice, it flies VERY slow and the wing does not appear to tip stall at very slow speeds. When I pulled power off and held full up elevator, it maintained a steep glide with a slightly nose-up attitude, and again, the ailerons had good authority throughout. Knife edge flight was easy and there was little coupling. All that was required was a little down elevator to fly knife edge straight. She hovers easily. The ailerons seemed to have more authority than normal in the hover, but I'll have to fly it more to be sure. Entering flat spins (both normal and inverted) was very easy, and the aircraft had exceptional aileron control (especially inverted) and was very nice throughout. Also, for flat spins, the forgiving nature of this design makes "bailing out" of these maneuvers very easy. Likewise, maneuvers like waterfalls and so on are quite stable. The rudder on this plane allows me to "whip" the tail around and perform many of the other more radical things, but this also flies much more like a "real" plane. The KFm wing seems to let this plane "groove" much more like some of the larger nitro birds I've flown (like the Kaos), while simultaneously giving me the best of the foamies (namely amazing slow flight and ease of use). The most striking thing for me is how quickly this plane can go from fast "grooving" flight to very stable slow flight. Obviously these are just my first impressions, but as I spend more time flying I'll be sure to update you on its performance.
Another follow up review: I have flown the Regal a couple times now since my last post and I am still very happy with how well this plane flies and with how good it looks in the air. The KFm wing is fabulous for sport/3D flying! Because it is very forgiving at slow speeds it is a blast to fly low and slow both upright and inverted. Also, this plane will snap roll, which is something some of my other foamies were incapable of doing.
Normally I have found that half throttle gives me a good speed for just flying around, and it hovers around 3/4 stick. (Of course there is unlimited vertical performance at full throttle)
Taken from : http://www.wattflyer.com/forums/showthread.php?t=22654
only proven that works speed under a certain limit, my guess is around 100km/h. Its only efficient at lower speeds. But then your wing could fly at a higher angle of attack without stalling compared to commonly used airfoils.
(I didn't really test this out but i read it over the internet)
well...no harm trying a new type of airfoil, just give it a shot!
Here are some reviews i found from the internet:
This is my son's flight review: This thing flies amazingly well! The slow flight characteristics are very nice, it flies VERY slow and the wing does not appear to tip stall at very slow speeds. When I pulled power off and held full up elevator, it maintained a steep glide with a slightly nose-up attitude, and again, the ailerons had good authority throughout. Knife edge flight was easy and there was little coupling. All that was required was a little down elevator to fly knife edge straight. She hovers easily. The ailerons seemed to have more authority than normal in the hover, but I'll have to fly it more to be sure. Entering flat spins (both normal and inverted) was very easy, and the aircraft had exceptional aileron control (especially inverted) and was very nice throughout. Also, for flat spins, the forgiving nature of this design makes "bailing out" of these maneuvers very easy. Likewise, maneuvers like waterfalls and so on are quite stable. The rudder on this plane allows me to "whip" the tail around and perform many of the other more radical things, but this also flies much more like a "real" plane. The KFm wing seems to let this plane "groove" much more like some of the larger nitro birds I've flown (like the Kaos), while simultaneously giving me the best of the foamies (namely amazing slow flight and ease of use). The most striking thing for me is how quickly this plane can go from fast "grooving" flight to very stable slow flight. Obviously these are just my first impressions, but as I spend more time flying I'll be sure to update you on its performance.
Another follow up review: I have flown the Regal a couple times now since my last post and I am still very happy with how well this plane flies and with how good it looks in the air. The KFm wing is fabulous for sport/3D flying! Because it is very forgiving at slow speeds it is a blast to fly low and slow both upright and inverted. Also, this plane will snap roll, which is something some of my other foamies were incapable of doing.
Normally I have found that half throttle gives me a good speed for just flying around, and it hovers around 3/4 stick. (Of course there is unlimited vertical performance at full throttle)
Taken from : http://www.wattflyer.com/forums/showthread.php?t=22654
...but no matter how bad some of them were, ...cannot compare with the China CS engines ...that one so bad, we started calling them Chicken Shit (CS) engines. 
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