DronerX
lvl.2
Flight distance : 488192 ft
United States
Offline
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ImHereToCrash Posted at 2017-9-8 01:17
first off, i dont disagree about applying the winglets to the spark, i dont think anything wrong with them or that even unneeded they totally should be a thing on all dji's product offerings!. im just saying, the spark is by long and far quieter than the mavic pro. in my mind the mavic pro needed them more then the spark, but i could be wrong..maybe they make a bigger difference to the spark..
Winglets don't work on helicopters, etc. One of the best explanations I read is this - Helicopter rotors do not have a constant AoA; in fact it wobbles constantly about its lateral axis as a wing. As the helicopter blade moves forward, the AoA of the blade decreases, and as it moves back, the AoA increases, so that lift is balanced for the advancing and retreating blade. Even as they do that, the "sweep" changes constantly so that the rotor turns first faster than the blade advances and then slower than the blades retreats.
Winglets look cool and help a lot at a very certain flight regime and provide little benefit else-wise. They siphon energy off of the vortex and lean it "forward" a bit. It's kind of hard to explain without pictures, but suffice to say that a constantly changing AoA increases and then decreases the benefit of a winglet giving no net change, while probably increasing wetted area, blade momentum, and induced drag. |
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