There are some beautiful Quads on this post.
I use the same motors, same ESCs, same battery, FCB and same props on my Anycopter and my Knuckle Quad. Exactly the same parts. Both copters weigh 840 grams.
I notice that I get almost two minutes more flight time with the Anycopter and that I use less throttle to hover with the Anycopter than with the Knuckle H quad.
I have two theories on this and would like to ask for input.
One theory is that the Knuckle quad is smaller and the KK2 is making more adjustments to keep it level (I only fly with autolevel on at this point). I have tuned the KK2 on both copters and there are VERY minor differences in settings.
The other theory I have is that the AnyCopter's X shape puts only 4" of boom under my 8" props while the Knuckle H quad has the same 4" of boom but also has some 2" per rotor of the frame directly below the rotor. I think this causes the rotor to push down on a larger section of frame making the Knuckle H quad less efficient.
I mount my motors high on both copters to avoid rotors causing the booms to vibrate by creating an air pocket so the rotors are 3" - 4" above the booms and the distance is consistent between the copters.
I am thinking of re-building the Knuckle H quad by placing the center rails of the frame together (so they touch) and placing the hub on top of it so that the center of the copter is not enclosed on the sides by the 1/2" rails. This rebuild will remove all the center rails from under the rotors. Since I put my wiring and ESCs between the plates, this also allows for airflow to hit the ESCs from the outside edges.
Thoughts?
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