Pitch-controlled Quad

[Protactin]

Hey guys!

Has anybody of you build something like this? Or do you think that might be a good challenge? wouldn't it be far better in terms of stability and agility if you don't have the motors to spin faster or slower when you are able to get a faster servo to get the work done? Turning could be possible by alternating the pitch of the CW and CCW propellers, so that the thrust is the same, but the higher outer resistance of the air should make the quad turn, or am I false with that?

Have a nice time all and hopefully no crashes

Something like THIS

 

[Snarls]

Not positive if anyone has scratch built one, but there are currently two of these types of quads on the market. The first was Curtis Youngblood's Stingray 500, and the second is Hobbyking's Assault Reaper. Both are marketed as 3D quads for their ability to fly like 3D helis. They are also slightly different in that they use one motor instead of four.

You did ask a good question about the efficiency of such designs, and I wonder how the efficiency of four motors with collective pitch would compare to one motor with collective pitch.

 

[Protactin]

as you need more gears and something like a drivetrain, the friction could be an issue with one motor, but one motor is also only one place where heat is generated instead of four. Because if you need 1kg thrust, it doesn't matter how much motors you have, the basic power will be the same, it only depends on those "energy leaks" like prodiced heat and friction.
But as you go on to a hex or an octacopter, you need the extra motors for the redundancy, if you only use one and something within the drivetrain is blocked, the thing will turn into a stone in midair.

 

[Tritium]

WL Toys has done a direct "COPY" of Youngblood's Stingray 500.

http://www.banggood.com/WLtoys-V383-500-Electric-3D-2_4G-6CH-RC-Quadcopter-p-954821.html

Thurmond