A Collective Pitch Quadcopter

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Quadcopters aren’t a new thing, but for all the advances in multi-rotor craft, they all still fall into the paradigm of, ‘stick a prop on a motor and repeat three more times. [Curtis Youngblood], one of the top RC heli pilots in the world, came up with a very cool drive system for a quad, requiring only one motor and granting each blade collective pitch that allows for absolutely insane acrobatic ability.

There’s only one motor inside the Stingray 500, as [Curtis] calls his new toy. It’s at the rear of this quad’s H-frame, attached to a shaft running down the spine with a pair of pulleys. All four rotors are driven by this spinning shaft.

Because [Curtis] is an acrobatic pilot, he needed a way to control his ‘copter in more than one direction. To do this, he added four servos on each arm of the quad, giving each rotor collective pitch, just like the tail rotor of a real helicopter. The result is a quadcopter that can fly upside-down with the greatest of ease, perform barrel rolls, and all the other maneuver a true 3D RC ‘copter can do.

The awesome guys at Flite Test had [Curtis] visit their hangar and had him do an awesome demo flight. You can check out that video below.

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Collective Pitch Thrust Vectoring on a RC Plane

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The RC plane shown above is hovering in that position. And that’s about the least impressive thing it can do. This is the power of Collective Pitch Thrust Vectoring… on a plane.

So what exactly is Collective Pitch Thrust Vectoring anyway? Put simply, it’s like strapping a helicopter rotor to the front of a plane. We think the basic mechanism behind this is called a Swashplate (as found on a helicopter rotor), which allows for thrust vectoring, meaning the propeller blades can actually change their pitch cyclically, while still spinning at high speeds! This is what allows helicopters to do crazy tricks like barrel rolls.

A normal RC plane can only increase or decrease thrust with the speed of the engine. But with this, the thrust can be changed cyclically as the blades spin allowing for thrust vectoring (advanced steering). Couple that with some huge control surfaces and wing stabilizers and that means some seriously crazy aerodynamic feats.

Watch the video after the break, it’s amazing.

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