Manufacturers of robust VTOL Bicopters for large payloads, precision hovers, and high speed flight.
" ... for the UAV market, [Gress] bicopters have big advantages over other platforms such as the quadcopters." - Model Helicopter World

Put a Gress bicopeter in outer space and it will still have full control about all three axes!
GREATER STABILITY, GUST TOLERANCE AND PAYLOAD WEIGHT:
We use propeller gyroscopics not only to enable pitch control but to enhance roll control as well - please see our Bi's in Space video at bottom left. They take control beyond what's possible with thrust changes alone (what quadcopters use) and pre-empt the effects of wind gusts. And this enhancement is independent of arm length. The result is:
- a bicopter of equal size carries heavier payloads
- bicopters are steadier in gusts.
HIGHER FORWARD SPEEDS, ALL WHILE REMAINING LEVEL:
Bicopers can be completely streamlined and, since only their propellers tilt, remain level in forward flight. This allows simpler, tighter camera installations - without view obstructions like extra propellers - which of course helps the aircraft stay streamlined.
In addition to using our own controllers, we now can adapt almost any quadcopter controller to a Gress Aero bicopter.
SO, UNLESS THEY ALREADY ARE, ASK YOUR UAV SOLUTION PROVIDER WHY THEY'RE NOT USING BICOPTERS!
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______________Gress Aeronautics, Toronto, ON, Canada. Tel: 647-386-3875__________