11, is a flying-wing tailsitter design with a four-point landing wheel configuration, powered by twin, counter-rotating propellers
on its nose.
Penta comprises of steerable underwater drive unit with two forward-facing counter-rotating propellers
An open rotor engine generates most of the thrust from two counter-rotating propellers
instead of a ducted fan.
An unmodified Beech B60 Duke does not have counter-rotating propellers
In spite of the fact that the motor drives the counter-rotating propellers
via a planetary reduction gear (for optimal low-speed operation) both the motor and the transmission are mechanically insulated from the frame by rubber mounts.
Hanging from two huge counter-rotating propellers
, the Pogo had no trouble rising vertically or transitioning to normal horizontal flight during its 1951-1955 flight testing program.
The flying robot uses two counter-rotating propellers
powered by an ultra-thin ultra-sonic motor, said Epson, and balances in mid air by using a linear acuator-based stabilizer.
Conventional autonomous undersea vehicles, with their streamlined fore-and-aft geometries, are driven by either a single propeller or two counter-rotating propellers
VMC, CRITICAL ENGINES AND COUNTER-ROTATING PROPELLERS
Counter-rotating propellers are generally seen as the "fix" for [V.
In a single-engine airplane or a twin without counter-rotating propellers, most pilots agree it takes more elevator to keep the nose up in a left steep turn than in one to the right.
If you're flying a light twin with counter-rotating propellers, the control requirement will be the same in either direction of bank.