It includes several design features that are likely to carry through to future demonstration prototypes, showcasing counter-rotating propellers
and lightweight electric motors.
Guo, "Experimental study of counter-rotating propellers
for high-altitude airships," Journal of Propulsion and Power, vol.
11, is a flying-wing tailsitter design with a four-point landing wheel configuration, powered by twin, counter-rotating propellers
on its nose.
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
. These vehicles are limited, however, by their battery power, which allows missions that last only a few weeks.
VMC, CRITICAL ENGINES AND COUNTER-ROTATING PROPELLERS
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.