The main propulsion comes from a pair of ducted propeller thrusters with one mounted on each side.

Ducted propellers are sometimes used for steering.

The type was already familiar to Mississippi State University, as it had used one to test ducted propellers.

This is essentially a ducted propeller attached to a jet engine, much like a turboprop, but with a smaller diameter.

A ducted propeller is mounted as an integral part of the rudder and is fixed to it.

The 'Kort nozzle' is a shrouded, ducted propeller assembly for marine propulsion.

Other improvements included utilization of ducted propeller, and redesigned skirt and propulsion system.

Bell X-22 rotating ducted propellers.

The RF-1's propeller was completely shrouded, creating a hybrid ducted propeller.

Vectoring ducted propellers.

The mechanical arrangement may be a ducted propeller with nozzle, or a centrifugal pump and nozzle.

But Pratt & Whitney is pressing forward with an advanced ducted propeller engine, with the blades encased within a metal ring.

Propulsion is supplied by three main engines with ducted propellers in the stern, while two additional vertical and one lateral impellers ensure the maneurability.

The aircraft's wing and ducted propeller were tested on a piston-engined test bed, the XAZ-1 Marvelette.

A ducted propeller, also known as a Kort nozzle, is a propeller fitted with a non-rotating nozzle.

A research paper by Bexton et al. (2012) concluded that ducted propellers were the likely cause of fatal injuries of seals in the northeastern Atlantic.

Piasecki is planning to use the vectored-thrust ducted propeller design of the X-49 for their entry in the Future Vertical Lift program.

The Aquamaster thrusters also require considerably more maintenance and the ducted propellers suffer from clogging when the icebreaker is operating in brash ice channels.

JEFF A was designed and built by Aerojet General in California, with four rotating ducted propellers.

The resultant design was a shoulder-winged monoplane powered by a single Allison T63 turboprop engine driving a pusher ducted propeller.

Kort nozzles or ducted propellers can be significantly more efficient than unducted propellers at low speeds, producing greater thrust in a smaller package.

The two seat Cessna XMC was built to test several concepts in light aircraft design including a ducted propeller and swept cantilever wing.

Piasecki pioneered tandem rotor helicopter designs and created the compound helicopter concept of vectored thrust using a ducted propeller.

Called an advanced ducted propeller, such an engine could cut fuel consumption by 15 to 20 percent, Pratt engineers think, and eliminate the need for a thrust reverser to slow the airplane on landing.

A small sub built largely of composites would not be too heavy to double as an ACV in calm weather, switching from ducted propellers to ducted fans for this high-speed cruise mode.