Sometimes it is enclosed in the form of a ducted fan.

A model turbine and ducted fan were also on display.

Its long nose and high speed makes you wonder if you're not actually flying a ducted fan model.

The ducted fan unit and motor are also available separately.

It has also been described as a ducted fan.

Despite its name it does not use a jet pack as such, but ducted fans for lift.

The hot breeze from their ducted fans buffeted the crowd.

Andy is using a ducted fan in this aircraft of which two pictures can be seen below.

It uses a gasoline engine with two ducted fans to provide lift.

Some designs may use a ducted fan design to increase upward thrust.

They came up with an engine design which they called a "ducted fan".

Due to the ducted fan, the aircraft is exceptionally quiet.

All three ducted fans are equipped with two blade rotors.

This sharply tilted the front of the sub up and the ducted fan pulled them down.

Just pick the one that suits you best, available for 2-stroke, 4-stroke, ducted fan and heli.

Propulsion is provided by a ducted fan with inlet under the chin.

The use of thrust vectoring using ducted fans or propellers.

There are a total of four engines, all of which are ducted fans.

Ducted fans usually have an odd number of blades to prevent resonance in the duct.

Some electric-powered ducted fan airplanes can reach speeds of more than 320kmh (200mph).

Ducted fans offer enhanced safety on the ground.

The first is to use a ducted fan rather than an un-ducted fan.

So the flyer was no more than a platform with controls slung between two ducted fans.

One of the design elements it embodied, the use of ducted fans, led to other experimental programs.

The ducted fan design allows the car to achieve the speed and maneuverability of a helicopter.