To answer this question, we need to understand how the common shaft driven helicopter works.

The conventional shaft driven helicopter uses an engine to turn its rotor, with a drive shaft through a transmission (much like the way a car’s wheels turn on their axels). This mechanical link between the engine and the rotor creates a force known as torque, which tends to rotate the fuselage (or body of the helicopter) in the opposite direction of the rotor. A tail rotor is commonly used to counteract this torque in order to maintain stability and directional control.

So how is a reaction jet helicopter different?

The rotor is turned from the blade tips rather than from a central drive shaft, the unwanted effect of torque is eliminated. As a result a tail rotor is no longer needed. Directional control is maintained by simply deflecting the engine exhaust stream with a vertically mounted rudder. Other aircraft movement is accomplished with controls identical to those in a conventional shaft driven helicopter.

Our technology simplified

Zummo flight technology is a simple concept, but ingenious by design. As the cornerstones of our business model are simplicity and safety you can see how we eliminate unnecessarily complicated systems.

Hover over the plus signs below to reveal the technology that can be used in helicopters and drones.

Rewriting the rules

The rapid growth of the drone industry has outpaced the development of rules and systems to govern their use. This uncertainty weighs on innovation and commercial adoption, but anticipated regulatory clarity should unlock demand. NASA is leading a multibillion-dollar effort to develop a US airspace management system capable of safely coordinating manned and unmanned flight, while the Federal Aviation Administration (FAA) is expected to further ease restrictions that are keeping commercial drones from reaching their full potential.

Source: Goldman Sachs Research

What makes our concept unique?

Our aim is to:
Reduce the financial cost along with the complexity in helicopter and drone  technology. Minimise known safety issues and to make flight more accessible in general.


We will achieve this through:
Designing helicopters and drones that are as easy to operate as a 5-speed vehicle. We will enhance payload, range and autorotation and in doing so correct the balance of the marketplace.

Currently original equipment manufacturers build unnecessarily complex systems so that they can increase their revenue on maintenance and parts, and we will seek to rectify this position.


This is the most mature market, where drones have long been used to keep pilots out of harm’s way while performing tasks like intelligence gathering or chemical detection.

Source: Goldman Sachs Research

Projected Performance

Zummo Reaction Jet Helicopter vs Conventional Helicopter
MD 500 NOTAR (No tail rotor)

Our Safety advantages

In a Zummo Reaction Jet helicopter, there is no mechanical connection between the engine and the rotor; in the unlikely event of an engine failure the pilots have much greater time to enter autorotation.

“Dead Man’s Curve or height velocity curve”

Which is a combination of low speed and height during the flight, known to pilots to represent high risk in case of engine failure. With Zummo Reaction Jet helicopter technology this means that these risks are eliminated.