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How do tip jets work?

How do tip jets work?

A tip jet is a jet nozzle at the tip of some helicopter rotor blades, used to spin the rotor, much like a Catherine wheel firework. Tip jets replace the normal shaft drive and have the advantage of placing no torque on the airframe, thus not requiring the presence of a tail rotor.

Why don t helicopters use piston engines?

Turbine engines have replaced piston engines for helicopters for many of the same reasons as they did in aviation: they have better power-to-weight, better performance, and are generally simpler devices.

How do jet helicopters work?

Helicopter Jet Engine Type A helicopter runs a type of jet engine known as a Turboshaft Gas Turbine engine. A jet engine you see on the wing of a plane pulls air in the front, compresses it, mixes it with fuel, ignites it and fires it out of the back. Helicopters need a different kind of propulsion.

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Are helicopters Jets?

A helicopter runs a type of jet engine known as a Turboshaft Gas Turbine engine. A jet engine you see on the wing of a plane pulls air in the front, compresses it, mixes it with fuel, ignites it and fires it out of the back. Helicopters need a different kind of propulsion.

What is the HJ-1 ramjet tipped rotor?

The HJ-1 ramjet tipped rotor propels the rotor and the aircraft. Unlike a conventional helicopter, this mechanically simple design avoids the need for a tail rotor. Unfortunately, the tip speeds on helicopter rotor blades are subsonic, and ramjets are inefficient at subsonic speeds due to low compression ratio of the inlets.

What was the first jet-powered helicopter?

Design and development Hiller Hornet with litter attached in flight, 1951 The Hiller HJ-1 Hornet was an early attempt to build a jet-powered helicopter using ramjets. Before that there had been experiments with the XH-26 Jet Jeep tip rotor pulse jets.

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What happens if a prop blade falls out of a helicopter?

If the helicopter’s engine cuts out or throws a prop blade, you can’t just glide down to the ground the same way as a fixed wing. So, any changes you make to a basic, proven design would be subject to extreme skepticism and testing by both aviation regulators and owners, to say nothing of starting from scratch.

How to reduce the noise of stealth helicopters?

It seems though, that the techniques for sound mitigation of helicopters have been known since at least the 1970s ( The Quiet One) let alone the stealth helicopters used in the Bin Laden raid. That is, part of the solution appears to be to use more rotor blades while decreasing the speed of the rotors.