Jet nozzle at the tip of some helicopter rotor blades
The Hiller Hornet was one of the first tip-jet–powered aircraft.Tip jet of a SNCASO Djinn
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. Some simple monocopters are composed of nothing but a single blade with a tip rocket.[1][2]
Tip jets can use compressed air, provided by a separate engine, to create jet thrust. Other types use a system that functions similarly to the afterburner (reheat) on a conventional jet engine, except that instead of reheating a gas jet, they serve as the primary heater, creating greater thrust than the flow of pre-compressed air alone; the best description of this is thrust augmentation. Other designs includes ramjets or even a complete turbojet engine. Some, known as rocket-on-rotor systems, involve placing rockets on the tips of the rotor blades that are fueled from a tank.[3]
If the helicopter's engine fails, the tip jets on the rotor increase the moment of inertia, hence permitting it to store energy, which makes performing a successful autorotation landing somewhat easier. However, the tip jet also typically generates significant extra air drag, which demands a higher sink rate and means that a very sudden transition to the landing flare must occur for survival, with little room for error.
^Peklicz, Joseph. "Build the Monocopter." Sport Rocketry, 44, 2 March–April 2001. p. 34.
^Hodge, Jon. "Monocopter C6 MII Review." Cosrocketeer, 12, 4, July–August 2000. p. 4-5.
A tipjet is a jet nozzle at the tip of some helicopter rotor blades, used to spin the rotor, much like a Catherine wheel firework. Tipjets replace the...
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sufficient to make the idea unworkable. The Gluhareff Pressure Jet (or tipjet) is a type of jet engine that, like a valveless pulsejet, has no moving parts...
passages channel air to the blade tips such that air escapes in a fine jet tangentially. The air jets on the blade tips causes the entire toy to spin, the...
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