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Problem statement:
google for "helicopter crash tail rotor" and you will know.
Solution:
Add a jet just behind the cockpit as a substitute for the tail rotor. When the tail rotor fails, the tail jet should fires automatically. If it does not, the pilot must be able to fire it up manually too.
This
jet , due to fuel capacity limitations may burn for around 5 to 10 minutes only - just enough to take precautionary measures, finding a safe landing spot and landing.(This is not based on any data, this is my really wild guess. can anybody give me a more accurate estimate/solution?).
No Tail Rotor
http://www.mdhelico...TAR/About_Notar.htm
[AbsintheWithoutLeave, Oct 29 2005]
Werewolf helicopter gunship
http://www.centenni...y/Soviet/HE19G7.htm
Used counter-rotating rotor design. [Adze, Nov 03 2005]
[link]
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Auto-rotation is how they bring down a helicopter when the tail rotor fails. If the main rotor fails your screwed anyway. |
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Some helicopetes use engine exhaust to serve the function of a tail rotor. |
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The Hughes (or McDonnell-Douglas) NOTAR are tail-rotorless craft that use vectored exhaust for anti-torque. |
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Auto-rotation produces no torque so, during auto-rotation as long as some forward motion is maintained, no anti-torque is needed to maintain flight during an emergency descent. You do lose yaw control at the flare, though, so an idea for emergency secondary yaw control isn't such a bad idea. Having a large amount of lateral thrust so close to the center of rotation, "just behind the cockpit" isn't a great idea unless the whole tail boom is gone, too. |
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Jet: long-lasting, slow to run up, expensive, complex, heavy. |
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Rocket: short-burning, quick igniting, cheap, simple, light. |
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Otherwise, not such a bad idea. |
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Rockets aren't throttleable or really very controllable. |
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Liquid fuel rockets are ok, but then they are more complex and heavier than solid fuel. |
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With jet I did not mean the exact Jet engine. All I meant was some thing which will give a pressurised flow of steam/burning fuel ... beer? ;-) |
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Also, the thing can be right behind the Cockpit compared to the rotor. |
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Though there are rear - rotorless helicopters, what can we do about the thousands of helicopters that are already existing? |
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Simply fitting them with a jet/rocket will be a nice idea. |
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I just got another idea.. How about blowing off the main blades and deploying parachutes? |
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I do believe that there are helicopters that use exploding bolts to blow off the rotors. |
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I do not see a need for this idea. Because you can land a helicoptor that has lost its tail rotor, because of auto rotation. |
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If gas turbine fails and you lose power, your screwed anyway. |
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How long does it take for a jet engine to fire up? Isnt it a relatively slow process? Can it fire up in time to counteract the loss of the rear rotor? |
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It need not be exactly a jet.. as I said above, it could be anything that can let a controlled steam/pressurized gas that can couteract the force. |
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