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Rocket Assisted Rotors

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Rocket Assisted Rotors

Old 12th Jul 2021, 01:54
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Rocket Assisted Rotors


Interesting video and concept. Im not sure Id want a couple of hundred litres of hydrogen peroxide spinning above my head. Guess that might be why the idea never took off
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Old 12th Jul 2021, 02:29
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Didn’t the Rotodyne have that?

https://en.m.wikipedia.org/wiki/Fairey_Rotodyne
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Old 12th Jul 2021, 03:55
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Tip Rocket, Tip Jet

The Rotordyne had rotor tip ram jet thrusters fed fuel along the blades. The Hughes H 17 (https://en.wikipedia.org/wiki/Hughes_XH-17) used tip jets that were fed air from engines on the fuselage. I think the Rotordyne was the first machine to fly with ram jet tip thrusters, the second was probably the Dutch single rotor blade helicopter (!) the NHI H-3 Kolibrie (https://en.wikipedia.org/wiki/NHI_H-3_Kolibrie) which was relatively successful and flew in the late 1950s. Seated in that picture in Wikipedia is Rene Van Der Harten, a founder of KLM Nordzee, a personal friend and one heck of a pilot. It takes lots of courage to strap yourself into a one-bladed tip jet helicopter in the 1950's!

All these machines had no torque and so no anti-torque devices. I would suppose they would fly quite similarly. They were all reportedly able to extremely efficiently turn fuel into noise.
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Old 12th Jul 2021, 04:23
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The interesting bit I found was that the rockets were only to supplement a regular engine for high power ops or to extend auto range. The idea must be redundant with turbine engines with high power to weight but still its an interesting concept. Im not sure hydrogen peroxide would be the safest in an accident or under fire.


Doesnt the Rotordyne use the jet thrusters as the primary thrust?

Your friend certainly must have been very brave to fly a one bladed helicopter Nick, and with a new propulsion system!
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Old 12th Jul 2021, 12:53
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People who were around at the time told a story that a leak developed when no one was around which consumed most of the aircraft except for the resulting rusty steel. Don't know if it is true but a lot of things were tried back then that would make you shiver.
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Old 12th Jul 2021, 14:35
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Originally Posted by NickLappos View Post
The Rotordyne had rotor tip ram jet thrusters fed fuel along the blades. The Hughes H 17 (https://en.wikipedia.org/wiki/Hughes_XH-17) used tip jets that were fed air from engines on the fuselage. I think the Rotordyne was the first machine to fly with ram jet tip thrusters, the second was probably the Dutch single rotor blade helicopter (!) the NHI H-3 Kolibrie (https://en.wikipedia.org/wiki/NHI_H-3_Kolibrie) which was relatively successful and flew in the late 1950s. Seated in that picture in Wikipedia is Rene Van Der Harten, a founder of KLM Nordzee, a personal friend and one heck of a pilot. It takes lots of courage to strap yourself into a one-bladed tip jet helicopter in the 1950's!

All these machines had no torque and so no anti-torque devices. I would suppose they would fly quite similarly. They were all reportedly able to extremely efficiently turn fuel into noise.
I'm guessing the most successful tip thrust driven aircraft was the Djinn - 178 built: https://en.wikipedia.org/wiki/SNCASO_SO.1221_Djinn

There used to be one by the main gate at the Eurocopter factory in Marignane
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Old 12th Jul 2021, 15:41
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Being pedantic I know, but it was, of course, the Fairey RotOdyne, not the RotoRdyne....

Even by today's standards it had a really good gross weight to basic weight ratio.
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Old 12th Jul 2021, 19:23
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Lightbulb Thrust Drive System

Here is something more contemporary: Thrust Drive System Announcing Game Changing Helicopter Drive System

Picture

The system uses a unique and powerful propulsion technique to deliver thrust through specialized aerodynamic tubes and nozzles to provide the propulsion to power the rotor blades.

Benefits of this new technology include:
  • ELIMINATES TRANSMISSION, TAIL ROTOR, GEAR BOXES, DRIVE SHAFTS & TAIL ROTOR STRUCTURE ALONG WITH RELATED WEIGHT, COST, AND CRITICAL POINTS OF FAILURE
  • VASTLY QUIETER AND MORE EFFICIENT THAN PRIOR REACTION DRIVE HELICOPTERS
  • ADDITIONAL TIME TO LOWER COLLECTIVE PITCH DURING AUTOROTATION DUE TO THE HIGH INERTIA OF THRUST DRIVE SYSTEM
  • GREATLY ENHANCED AUTOROTATION CAPABILITY DUE TO SEPARATE DECOUPLING OF ROTORS
  • ELIMINATION OF TAIL ROTOR DANGER, BOOM STRIKE/TAIL STRIKE
  • REDUCTION OR ELIMINATION OF VORTEX RING STATE
  • COROTATING AIRFOILS QUIETER THAN CONVENTIONAL HELICOPTER
  • ABSOLUTE VERTICAL TAKEOFF AND LANDING
  • DECREASED ENGINE CABIN NOISE, VIBRATION & HEAT

Last edited by Hot and Hi; 12th Jul 2021 at 19:33.
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Old 13th Jul 2021, 02:24
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Originally Posted by SLFMS View Post
https://youtu.be/zNfAD-LBjEk

Interesting video and concept. Im not sure Id want a couple of hundred litres of hydrogen peroxide spinning above my head. Guess that might be why the idea never took off
JATO for rotary wing!
Fascinating...
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Old 13th Jul 2021, 02:43
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Originally Posted by tartare View Post
JATO for rotary wing!
Fascinating...
That is a good way to look at it. Makes one wonder if that is where they got the idea.
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Old 13th Jul 2021, 08:27
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Originally Posted by SLFMS View Post
That is a good way to look at it. Makes one wonder if that is where they got the idea.
Possibly from Heros aeolipile?
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Old 13th Jul 2021, 11:56
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See also (Hunting) Percival P.74
https://en.wikipedia.org/wiki/Percival_P.74
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