height limited sport helicopter
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Location: Port Townsend,WA. USA
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Mart,
Yes, a low helo is similar to a hovercraft, but a hovercraft has no cyclic for control in situations like hovering on a slope. Most hovercraft can't pass over a ten foot ditch either.
I have a book you might like Mart, the author worked on the Lockheed Cheyenne. The book is: Radio Control Model Helicopter Handbook by Don Lodge. Out of print but available at amazon.com for under $4. The book has some info that applies to full scale helos, especially the Lockheed gyro.
Mac,
Wires are sometimes pretty high. Its a problem. That is why low should go with very slow.
Check this out for low and slow. http://www.personalblimp.com
Yes, a low helo is similar to a hovercraft, but a hovercraft has no cyclic for control in situations like hovering on a slope. Most hovercraft can't pass over a ten foot ditch either.
I have a book you might like Mart, the author worked on the Lockheed Cheyenne. The book is: Radio Control Model Helicopter Handbook by Don Lodge. Out of print but available at amazon.com for under $4. The book has some info that applies to full scale helos, especially the Lockheed gyro.
Mac,
Wires are sometimes pretty high. Its a problem. That is why low should go with very slow.
Check this out for low and slow. http://www.personalblimp.com
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Mart,
I suspect that the short tail-boom on intermeshing helicopters, and on Benson style gyrocopters, may have been an overreaction to the elimination of the tail-rotor. The newer K-max and fixed-wing craft have long tail-booms.
Low and slow.
Dave
I'm always amazed how compact intermeshers look without that tail rotor.
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Low and slow.
Dave
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height limited sports helicopter
The CAA permit to fly for HLSH could maybe read
1 The pilot may only fly over private property with the consent of
the owner or landlord
2 The machine must be fitted with a ground proximity device
3 The helicopter must be capable of executing a full down autorotation
from its permitted operating height either from stationary hover or at
its maximum permitted speed
4 The pilot will be responsible for his own safety, and will not hold the
CAA liable for any injuries howsoever caused
Graviman thanks for your kind offer i will pm you
bug
1 The pilot may only fly over private property with the consent of
the owner or landlord
2 The machine must be fitted with a ground proximity device
3 The helicopter must be capable of executing a full down autorotation
from its permitted operating height either from stationary hover or at
its maximum permitted speed
4 The pilot will be responsible for his own safety, and will not hold the
CAA liable for any injuries howsoever caused
Graviman thanks for your kind offer i will pm you
bug
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Regulation
Bugdevheli,
You might not need a permit.
Wing in ground effect vehicles have three regulation classes:
class A) unable to fly above ground effect
class B) able to jump above ground effect briefly.
class C) able to fly above ground effect continuous.
Class A and B are not considered aircraft by most aviation authority.
You might not need a permit.
Wing in ground effect vehicles have three regulation classes:
class A) unable to fly above ground effect
class B) able to jump above ground effect briefly.
class C) able to fly above ground effect continuous.
Class A and B are not considered aircraft by most aviation authority.
-- IFMU
rocket powered helicopter
There was a thread, posted perhaps on rotorheads, about a rocket powered propeller. Some creative nutjob had carved a pine propeller, drilled a hole from the root to the tip for rocket power, and had the rocket spin the prop. It may have been a peroxide rocket. Tremendous power to weight, but they kept catching on fire. He ground ran a couple of them. This guy goes on to speculate the uses for this propeller, and he had a link to a small weight-shift powered helicopter, using a 2-stroke engine, counter rotating fixed pitch props (I think). The helicopter was of German origin. It seemed to have enough power to get light, but the 'pilot' got it airbone for seconds at a time with mighty hops (his legs are the landing gear. They retracted, but appeared to have little speed benefit). Here's your ground effect helicopter. Anybody save the links, or know what I'm talking about?
-- IFMU
-- IFMU
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Bug, Standing by. All unclosed thread refs deleted.
BTW you might like to see if you can find Commanche hub details for your rotor ring idea. Nick commented on this forum that it used elastomeric bushes to retain the blades to the spars in a "bearingless" design. I gather that the spars were clamped between two plates, which might give some ideas for your construction. I have been unable to find more detailed info, but the AHS search is a start:
AHS search on "Comanche"
----
Slowrotor, you got me! I am indeed a great fan of the AH-64, and also the X2 since it promises to reintroduce many concepts that fell by the wayside after Lockheed stopped that project. Technology like that belongs in the public sector where it will be of most benefit. I'll look the book up, thanks.
Agreed about cyclic control and improved versatility. I would be interested how the machine layout looks, since this will decide it's success. Most of the "air-jeep" concepts are based on 4 teetering rotors. The ground transport machines we design are more versatile than most, so probably prove the limitations of wheeled transport. Still i'd rather have been a helicopter design/analysis/test engineer.
Mart
BTW you might like to see if you can find Commanche hub details for your rotor ring idea. Nick commented on this forum that it used elastomeric bushes to retain the blades to the spars in a "bearingless" design. I gather that the spars were clamped between two plates, which might give some ideas for your construction. I have been unable to find more detailed info, but the AHS search is a start:
AHS search on "Comanche"
----
Slowrotor, you got me! I am indeed a great fan of the AH-64, and also the X2 since it promises to reintroduce many concepts that fell by the wayside after Lockheed stopped that project. Technology like that belongs in the public sector where it will be of most benefit. I'll look the book up, thanks.
Agreed about cyclic control and improved versatility. I would be interested how the machine layout looks, since this will decide it's success. Most of the "air-jeep" concepts are based on 4 teetering rotors. The ground transport machines we design are more versatile than most, so probably prove the limitations of wheeled transport. Still i'd rather have been a helicopter design/analysis/test engineer.
Mart
Last edited by Graviman; 21st Dec 2006 at 03:27.
