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555


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Cierva
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The first experimental Cierva W.9



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Yippie Kai Yay, Mr. Falcon.



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Hi,

here is Cierva W.7 and may be W.8;



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hesham


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hesham wrote:

Hi,


here is Cierva W.7 and may be W.8;



Thanks, but there is a mistake. The first aircraft is captioned as a Weir project, not Cierva.



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555


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Further reading of the PDF file identifies the first one as the Weir Type W.7 Gyrodyne, while the Cierva one is simply titled "Cierva Gyrodyne".




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Cierva W.11 Air Horse, found at SPF.

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Hi,

for Cierva projects;

C.14 was a flying boat Autogyro for the 31/26

Spec.,and the Shorts Brother who was developed it.
C.31 was a project of 1934 for a two-seat coupe autogyro with
retractable landing gear and powered by one 385hp Napier Rapier
IV engine.
C.32 was similar to C.31 but powered by one 200 hp De Havilland
DH Gipsy Six engine.
C.33 (Avro-665) was an Avro project ,envisaged the combination
of a four-seat Commodore biplane with a three-blade rotor,powered
by one 240 hp Armstrong Siddeley Lynx IVC engine.
C.37 was a twin-engined cabin autogyro,prposed by Avro as the
Type-668.
C.39 was a project for 2/3 seat fleet spotter autogyro to Spec.
22/38,this would have had a three-blade rotor and 600 hp Rolls-
Royce kestrel engine.


And an amphibian autogiro.



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hesham


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I personally wouldn't call the Air Horse "little-known", although it remained a prototype. It is well documented and illustrated. Depending on generations and areas of interest, what is unknown to some may be very well known to others...

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Stéphane



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Thanks for giving Cierva a topic of its own! Without this company there would scarcely have been any autogyro at all!!!

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Stéphane



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I never saw these before so i guess they are little known... to me ,lol.

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Stargazer2006 wrote:

... I really do wonder if it wouldn't be best to have a "unbuilt projects" topic on one side and a "little-known rotorcraft" on the other. There is just too much stuff of different nature in this thread.



I have wondered the same thing myself, if they should be separate. I personally don't like to split categories up too much, it just makes certain aircraft harder to look up on the forum. Besides, I can't do any splitting or merging yet until ActiveBoard reads the user suggestions and adds that feature.



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The Cierva C.33.



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hesham


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Avro 668
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Hi,

here is the Avro-668 twin engined cabin twin boom Autogiro project.



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hesham


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By the way,

the Avro-668 was also called Cierva C.37.

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hesham


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Cierva
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The Cierva C.30A was also known as the Avro Type 671 Rota I and Rota II.



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Stéphane



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Parnall Gyroplane (Cierva C.10 and C.11)
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In 1928 the Cierva Autogyro Company contracted Parnall to design and build two machines to be designated C.10 and C.11 in the Cierva series, the C.11 being later called the Parnall Gyroplane. The airframes were designed by Harold Bolas. The C.10 was powered by an Armstrong Siddeley Genet while the C.11 used a 120 hp Airdisco. The C.10 turned over on take-off at the airfield in Yate and was taken to Hamble for repair at which time it was modified to incorporate an engine-driven rotor-starting device.



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Stéphane



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Cierva
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Air Horse query

One for the experts.

Is this really the Cierva W.10 as stated in these two articles. The first from The Aeroplane Spotter, 13th July 1946 and the second from Flight September 11th 1947?

Or is this information from the appendices of British Military Helicopters. John Everett-Heath, Arms & Armour Press 1986, nearer the truth.

"1946 Weir W.10,  510 h.p Armstrong-Siddeley Cheetah, Take off weight 2,222lbs, Rotor diameter 14.0m, 6 seats. Similar layout to W.9"





-- Edited by Ross on Tuesday 4th of October 2011 06:37:29 PM

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I think that might be a mistake. From what I've read, W.10 was a designation assigned to a 4- to 5-seat single-engine helicopter project.

I'm still looking in to it.



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C.10 was a 4-blade autogyro that crashed in 1927.



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Vince are you referring to the W.10 being discussed? If you are then I have to say you got the wrong aircraft. You're right about the C.10, but then a similar design with more powerful engine was developed shorly after called the C.11. The aircraft after the W.10 was the W.11 Air Horse, a large aircraft with 3 main rotors. My point is that you're mixing the W designations with the C designations, which were really different aircraft!1



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Says the guy who'se never seen these before? smile



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That was almost a  whole year ago, so of course I learned more about them through that period of time. Not enough to make a designation list like Stephane, but enough to make some helpful corrections.



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Sorry I was joking. I saw the date you posted that. 

What I meant to say was Thank you for correcting me. And do you know about the W.10 then?



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No prob!biggrin

Nope, the W.10 is a new one. Everytime I search for it I keep getting the C.10 instead.



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It was as Stingray said a single-engined five-seater project, and it was definately a helicopter, not the usual autogyro. Apparently Cunliffe-Owen Aircraft built a prototype before Weir ceased investment in the Cierva company in 1948 due to the W.11 crash.

What happened with the design after that I'm not sure. Maybe it was known under a Saunders-Roe heading by then?



-- Edited by Pepper on Wednesday 5th of October 2011 01:21:49 AM

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W.10 was abandoned in favor of developing the W.11.

Anthony, the first helicopter by Saunders-Roe was designated W.14 and it was AFAIK the one and only design post-Cierva/Weir with a W. After that they used P as their prefix, so it wouldn't make any sense at all that a "P.10" exist under their name.



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Thanks for all of your input. Mystery solved.

And here is the real aircraft depicted in Ross' articles:

The "Spraying Mantis" (projected modification to W.11) designed by Pest Control Ltd. and the Cierva Autogiro Co., Ltd., and claimed to be exclusively for agricultural work.



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Thanks to everyone for their comments,

I agree that the aircraft shown is the "Spraying Mantis". A mock-up built by Cunliffe-Owen for Cierva. It was never built as the real thing, during wind tunnel tests it was found that it was far better to have the single rotor at the front rather than the rear. The design was changed and Cierva also decided to capitalise on the potential load carrying capabilities for both military and civil applications  by having an enclosed fuselage fitted, thus the W-11 Air Horse as we know it emerged. Pest-Control Ltd lost interest in the project when they found that crop spraying could be performed easier and more cheaply by smaller helicopters.

On a separate note the Cierva designation W.14 applied to the first two Skeeters built the Mks 1 & 2. When Saro took over responsibility for the design it became their P.501.



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Thanks Ross for explaining the connection between the AIR HORSE and SPRAYING MANTIS, which was never too clear until now. I knew the Mantis came first, but didn't know how and why it had evolved.



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Stéphane



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Hi,

for Cierva W.12 project;

http://www.secretprojects.co.uk/forum/index.php/topic,4283.msg33837.html#msg33837



-- Edited by hesham on Friday 7th of October 2011 09:45:33 PM

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hesham


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Cierva R1.

http://wesworld.jk-clan.de/thread.php?threadid=1704&sid=2981484ea0d9e4e776930f57977ec2e0



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