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Cierva designations

Stargazer2006

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I still have to finish my detailed Cierva list, but here is a rough version:

SPAIN

BCD-1* 'El Cangrejo' two-seat biplane (* Barcala, Cierva & Diaz)
BCD-2* small racing tractor monoplane (* Barcala, Cierva & Diaz)
C-3 (large biplane)

BRITAIN

C.1 Autogiro N°1
C.2 Autogiro N°2
C.3 Autogiro N°3
C.4 Autogiro N°4
C.5
C.6
C.6A (C.6bis)
C.6B
C.6C (Avro Type 574)
C.6D (Avro Type 575)
C.7 (Loring C.VII)
C.8V (Avro Type 586)
C.8R (Avro Type 587)
C.8L-I (Avro Type 611)
C.8L-II (Avro Type 617)
C.8L-III (Avro Type 617)
C.8W (C.8 Mark IV)
C.9 (Avro Type 576)
C.10 (Parnall 4/26)
C.11 (Parnall 'Gyroplane')
C.12 (Loring C.XII)
C.13 (Short 31/26)
C.14 project of which no detail has survived
C.15 project of which no detail has survived
C.16 project of which no detail has survived
C.17 Mk. I (Avro Type 612)
C.17 Mk. II (Avro Type 620)
C.17 Hydr. (Avro Type 620)
C.18 (Weymann-Lepère CTW.200)
C.19 Mk. I C.19 Mk. II C.19 Mk. IIA C.19 Mk. III C.19 Mk. IVP C.19 Mk. IV C.19 Mk. V
C.20 (Focke-Wulf C.19 'Don Quichote')
C.21 (Lioré et Olivier C.21)
C.22 project, no details (1934)
C.23 design study, no details
C.24 (De Havilland C.24)
C.25 (Comper G.31/1)
C.26 (1) twin-engine autogiro-helicopter design study
C.26 (2) (De Havilland C.24 modified)
C.27 (Cierva-Lepère C.L. 10)
C.28 (Weir W.1)
C.29 (Westland C.29)
C.30
C.30P
C.30A
C.30A (Avro Type 671 'Rota I') (A.39/34?; ordered under Spec. 16/35 and 2/36)
C.30A (Avro Type 671 'Rota II')
C.30A (Avro Type 671 'Rota seaplane')
C.30 (Focke-Wulf C.30 'Heuschrecke')
C.30 (Lioré-et-Olivier LeO C.30)
C.30 (SNCASE C.301)
C.30 (SNCASE C.302)
C.30 Mk. II
C.30 Mk. III
C.30 Mk. IV
C.30 Mk. V
C.30J
C.31 (1) (Cierva-Lepère C.L. 20)
C.31 (2) project for a two-seat coupe autogyro
C.32 design study similar to C.31
C.33 (Avro Type 665)
C.34 (Lioré-et-Olivier > SNCASE C.34)
C.35 design study
C.36 design study
C.37 (Avro Type 668)
C.38 design study
C.39 design study for 2/3 seat fleet spotter autogyro to Spec. S.22/38
C.40 (Bradbury & Cull/British Aircraft Mfg. Co.) (43/36)
C.41 (1) second design study to Spec. S.22/38
C.41 (2) Fairey-Bennett FB.1 Gyrodyne developed to Spec. 4/46


After the war, Cierva takes over the Weir company and continues the W.* series (more on that later).
 

hesham

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Also;


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,proposed 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.
 

Stargazer2006

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hesham, do I need to get cross for you to understand what I say? In a similar topic on another forum, you already posted these and I told you that C.14 was A MISTAKE. I have reliable sources to prove it! And yet you persist, just because you saw it mentioned once in a magazine... If I had made a list of all the mistakes I found in magazines, or even in supposedly reliable books, I'd have pages of them!

So unless you prefer to trust a magazine, the authoritative source should be the book The Cierva Autogiro, which states clearly that C.14 to C.16 correspond to projects of which nothing has survived, while the Shorts hydroaeroplane for Spec. 31/26 is the C.13.
 

AM

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Hi all,

from my archive:

C-5 - f/f 07.1923
C-15 - project only
C-16 - project only
 

Stingray

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Found a new designation today; the W.10.

From what I've read, W.10 was a designation assigned to a 4- to 5-seat single-engine helicopter project, but a member of my forum has found material regarding an early design for the W.11 "Air Horse", in which it is described in one source to be the "W.10". Which is right or wrong? And wouldn't a "W" in the designation mean it was a development of Weir, even in collaboration with Cierva?

http://stingraysrotorforum.activeboard.com/t38340705/cierva/
 

Stargazer2006

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Stingray™ said:
And wouldn't a "W" in the designation mean it was a development of Weir, even in collaboration with Cierva?

No, Travis. Cierva and Weir became only one company and retained just the name Cierva, with "W." designations.
 

robunos

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Sting, see here :-


http://www.secretprojects.co.uk/forum/index.php/topic,3109.msg110311.html#msg110311


for more info on the Air Horse...




cheers,
Robin.
 

Stargazer2006

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The "C." list in the first post is now complete (except for C.14 to C.16, of which nothing has survived).

I will add more details to each entry soon so as to flesh it out a bit.

Here is the "W." list. Designations W.1 to W.5 pertain to autogiros built by G. & J. Weir in Glasgow, and from W.6 onwards, Weir is taken over by Cierva and the projects carry that name.

W.1 Cierva C.28 with custom-manufactured Douglas-Dryad engine (1933)
W.2 Cierva C.28 with Weir O-92 Dryad II flat two-cylinder, horizontally-opposed, air-cooled engine, and drive to spin rotor before take-off (1934)
W.3 single-seater powered by an inverted 4-cylinder in-line engine and fitted with a two-bladed 'auto-dynamic' rotor (1936)
W.4 single-rotor autogiro, a more elegantly finished version of the earlier W.3 design with a 50 hp engine (1937)
W.5 single-seat helicopter powered by an air-cooled engine; two two-bladed rotors each had cyclic and collective pitch control and turned at 430 r.p.m (1938)
W.6 two-seater helicopter built under 28/38 and powered by a more powerful fan-cooled engine located in the nose (1939)
W.7 helicopter project to S.22/38 specification in which the offset airscrew gives propulsion and a very "cushy" clutch effect for starting the rotor
W.8 helicopter project with folding rotor and two propellers in pusher position, one permanently coupled to the transmission and one having a clutch
W.9 experimental helicopter to E.16/43 specification with a three-blade main rotor (1944)
W.10 project for a 4/5-seat single-engine helicopter
W.11 Air Horse, very large helicopter with single Rolls-Royce Merlin 24 engine driving three large three-blade rotors; second example ordered to E.19/46 (1948)
W.11 Spraying Mantis, agricultural spraying version developed with Pest Control, Ltd., project only
W.11T project for an enlarged W.11 with two 1208kW Rolls-Royce Merlin 502 engines (1948)
W.12 projected smaller freighter development of W.11 with Rolls-Royce Dart turboprops and a payload of 1½ tons or 12 passengers
W.13 not assigned
W.14 Skeeter, became the Saro Skeeter, built by Saunders-Roe Ltd. (1948)
 

Stargazer2006

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Here is what the Cierva W-10 was supposed to look like:
 

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Stingray

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Stargazer2006 said:
C.22 (Avro Type 665)
...
C.33 (Avro Type 665)


"Type 665" was used twice for unrelated designs? Or is this a mistake? I'm fairly certain on the accuracy of it applying to the C.33, but due to lack of available info I'm not sure about the C.22. I'm working on the Cierva list at my site (finally) so any clarification on this would be much appreciated.
 

Stargazer2006

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To the best of my knowledge, the Avro designations that were used for Cierva autogiros are as follows:

574 Cierva C.6C Autogiro
575 Cierva C.6D/C.8L* Gyroplane
576 Cierva C.9 Autogiro
586 Cierva C.8V
587 Cierva C.8R
611 Cierva C.8L Mk I
612 Cierva C.17 Mk I
617 Cierva C.8L Mk II
617 Cierva C.8L Mk III
620 Cierva C.17 Mk II
620 Cierva C.17 Hydrogiro
665 Cierva C.33
668 Cierva C.37

The designation "Avro Type 665" for the Cierva C.22 is most probably a mistake on my part.
I also notice I listed some versions of the C.19 as "Avro Type 620" but that is probably a mistake too.

Sorry for the inconvenience.
 

Heligato

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From the Book . . . . .
 

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