Cierva CR.LTH-1 "Grasshopper"
by last date | by total length | by number


18.09.2021 20:11

16.09.2021 04:09

Kaman K-16

15.09.2021 16:20

13.09.2021 07:04

11.09.2021 13:15

10.09.2021 17:54

Bratukhin B-10

09.09.2021 21:51

08.09.2021 00:35

07.09.2021 19:18

07.09.2021 06:03

Kaman SH-2 "Sea Sprite"

04.09.2021 16:07

04.09.2021 05:29

Mil Mi-17

03.09.2021 08:30

Watkinson CG-4

31.08.2021 13:36

Cicare CH-3 "Colibri" (CK1)

30.08.2021 05:36

28.08.2021 23:01

Rotorway Javelin

28.08.2021 22:14

27.08.2021 13:44

Zeus Helicopter "Zeus"

25.08.2021 16:57

20.08.2021 12:09

Sikorsky S-53 / XHJS

17.08.2021 13:51

14.08.2021 13:51

Kamov-Kumertau "Rotorfly"

14.08.2021 03:17

11.08.2021 20:44

07.08.2021 15:55

30.07.2021 23:30

30.07.2021 17:32

29.07.2021 01:50

Bell Model 204 "Iroquois"

27.07.2021 12:55

26.07.2021 23:57

Yakovlev Yak-24

Martin Forster, e-mail, 18.10.2020 03:44

Hello Mike, I would be very interested in reading copies of your fathers flight reports, Would this be possible?

Martin Forster, e-mail, 18.10.2020 03:42

Hello Steve, I saw your comments on the Cierva Grasshopper project on the website and would be very interested in hearing about your recollections of the project. Regards, Martin Forster

Steven Basic, e-mail, 31.07.2016 04:25

Please forward to me the e-mail address of Mr. Ron Segall, Aerodynamicist. My support of this project lasted from 1967 to 1979, I worked at the Finchley Road and Red Hill Aerodrome and promoted to the manager of the department for analysis of aerospace structures of the Cierva Helicopters. I used to work with Bill Heyward and other employees.
Now I am retiree of the Boeing Corporation and trying to start: PRO-ENERGY-CIERVA.
Please be free to hand over my e-mail address to Mr. Ron Segall and Miss. Vicki Heyward.
Best regards
Steven Basic

Vicki, e-mail, 24.02.2016 04:16

My father, William George (Bill) Hayward, worked on this project, I think as an engineering designer. I remember visiting his office in Finchley rd and the air field in Redhill during the late 60's. I was told he worked with Mr Shapiro.
I would be very interested to find out more about his role with the company.
Thank you

Peter Welsford, e-mail, 28.04.2014 14:51

28.04.2014 Very interesting indeed. I and several investors one a helicopter ex Fleet Air Arm pilot, were about to back Shapiro (and the Hon Roo Weir of The Weir Group a pilot was involved) but, he had a heart attack and died, the very day we were due to sign a licencing agreement with him! Apparently, it was not meant to happen!!

Later on we bought the rights and the stock of parts and the protoypes of the CXR Twin Rotorcraft based in Redhill, off the Liguidator and engaged Chris Fischer a helicopter designer with Messerchmit in Germany, to update the design using latest electronic technology, to obviate the blade tip clearance problem which had beset the earlier developments, and to update the engine. BP Chemicals Bristol were keen to make the empennage and so, willing to assist financially. We mounted a presentation in The Aero Society, Park Lane where Fischer and others gave a power point presentation, attended by Westland and other manufacturers and suppliers but, the general consensus was that they were too busy with military designs and their many production problems in Yeovil associated with them, to be interested in getting actively involved with our latest, CXR in the smaller, commercial market place. Hence the 2 prototypes finished up in a helicopter museum in Wales and the project had to be very sadly, abandoned. Pity because we and Fischer believed we had reduced the blade tip problem dramatically and Westland confirmed it was a perfectly viable idea. Can well recall Shapiro in his London Mews flat,talking about Ken Reed the test pilot and his very valuable (and dangerous) work!

Prof Reg Austin, e-mail, 19.08.2013 14:11

Re the question of co-axial rotors, the ML Aviation Sprite unmanned helicopter had co-ax rotors and was very successful, flying in several countries of the world by day and by night, off land and off ships.
It demonstrated, to many people's amazement, how impervious it was to wind conditions which grounded other aircraft.
It also showed the better performance of the co-axial rotor system compared with other configurations.

Dr Peter Holmes, e-mail, 07.06.2013 03:26

I too worked on this project at Finchley Road and Redhill aerodrome. I was looking after the instrumentation, and evaluating the data, as well as approving flight plans. I took this over after Dick Parker left the firm. He had previously been chief development engineer and left to start his own company. I was involved with testing with the two rotors running on a bare airframe. The basic problem with the aircraft at that time lay in the closeness of the blades which, being very flexible, could deflect enough to hit each other and the mechanism between the two swash plates at that time, was unable to prevent this. I was acting as flight engineer on two occasions when the blades came into contact with each other. The second of these was a pretty dramatic event!
Following a later incident on a tethered test, I grounded one of the rotors but I was over-ruled and it was put onto an aircraft. That's when I left., 23.12.2011 09:46

Is there anybody working on a technology update and production? I know investors who are interesting in an investments in co-axial helicopter. Thanks. Joni

Neil Corbett, e-mail, 07.12.2011 02:31

Dear Michael,I have featured your late father on my test pilot tribute website, however, i would like to add more information and also pictures of him 'in cockpit' or with the helicopters he tested. If you can help in any way, i would be most greatful.
Hope to hear from you,
All the best from Scotland

Mike Reed, e-mail, 08.09.2011 16:48

My late father was KEN REED,the TEST PILOT on the Grasshopper.I have various photos plus all his reports on flights.

john k.cartwright, e-mail, 28.07.2011 02:44

i john k. cartwright,was the prelemanary design engineer on this helicopter in 1965.

Don Hillberg, e-mail, 23.06.2010 03:39

The Sikorsky X2 is a Ridgid system No drag henges,No flap henges only feathering.Doesn't need flyby wire,I like the Grasshopper,looks nice,all but one Coaxle rotor A/C have a problem in autorotation,control reversal in yaw,the QH 50 solved this little thing,just a note:

Ron Segall, e-mail, 07.05.2009 23:14

I also worked on the CR Twin with Dr Opatowski and would love to contact him, but an e-mail to his address comes back as unrecognised.

Do you have any further contact details?

Dr. T Opatowski, e-mail, 27.03.2008 15:27

In reply to Pierre Terrail: I left the project soon after the stage shown in the photograph when Mr. Shapiro wanted me to join his office (Servotec) in an unsatisfactory position rather than work as a consultant from my own firm of Technical Investigations Ltd. I should also point out that the MK 2 version had its engines in the rear rather than the previous front location. As far as the rotor system is concerned it was very close coupled and the rotors were (theoretically) held apart by a rigid conta-rotating structure patented by Mr. Shapiro. If thay are far apart, as per the Russians, it is not very efficient. My analysis of the system concluded that it would not work safely unless there was a very sophisticated higher harmonic blade pitch control system though something could be done with an appropriate delta 3 hinge. I think that the Sikorsky high speed helicopter under development, which has close coupled contra-rotating rotors, has individual blade pitch control.

Pierre Terrail, e-mail, 16.10.2007 15:10

Dear Dr. Opatowski, may we have an evaluation of this coax helo: vibrations? performances? why there is no follow up? Why this is not a success? Why aren't we seeing more coax in the sky???

Dr. T. Opatowski, e-mail, 26.07.2007 14:54

I carried out some of the early development work on this aircraft at Redhill (on a consultancy basis) and have a photograph of the engineer Mr. Tony Higgins and myself running the bare platform with blades on one of the two co-axial rotors only.

All the World's Rotorcraft

Virtual Aircraft Museum

Sights of Estonia