Bevan small ramjet helicopter from 1948


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12 July 2006
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Just reading Matthew Uttley's "Westland and the British Helicopter Industry 1945-1960" I stumbled across the Bevan small ramjet helicopter project for Specification E.1/48, initiated in 1948 and cancelled in 1953. Checking all my sources (incl. the WWW) I even cannot find a company with this name (no entry in Gunston's Encyclopedia of Aircraft Manufacturers).

The Forum is my last hope ...


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this Patent was probably from late of 1940s,is it related to De Havilland TK.10/TS.10 ?.,24688.0.html


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I've dug out the relevant file at Kew (AVIA 54-768) and while it provides a few answers it does at least give the background to this project.

As Apophenia highlights here (,26602.msg272306.html#msg272306), Bevan Bros. built an Isacco rotating-wing parachute in 1947 and a couple of technicians there began working on small ramjets.

Capt. R.N. Liptrot who crops up in many a British aircraft project history, by 1947 had been appointed as DDRD. Helicopters.
He had harboured a desire to build a small helicopter based on the Rotorchute and he suggested the firm should submit a proposal for a ramjet-powered helicopter.
The company would develop the rotor which would be fitted to an Fa-330 or a Rotachute airframe following ground tests. The RAE felt the project was feasible but had doubts an inexperienced firm would be able to make early success and advised a step-by-step development programme.
Spec E.1/48 was issued in December 1947 to cover this work and contract 6/Acft/2079/CB.9(a) was awarded to Bevan Bros. Aeronautical Engineers Ltd., Rettendon Common, Chelmsford, Essex to develop the rotor. Liptrot felt the development would only cost £8,000. It was planned to issue a second contract for the actual helicopter.
Liptrot felt a two-blade rotor would work but the RAE felt a single blade or triple-blade would be better to reduce vibration. There were some worries over yaw control in the hover but it was thought a separate control system would not be required.

Steve Coates and Jean-Christophe Carbonel's 'Helicopters of the Third Reich' states two Fa-330 airframes were assigned to Bevan Bros. and serialled VX259 and VX266. Work continued during 1949, it seems at least low-speed tests on the ramjets were undertaken and a wind tunnel was built (completed?) but the project was cancelled on 24 Feb 1950. Another Fa-330 was assigned to Bevan Bros. on 18 April 1951 and was serialled VX850 but there the trail goes cold.

I think we can safely discount the De Havilland TK.10/TS.10 from this Spec. TK-designs were apprentice designs rather than proper projects and Bevan was intended as the sole firm to do the ramjet work.
Great Infos my dear Hood,

but for DH TK.10/TS.10 it was just a Project.

also Bevan had a Project for single seat rotor-chute of 1947 ?.
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