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ARCHIVE > Patents
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Jetex Patents 1947 - 1963
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The Jetex motor can boast a rich record of patented invention. It is a tribute to the innovative genius of the Jetex inventors and manufacturers – sustained over a period of 16 years – that they were granted no fewer than 14 patents, by authorities in Britain, France, Germany, Austria and the United States. Inventions covered by these patents included motors, fuel mixtures, ignition mechanisms, pressure relief devices and augmenter tubes. From the beginning, the authors of the patents were concerned to show that each invention had a very practical application, and illustrated their specifications with drawings of model aircraft, boats and cars. The first patent, lodged in 1947, for “reaction motors of the rocket-type”, notes at the outset that “[d]espite the obvious advantages of using such a motor in a model or toy aircraft, vehicle or vessel no practical form of motor small enough for use in such a model or toy has yet been developed.” The creation of just such a motor – effective, efficient, affordable and unquestionably safe – was the inspiration for all Jetex patents. We have transcripts (including drawings) of all Jetex patents published by the London Patent Office, as well as of one published only by the German Patent Office. Click on the number of any patent listed below to view specifications and drawings. |
- UK Patent No 642,689 appl. Nov. 11, 1947 (Fig. 3)
- UK Patent No 642,689 appl. Nov. 11, 1947 (Fig. 1)
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642,689:
Improvements relating to Reaction Motors Suitable for the Jet Propulsion of Model Aircraft or the like Applicants: Wilmot Mansour & Company Limited, Charles Mandeville Wilmot and Joseph Naime Mansour Application date: November 11, 1947 Publication date: September 6, 1950 · Also patented in the United States as Patent No 2,637,162 US application date: July 19, 1948 US publication date: May 5, 1953 This is the mother of all Jetex patents. It specified the classic reloadable reaction micro-motor, using an isometric cutaway diagram of what was to be the Jetex 350 (see Fig. 3 drawing above). As well, it illustrated various applications, with drawings of a model plane (see Fig. 1 above), a boat and a car, each powered by the new motor. 644,073: Improvements in and relating to Solid Gas-Generating Charges Inventor: Alexander Cantlay Hutchison Applicant: Imperial Chemical Industries Limited Application date: October 10, 1947 Publication date: October 4, 1950 This is the complement to the initial patent. Where that simply spoke of “a composition inserted in pellet form into a casing”, this patent specified the actual components of a number of gas-generating fuel mixtures for reaction micro-motors. |
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645,897:
Improvements in or relating to Gas-Escape Reaction Propulsion Devices Applicants: Alexander Cantlay Hutchison, Matthew Wilson and Imperial Chemical Industries Limited Application date: March 3, 1948 Publication date: November 8, 1950 · Also patented in Austria as Patentschrift Nr. 175422 Austrian application date: March 25, 1949 Austrian publication date: 10 July 1953 · Also patented in Germany as Patentschrift Nr. 908353 German application date: July 30, 1953 German publication date: 8 July, 1949 As well as the reloadable motor patented by Wilmot Mansour, ICI also took out patents for a one-shot cardboard reaction micro-motor, in a prefiguring of the similar Rapier motors of 50 years later. 688,838: Improvements relating to Reaction Motors Inventors: Charles Mandeville Wilmot and Joseph Naime Mansour Applicant: Wilmot Mansour & Company Limited Application date: February 24, 1950 Publication date: March 18, 1953 A great concern of Wilmot and Mansour was the safe release of “abnormal pressure” resulting from a clogged orifice. This patent was the first of a number for pressure relief devices, in this case for a springloaded valve and a frangible disc. 712,551: Improvements relating to Model Aircraft Inventor: Joseph Naime Mansour Applicant: Wilmot Mansour & Company Limited Application date: April 15, 1952 Publication date: 28 July 1954 The augmenter tube was the subject of this improvement. Its purpose was to prevent the “considerable loss of thrust” that occurred when a motor was positioned inside the fuselage and discharged “through a tube constituting a continuation of the jet orifice of the motor”. No actual augmentation of thrust was claimed; the invention simply ensured “no loss of thrust”. |
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838,490: Improvements relating to the Ignition of Gas-Generating Charges in Small Reaction Motors Inventor: Joseph Naime Mansour Applicant: Wilmot Mansour & Company Limited Application Date: March 23, 1955 (Gerhard Everwyn believes the actual application date to be September 23, 1954, as noted on the corresponding German patent) Publication date: June 22, 1960 · Also patented in France, as Brevet d'Invention 1.159.960 French application date: August 30, 1956 French publication date: July 4, 1958 · Also patented in Germany as Patentschrift 1 017 421 German application date: February 10, 1955 German publication date: October 10, 1957 Achieving reliable and clean ignition has long been the Holy Grail of Jetex users. The ignition mechanisms specified in this patent promised to deliver just that, but their elaborate intricacy was probably the reason they never made it to production. 907,218: Improvements in or relating to Reaction Motors Inventors: Cecil Arthur Rassier and Joseph Naime Mansour. Applicant: D. Sebel & Company Limited Application Date: August 25, 1958 Publication date: October 3, 1962 · Also patented in France, as Brevet d'Invention 1.233.416 French application date: August 25, 1959 French publication date: October 12, 1960 · Also patented in Germany as Patentschrift 1 113 888 German application date: August 24, 1959 German publication date: 14 September,1961 The stream of inventions continued to flow after Jetex and Joe Mansour passed to Sebel in 1956. Improvements now were relatively minor, however, and this patent was simply for a protective flange, which made it into production on the Jetex 50C, there called an ‘exhaust deflector ring’. 922,560: Improvements in or relating to Rocket Motors Inventors: Cecil Arthur Rassier and Joseph Naime Mansour Applicant: D. Sebel & Company Limited Application Date: August 25, 1958 Publication date: April 3, 1963 · Also patented in France, as Brevet d'Invention 1.233.415 French application date: August 25, 1959 French publication date: October 12, 1960 · Also patented in Germany, as Patentschrift 1 131 129 German application date: August 24, 1959 German publication date: June 7, 1962 The safe release of “abnormal pressure” remained a concern for Joe Mansour and Sebel. This patent shows another means of safely relieving it: a frangible diaphragm, of asbestos paper. |
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Patented only in Germany as Patentschrift Nr. 838,490: Strahlanttriebseinrichtung, insbesondere für Modellflugzeuge and Spielzeuge Inventor: Max Arthur Lay Coote Applicant: V-Max Limited, London Application date: October 4, 1958 Publication date: July 28, 1960 Although the title grandly claimed to offer a "means of jet propulsion, with particular application to model aircraft and toys", Max Coote's invention itself was a much more narrowly focussed mechanism, being a pressure relief device in the form of a burstable nozzle. 943,991: Combustion Mixtures Inventor: Cecil Arthur Rassier Application date: December 11, 1958 Publication date: December 11, 1963 Applicant: D. Sebel & Company Limited This was Sebel’s fuel mixture, which they compounded when the price of the ICI fuel became prohibitive. It was still based on guanidine nitrate but in other components was substantially different from any of the formulæ in ICI’s patent 644,073. (Bert Judge gives an insider’s account of the formulation of this fuel in Roger Simmonds’ (Jet)X Files for December 2004.) |
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Acknowledgements - Original patents located, copied and compiled by Gerhard Everwyn; contributed by Terry Kidd |
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