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	PATENT SPECIFICATION 907,218 Inventors: CECIL ARTHUR RASSIER and JOSEPH NAIME MANSOUR.
	Date of filing Complete Specification: Aug. 24, 1959. Application Date: Aug. 25, 1958. No. 27258/58. Complete Specification Published: Oct. 3, 1962. COMPLETE SPECIFICATION Improvements in or relating to Reaction Motors We, D. SEBEL & COMPANY LIMITED, of 177, West Street, Erith, Kent, a British Company, do hereby declare the invention, for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement:—
	The present invention relates to small reaction motors of the rocket type suitable for use in a model aircraft or other vehicle or for other purposes. Such motors frequently comprise a casing of substantially cylindrical configuration closed at the front end and carrying at the rear end a cap secured thereto by a spring yoke or by screw threads or the like this motor being disclosed on Patent No. 642,689. This cap carries the jet orifice and when the motor is operating the joint between the cap and the casing motor is exposed to the high temperatures and corrosion effects of the burning gases. Since these motors are made as light as possible the wall of the casing is necessarily thin and from time to time if the joint between the cap and the casing is not properly made the gases leak between the cap and the casing. These burning gases escaping between the cap and the casing frequently cause the structure of the vehicle to be set alight and destroyed or at least cause burning of the casing. Furthermore since the cap overlies the casing forwardly directed gas jets are produced which have a breaking [sic] effect upon the plane or other vehicle. An object of the present invention is to provide a construction of motor which safeguards the vehicle from being burned and prevents such braking effect in the event of leaks taking place between the cap and the casing. According to the present invention there is provided a reaction motor of the type in which the jet orifice is carried in a cap detachably secured to the casing of the motor in which the propulsion gases are generated, wherein the cap has a lip which is engageable with the outer surface of the jet nozzle end of the case and wherein a flange which extends around the periphery of the casing is located at the jet orifice end of the casing the flange being directed rearwardly and adapted to overlie the lip of the cap so that the lip is located in the space formed between the flange and the outer face of the casing. Conveniently the flange is flared outwardly and rearwardly so as to provide a streamlined contour to minimise its resistance to the air.		These burning gases escaping between the cap and the casing frequently cause the structure of the vehicle to be set alight and destroyed […] An object of the present invention is to provide a construction of motor which safeguards the vehicle from being burned


	For a better understanding of the invention and to show how the same may be carried into effect reference will now be made to the accompanying drawing which is a part sectional view of a reaction motor of the rocket type incorporating a flange according to the present invention. The casing 1 of the rocket motor comprises a cylindrical body closed at one end 2 and adapted to receive at the other and rearward end 3 a cap 4 in which is formed or mounted a nozzle 5 in which there is located a Jet orifice 6. This cap 4 is secured to the motor casing 1 by means of a spring strap 7 pivoted to the cap via mounting lugs 8, the yoke 9 of the strap being adapted to spring into a recess 10 formed at the forward end 2 of the casing. An annular back plate 11 is interposed between the cap and the annular end wall 12 of the rearward end 3 of the casing 1. Mounted on the casing close to its rearward end 3 is a conical sleeve or flange 13 whose narrow end 14 is secured to the casing rearward end 3. The wider end 15 of the flange 13 is directed rearwardly and is so positioned that when the cap 4 is applied to the casing the lip 16 of the cap lies in the space formed between the conical flange 13 and the rearward end 3 of the casing.
	In the event of the combustion gases leaking between the cap 4 and the casing 1 of the motor they are prevented by the flange 13 from dispersing radially of the casing and are deflected in a rearward direction. This prevents the combustion gases setting light to the body of the plane or other vehicle (not shown) and also prevents the gases from hindering the passage of the vehicle through the air, by arresting the production of forwardly directed gas jets. If desired the flange 13 may be detachable from the casing 1 and be made to form a tight sliding fit thereon so that it can be retracted from its operative position (shown in the drawing) while the cap 3 is being secured to the casing 1 and can then be slid up the casing 1 to fit snugly against and over the lip 16 of the cap 6. WHAT WE CLAIM IS:— 1. A reaction motor of the type in which the jet orifice is carried in a cap detachably secured to the casing of the motor in which the propulsion gases are generated, wherein the cap has a lip which is engageable with the outer surface of the jet nozzle end of the case and wherein a flange which extends around the periphery of the casing is located at the jet orifice end of the casing the flange being directed rearwardly and adapted to overlie the lip of the cap so that the lip is located in the space formed between the flange and the outer face of the casing. 2. A reaction motor as claimed in claim 1, wherein the flange is flared outwardly and rearwardly so as to provide a streamlined contour to minimise its resistance to the air. 3. A reaction motor as claimed in claim 1 or 2, wherein the flange is a sliding fit on the casing, the arrangement being such that the flange is movable relative to the casing between a retracted position and its operative position so as to facilitate the attachment or removal of the cap. 4. A reaction motor, substantially as hereinbefore described with reference to the accompanying drawing. For the Applicants: ARNOLD TICKNER, Chartered Patent Agents, Alexander House, 239/241, Shaftesbury Avenue, London, W.C.2. Leamington Spa: Printed for His Majesty's Stationery Office, by the Courier Press (Leamington) Ltd.—1962. Published by The Patent Office, 25, Southampton Buildings, London, W.C.2, from which copies may be obtained.		In the event of the combustion gases leaking [they] are deflected in a rearward direction. This prevents the combustion gases setting light to the body of the plane


	Acknowledgements - Original patents located, copied and compiled by Gerhard Everwyn; contributed by Terry Kidd

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