General Description

The first Jetex ever sold, along with the 100, from June 1948. The chamber is closed by means of four hard to manage coil-spring loaded wire clips.

This engine could hold either one or two propellant pellets. With a single charge, duration is 15 seconds, which can be doubled to 30 seconds with two pellets.

Regrettably, this is one of the models for which we have almost no information. It appears to be identical to the 350/600A, although somewhat smaller in size. Perhaps you can help.

Historical Notes

The Jetex 200 went on sale in June 1948, with the model 100.  These were the very first Jetex engines sold.

Remarks

Information from lab static tests of the 200 engine is given on our overview Motors page.

Suitable Model Aircraft

Performance Specifications

Data posted in green is from original factory packaging and instruction sheets
SI (metric) units provided in brackets
Data in red indicates extrapolated information, and must be regarded as approximate, at best

Additional Illustrations

(click image to see full size box)

This diagram is from the original Jetex 200 instructions.  Thanks to Howard Metcalf for all these illustrations.

(click image to see full size drawing)

This is a laboratory thrust curve showing Jetex 200 performance.
(From Aeromodeller's extensive test report, Nov 1953)
Note that in this 2-pellet configuration the thrust has a distinct valley as combustion moves from one pellet to the next, and thrust peaks after each new pellet gets going. It requires 5-7 seconds for each succeeding pellet to taper down, ignite the next, and resume "average" thrust levels.
Also note that there are significent variances, frequently of 25%, between test runs, due to a variety of reasons. See propellant resources for more details on fuel combustion.
(Click image to see larger graph)