a safety pressure release at the front in the form of a disc against a pre-tensioned coil spring. Jet-X In 1986, Powermax in the UK launched a range of newly formulated size 50 fuel and wick under the Jet-X brand. In the latter half of the 1990s, the company introduced their own 'Z' series motors, corresponding to the original Jetex 35, 50 and 100. From August 1995 Jet-X motors, fuel and fuse were commercially imported into the US. Flying Models told its readers that "safe and viable rocket power for model airplanes is back". Rapier With the new millennium came another revival. A non-reusable motor, called Rapier, was launched. This has similar weight, thrust and duration to Jetex and many old plans for Jetex powered models were dusted off and built and flown with the new motors. The Rapier is a single use motor with a cardboard case and a ceramic nozzle. In appearance it is more like a model rocket motor than the original reloadable Jetex. Tendera In early 2020, another range of non-reusable motors was introduced, called Tendera. These are similar to the Rapiers, being one-time use motors having cardboard cases and ceramic nozzles. References External links Jetex.org This non-profit site is "the premier Web resource for information and advice about models powered by micro rocket motors, especially those exemplified by the Jetex series of engines". A collection of Jetex motors Scale models for Jetex/Rapier Model rocketry Rocket engines