Micro Rocket Motor and Model Jet Resources
MOTORS: Igniter

Jetex range  |  Imitators  |  Operations  |  Fuels  |  Accessories

MOTORS  > Accessories  > Fuse

Igniter fuse

Fuse tins

Jetex fuse
Bronze fuse tins Igniter fuse – required to ignite the pellets and alternatively known as wick – came in coiled lengths and was cut to size. The same fuse was used for all Jetex motors, regardless of size.

Initially, fuse was sold in small tins sealed with a length of branded tape (left). A later container was a larger and more elegant bronze-coloured tin (right).

Dethermaliser fuse

Dethermaliser fuse
  Jetex Dethermaliser Fuse served two purposes. Not only was it a conventional fuse with a “CONTROLLED BURNING RATE”, but it was also “THE IDEAL FUSE for lighting Jetex motor wicks in windy weather". (Whether it was wise to be flying Jetex models in windy weather was another question.)

With Jetex contest models achieving longer and longer flights, there was indeed a call for an effective means of bringing them back to earth prematurely, in order to ensure the motor was not lost along with the model. Since the Jetex engine was generally the most valuable part of the model, the dethermaliser purpose of the fuse was well conceived.

It appears that the burning rate was recalculated after the card was printed. The original ¾" has been emended by hand to 1", while the accompanying leaflet explains that “the burning rate is 1 in. per minute in still air when laid horizontally and 1 in. in 45 seconds when burning vertically or fitted in an exposed position on a flying model”.


- Text: John Miller Crawford
- Photographs: David Ranford
Jetex range  |  Imitators  |  Operations  |  Fuels  |  Accessories

  Terms of Use
Queries? Corrections? Additions? Please contact us.