> every one has seen the auctions on Rocketryonline
> but has any one ever seen a bid placed on one?
> does any one know what jetex is, ive seen the pics and cannot figure out how
> those are rocket related other than the word rocket in there occasionaly.
> -michael brown
It's a little reloadable rocket motor, using small gas generator
pellets and a fuse to ignite. The current "50" sized ones put out a few
ounces of thrust for somethign on the order of 10 seconds. They are
primarily used for FF sport flying. They used to be a big deal for FF
competition, but they were out of production for 20 years. There used
to be many sizes, the "35" "50" "50HT" "150", and the "600". The "50"
was the most common, and work on 18" span HLg's. The 150 would fly a
pretty big model, p-30 sized or so. These were the ones used in
The biggest difficulties were leakage around the rear seal (old
asbestos gaskets were terrible, the new silicone ones are very much
superior) that tended to set the airplane on fire, and getting the fuse
wire out of the nozzle witout burning your fingers too badly.
The guys advertising them on ROL actually have quite a bit of good
information, if you can tolerate the "everything was better in 1955"
attitude. The current "50" sized motor is pretty much the same, the
propellant is not as good. They're fun to play with. Don't touch the
motor for about 10 minutes after the flight.