Jetex was the American company, but these were _pulse_ jets, not _ram_
jets. They produced models of the F-89 Scorpion and the F-102 Delta Dart
themselves, and I'm sure they also had others. Plus hobbyists often used
Jetex engines in their own models in the fifties and sixties.
Hope this helps!
Stephen "FPilot" Bierce/IPMS #35922
{Sig Quotes Removed on Request}
On Nov 5, 8:28 pm, snipped-for-privacy@hotmail.com (Stephen Bierce) wrote:
Those were low power reloadable gas generators: a rocket, but less
power than the Estes blackpowder engines, with a longer burn time.
A good choice for light balsa freeflight planes.
He might have been looking for the actual model pulsejets of the
'60s, like the Dynajet or TigerJet. Used white gas or glofuel,
a spark plug for starting along with pressurized air.
Loudest things I ever heard, and yes, sometimes Cops would get
called when you fired them up. Worse than 'real' fullsized turbines
spooling up.
For Control Line speed events, or R/C, for the crazy.
A few seconds of operating, and the tube glowed red hot
http://www.youtube.com/watch?v=IJqkHJ2zWPY
but the audio doesn't really let you know how loud the damned
things were
**
mike
**
Thanks Mike! I remember now, the Dynajet was the American
one, which sold in England too. The British one was the Juggernaut,
very similar to the Dynajet, and one of which I owned in my youth.
As Stephen pointed out, they were of course pulse jets, not ramjets.
Many control-line modellers used them, notably at Fairlop airfield (long
since gone now) and the noise was unbelievable. Prince Bira used to
test his Formuila 1 cars there and his engines made far less noise !
I seem to remember model pulse jets were eventually banned from
model aircraft meets after some fatal accidents with them.
Jim Hawkins
Jim Hawkins
On Nov 5, 8:28 pm, snipped-for-privacy@hotmail.com (Stephen Bierce) wrote:
The Jetex engines were rocket engines, but with small nozzle and low
thrust so they could be used on lightweight freeflight models.
The Dynajets were pulse jets.
There was a third type, from a company called MEW. These were weird
things, of which there were no full-size aircraft equivalent. They
were basically a pressurized gas rocket, like the old CO2 cartridges,
but with two extra little improvements. They were heated by bleeding
off a little bit of the propane fuel to heat the container, adding a
little bit of total impulse, plus they had a thrust augmenter. This
drew in ambient air and accelerated it, reducing a high velocity low
thrust flow to a medium velocity, higher thrust. These were never
popular, however.
Now, of course, there are REAL turbojets and turboprops for model
airplanes, IF you have the money.
I remember seeing advertisements for one to be strapped to a bicycle
and about 36" to 42" long. It was to be made by the average machinist
and the advertisements appeared often in old Popular Mechaniics
magazines. I have a copy of the ad and if I can dig it out, I'll post
it on the binaries group.
Yep. Though a different company, and a larger version, that is the
same prinicple the old MEW engines used. I never bought one- don't
know if it would power a model or not.
Polytechforum.com is a website by engineers for engineers. It is not affiliated with any of manufacturers or vendors discussed here.
All logos and trade names are the property of their respective owners.