Re: model ramjets

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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.
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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:
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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 **

(Stephen Bierce) wrote:
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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:
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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.

wrote:
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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.

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check here <http://www.rqriley.com/gluharef.html
the bike is near the bottom if you go to DIY Galleries section

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you can also check <http://www.pulse-jets.com/pulse3.htm
for pulse jet plans, kits and assembled engines...there are still a couple of mfg around

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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.