I was browsing East Coast Rocketry online model rocket engine
museum,when I saw that one of the old vintage mod roc companies was
located in Albany, NY: Uni-Jet.
The engines on Dale's site are labelled D1, D2, D3, D4, and E2.
Does anyone know anything about this company? The addresses on the
website are private homes in residential neighborhoods, and the only
thing I can find by Googling is a 1965 ad on Ninfinger's site.
Oh yeah, here is the link to the website:
I have some of these motors in my collection. The D and E codes have NOTHING
to do with the current D and E class motors. They are close to the extes "T"
series motors in size. I don't recall the actual current equivalents, but
they can't be more than A motors.
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In the first edition of Harry Stine's book he lists the D-1,2 and 3
motors as 1/2A .5 motors (that's POINT 5 pounds, about 2 newtons) and
lists the total impulse as 0.10 lb/sec,which would be 1/4A but there
was no 1/4 A officially at the time of that printing. The D-4 was
listed as 1/2A .7-4 with a total impulse of 0.15 lb/sec. No idea about
the E motor.
Thanks for the info guys,
I have had some luck in my research so far:
The two addresses listed on the rocket motor boxes still exist. They
are both homes in residential areas: The Weymouth St address is a
modest 1930's-ish home, and the Ridge Terrace address is a mid 1960's
raised ranch. The Weymouth St home does have an old wooden detached
garage. I could not help wondering if this little shack was once a
rocket R&D lab...
I also found an interesting tidbit in an old issue of Model Rocketry
Magazine (Vol. III, No. 9, July 1971, p28) as part of a G Harry Stine
article describing the history of model rocket motors:
"In 1964, there was a brief return to the 'half inch engine' as we
tended to call it. George Molson of the Uni-Jet company started to
produce a little model rocket engine that was .500" in diameter and
2.25" long. They were listed as :
1/2A.5-2, metric equivalent 1/2A2-2
1/2A.5-3, metric equivalent 1/2A2-3
1/2A.5-0, metric equivalent 1/2A2-0
1/2A1-4, metric equivalent 1/2A4-4
These engines were NAR-certified in late 1964. However, George Molson
used a very different and highly unusual solid propellant, and the
reliability of his Uni-Jet engines suffered as a result. The thrust
time curve was dependent on the number of days that had elapsed since
the engine had been made. At a certain time after manufacture, the
thrust time spike at ingition became very high... and the nozzle left
the party. Sometimes the paper casing ended up looking like a peeled
banana. Molson could not solve the problem, and the Uni-Jets left the
market in late 1965, yet they became a legend due to their small
I wonder just what was that "very different and highly unusual solid
I would also guess that the nickname "Puny-Jets" was created by
rocketeers who were used to full A and B motors. 1/4A is pretty 'Puny'
I am still searching for additional info, esp copies of any Uni Jet
catalogs, literature, or (hope against hope) plans for their kits.
firstname.lastname@example.org (Dale Greene) wrote in message
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