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Path: utzoo!watmath!clyde!burl!ulysses!mhuxr!mhuxt!evans
From: evans@mhuxt.UUCP (crandall)
Newsgroups: net.aviation
Subject: Pulsejet jet belts..
Message-ID: <1179@mhuxt.UUCP>
Date: Thu, 3-Oct-85 18:19:03 EDT
Article-I.D.: mhuxt.1179
Posted: Thu Oct  3 18:19:03 1985
Date-Received: Fri, 4-Oct-85 06:24:38 EDT
Organization: AT&T Bell Laboratories, Murray Hill
Lines: 34

Somehow I think there may be some major problems with a pulsejet powered
jetbelt. I have had some experience with model airplane pulsejets as a
teenager and note that they are extremely inefficient as well as VERY
noisy. In the model airplane incarnation (the one we used was known as
the Dynajet Redhead wt was about 20 oz and thrust about 50 oz) these got
very hot (no moving cold air) and wold get cherry red if you didn't launch
in about 10 seconds. Getting them going was quite an experience - pump
air into them with a big tire pump, hit the ignition (an old ford spark
coil in our case) and head for the center of the ukie circle. They weren't
very fast, but you could attract people from miles around.

The H2O2 jet belts aren't new - Bell flew them in the early 60s (I believe
the movie debut was Thunderball). I have been trying to get info from
Williams Research (gas turbines for cruise missles) about their machines
from the late 60s and early 70s. If anyone has any information as to the
current state of the project I would be very interested. (they certainly
aren't doing anything now). For those of you who don't know about the
Williams/Bell jet belts they can best be described as fiberglas corsets
with an inverted 400+ pound of thrust turbofan pre-cruise missle engine.
Two large ducts redirected the thrust downward and control was similar to
the eariler H2O2 rocket belts. One interesting feature was a mortor deployed
parachute to counter the 0.0 L/D of the craft at unstart. Fueled up the
craft weighed in excess of 200 pounds, but this was no problem as idle
made the thing easy to "taxi" (one pilot claimed that the best fun to be
had with the turbine belts was to get a thrust setting where you could do
great 100 foot leaps like a kangaroo...)

Again - I would appreciate hearing from anyone with any info on such schemes
as I collect the stories. One of the biggest snakeoil jobs was a fellow who
was going to build one with a ducted fan powered by a turbocharged snowmobile
engine. -- just when you though Jim Bede held the record... :-)

		Steve Crandall
		ihnp4!mhuxt!evans


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