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Augmenter Tubes
The makers of Jetex
originally offered two sizes of "augmenter
tubes," which were formed from thin aluminum
sheet; the forward end is bell-mouthed and
considerably larger in diameter than the Jetex
engine (one tube size is for the two 50
engines, the other for the 150 and 600), and
the edge of the bell is placed about even with
the rear of the engine
case.
When the jet is
operating, cool air is drawn into the tube
mouth and is expelled at the tail of the model
along with the hot gases. This air not only
cools the gases but contributes to thrust.
Figures show that the augmenter will increase
thrust from 20 to 30 per
cent.
Ignition is not
difficult with these tubes in place; they
prevent the sparkling fuse from burning the
model interior, too. To work successfully,
plenty of air must be able to reach the forward
end of the augmenter. This accessory is
normally used only inside closed fuselages, as
it would have quite a lot of air drag on an
open-fuselage Jetex-engine
installation.
 ... 
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Jetex 50 augmenter tube kit [click B&W
images to see full-size color
illustrations]
Jetex Jetmaster augmenter tube kit, with
the extension tube made in two parts that clip
together [click image to see full-size color
illustration]
 ...
Jetex PAA-Loader 150 augmenter tube [click
images to see full-size color
illustrations]
Other
Jetex Accessories
An interesting
Jetex accessory is this Dempster Turb-O-Prop, a Techni-Bilt Product from the Dempster Co.
in Kansas City. Billed as "the first practical replacement for rubber-band power",
it was spun by the exhaust gases from the 50-size pellets burnt in the unit in front
of the propellor. One of these sold on eBay in November 2002 for $170.50.
[Click image to see
full-size drawing]
[Click image to see
full-size color photo]
 
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