the Classic Jetex archive
the Classic Jetex archive
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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. 

Jetex 50 augmenter tube kit (Sebel)...  ...  Jetex 50 augmenter tube

Jetex 50 augmenter tube kit [click B&W images to see full-size color illustrations] 
 

Jetmaster augmenter tube kit

Jetex Jetmaster augmenter tube kit, with the extension tube made in two parts that clip together [click image to see full-size color illustration] 

PAA-Loader 150 augmenter tube kit...

Jetex PAA-Loader 150 augmenter tube [click images to see full-size color illustrations] 
 

Performance tests were made by Aeromodeller in January, 1954. See our articles archive.

Augmenter tube tests...Scorpion augmenter tube tests...Table of augmented performance
Click to see larger images


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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