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PLANS: Jetex Scorpion 600
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Model Aircraft Plans for the Scorpion 600

Although one of the last Jetex motors to be marketed – and the most powerful – the Scorpion 600 attracted the interest of numbers of flyers. However, few plans for model aircraft using this motor appear to have been published.

We present here three very different models – one a fairly conventional duration flyer and the other two distinctly unconventional – that were specifically designed to make use of the unprecedented power of the Scorpion 600.

  What you'll find here:
The Drop-out
Space Ship
Castaway

The Drop-out by Don McGovern

Click image to view or download enlarged dimensioned plan and building and flying hints
The Drop-out
- Flying Models, Oct. 1966 (p. 17)

Jetex Radio??? You crazy?

Well, maybe, but why not? … just airlift it X-15 style, fuse it off and cut it free at high altitude. Try one!


That's how Flying Model introduced Don McGovern's super-duration design for Scorpion power. more >>

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Space Ship by Paul Del Gatto

Click image to view or download enlarged dimensioned plan
- All About Jetex, Paul Del Gatto, 1963 (p.48)




Paul Del Gatto had a fondness for high-speed, high-altitude craft with a spacecraft or missile-like configuration. The power of the Scorpion 600 allowed him to fly faster and higher than ever before.

In this model, he offered the option of a cut-down augmenter tube to boost the power even further. To aid retrieval, he added a fuse-operated parachute recovery mechanism.
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Castaway by John O’Donnell

Click image to view or download enlarged dimensioned plan
- Frank Zaic’s Model Aeronautic Year Book, 1957/58 (p. 176)

John O’Donnell, a contest-winning UK modeller, told Frank Zaic that Castaway was the “latest in quite a long line of Jetex powered models of assorted sizes, shapes and weight, produced by Hugh and I over the last few years. Obtaining ratios of five or six was quite easy, but any more was a different tale. Due to the limited power and heavy weight of the Jetex unit, a reasonable power/weight ratio of the complete model necessitated ultra light model structure. Eventually the high thrust line layout was adopted and thus enabled looping to be controlled without resorting to knife edge trimming methods. The Castaway has a 76.5% C.G. which gives reasonable stall behaviour, and the very high location of the Jetex discourages loops. Flight pattern should be a very steep spiral with rudder to provide turns and wing warps to give roll. Duration of about 1:30 to 1:40 off a single charge (7.5 sec. effective) can be obtained in evening conditions without apparent lift”.

To achieve a firmer mount for the motor than that supplied in the Scorpion kit, John used a thicker wall aluminium tube which was pushed into the socket at the back of the motor. This is the same procedure that Bill Henderson adopted with this motor.

The Scorpion's power was used to enable Castaway to achieve R.O.G. flight.

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Acknowledgements

Plan and information sources:
- Space Ship: book contributed by Doug Foster
- The Drop-out: article and plan contributed by Bill Henderson
- Castaway: plan and notes contributed by John Miller Crawford

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