CIRSTEL BREAKS HELICOPTER CONVENTIONS, MIDDLE EAST/AFRICA

TEXT:An SAAF Alouette III technology demonstration helicopter equippedwith a new tailboom without a conventional tailrotor or afenestron was shown by Denel Aviation.The project is known as Cirstel (Combined InfraRed Suppression andTail rotor Elimination). Initial research and development workbegan in 1987 and construction of the prototype started in 1993.The demonstrator is due to make its maiden flight "in the next fewmonths," according to project engineer Nols Fonternel. The workwas conducted by Denel under an SAAF technology contract. It wasadministered by Armscor.While Cirstel has some similarities to the McDonnell Douglas NOTAR(NO Tail Rotor) system, it is a different design, Fonternel said.Although, like NOTAR, it uses the Coanda effect of the enginebleed-air to eliminate the need for a tail rotor while alsoincorporating suppression of the exhaust's infrared signature.The Cirstel principle splits the high pressure air from the enginefor use in the Coanda slots, while the low pressure air isbled-off for the tail thruster and to mix and cool the engineexhaust. The thruster nozzle is a Denel-patented clamshell design,unlike McDonnell Douglas' `rotating can' concept.Denel intends "to apply the Cirstel to a new helicopter design, tobe developed - hopefully - with a new partner," Fonternel said.

The complete article appears in the following publication:
Publication Title	Jane's Defence Weekly
Publication date	Nov 20, 1996
Section	MIDDLE EAST/AFRICA
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