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DENEL Aviation Oryx Mk1 & Mk2 E-mail
Written by Anton Dyason - IPMS SA Media Group   
Sunday, 19 December 2004

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Leading aviation publications regard the Oryx as the best medium transport helicopter in the world. This is also the viewpoint of foreign flight crews, who had the privilege of flying this exceptional helicopter. Outside France, the SAAF was the largest user of the venerable, Aerospatiale SA 330 Puma. South Africa was the first export customer for this type and received the Puma, almost one year before Britain. Operations with the SAAF made the Puma a legend in the chopper world - at the time, regarded as the best medium transport helicopter, anywhere. From the snow capped mountains of the Drakensberg, the vast seas around South Africa, to the Bush War - many adventure seekers, seamen and soldiers owe their lives to this versatile helicopter.

Oryx Mk. 1

 
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The Alpha XH-1.
 The Oryx can trace its origins back to the Bush War. Despite the efforts of the gunship Alouette, the need for a dedicated gunship was recognized. Atlas Aircraft Corporation (now DENEL Aviation), produced an experimental attack helicopter, the Alpha XH-1. This helicopter was used for feasibility studies and could not serve any practical purpose - this led to the more powerful XTP-1 in April, 1987. Two XTP-1s were converted, and based on a Puma J airframe. Various weapons and other systems were tested on XTP-1 and paved the way for Project: Rooivalk! However, the dynamic flight components of the XTP-1, made Atlas realise what advantages, a so called upgraded Puma could have.

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Puma XTP-1.
A 330L Puma, no. 177, was converted to Oryx configuration, serial no. 1250, and used as a prototype - the results exceeded all expectations and the Oryx programme was launched. The sanctions era, encouraged the local aviation industry, to become self sufficient in producing helicopter components and with the knowledge to assemble pre-manufactured helicopters - led to the technical skill of producing complete Puma helicopters, should the need arise. This included complete airframes and dynamic components, such as gearboxes, rotor blades and turbine, hot section parts. Such experience resulted in the locally manufactured Topaz engine - the main component of the Oryx program. Leading aviation publications regard the Topaz to be similar in performance to the Makila, as fitted the AS332 Super Puma and AS532 Cougar. The engine intakes are fitted with locally produced dust filters and ensure higher efficiency and reliability. First examples were fitted with the latest dust filters as were then in use on the SAAF Puma. These units had a moveable auxiliary air intake on the front. A newly designed dust filter was later fitted without the auxiliary air intake. All current Oryx helicopters use the new filter. The Topaz gives the Oryx its phenomenal performance and it is the ONLY helicopter with the same performance at sea-level and 10 000ft! Should one of the engines fail, the remaining powerplant has sufficient power for the Oryx to complete its mission. If an engine fail in flight, the management system automatically advance the power setting on the remaining engine. This ensures the Oryx sustain flight with very little crew input, during such an emergency. Further, the chopper has no load restrictions - if it can fit in the cabin and the under carriage can take the load, or within the cargo hook's specifications, the mighty Oryx will lift it! A very valuable asset in Southern Africa's hot & high conditions. 

In order to demonstrate the Oryx phenomenal power, a 10 000ft challenge between the "Vlammies" ("Vlamgat" - burning backside, due to the afterburner section - all jet pilots in the SAAF are called "Vlamgat") and the Chopper boys, caused great sensation among aviation enthusiasts! The Oryx challenged a Mirage F1 to 10 000ft. Although, the F1 got there first by about 300ft, the Oryx shows by what degree, helicopter technology has progressed from the original Sikorsky VS300 design. The Oryx is a remarkable machine and probably the only medium transport helicopter, capable of such a challenge. The challenge was won by Cmdt D Prinsloo, OC 1 Sqdn.



Last Updated ( Sunday, 19 November 2006 )
 
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