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SAE ARP1702 Rev B

Current Revision

Defining and Measuring Factors Affecting Helicopter Turbine Engine Power Available

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This SAE Aerospace Recommended Practice (ARP) identifies and defines a method of measuring those factors affecting installed power available for helicopter powerplants. These factors are installation losses, accessory power extraction, and operational effects. Accurate determination of these factors is vital in the calculation of helicopter performance as described in the RFM. It is intended that the methods presented herein prescribe and define each factor as well as an approach to measuring said factor. Only basic installations of turboshaft engines in helicopters are considered. Although the methods described may apply in principle to other configurations that lead to more complex installation losses, such as an inlet particle separator, inlet barrier filter (with or without a bypass system), or infrared suppressor, specialized or individual techniques may be required in these cases for the determination and definition of engine installation losses. Some rotorcraft may use an alternate source of propulsion system power to supplement engine output shaft power delivered. If RFM performance includes the contribution of a Supplemental Power Unit (SPU), then the installed power available of the SPU should also be defined and measured, for which the power loss factors and methods described in this document may be applicable.

SDO SAE: SAE International
Document Number ARP1702
Publication Date Oct. 1, 2021
Language en - English
Page Count 13
Revision Level B
Supercedes
Committee
Publish Date Document Id Type View
Oct. 1, 2021 ARP1702B Revision
Sept. 1, 1998 ARP1702A Revision
April 30, 1982 ARP1702 Revision