1、I. SAE AIR*127b 75 m 8357340 0004325 2 c, (5-zo AIR 1296 R E 0 RT Issued October 1975 I- Rev is e d I AEROSPACE Society of Automotive Engineers, Inc. I IV FOR MAT1 ON SMC 400 COMMONWEALTH DRIVE. WARRENOALE PA 15096 CONCURRENT DESIGN OF ENGINES AND SPECIFICATIONS OF STARTING SYSTEMS FOR HELICOPTERS 1
2、 PURPOSE This document recommends helicopter engine design decisions be made with full knowledge of their effect on the engine plus its starting system in a helicopter. 2. SCOPE It is recommended that ail helicopter engine development programs include an evaluation of engine starting requirements.
3、The evaluation should include starting requirement effects on helicopter weight, cost, and mission effectiveness. The evaluation should be appropriate to the engine stage of development. 3. EVALUATION PROCEDURE Helicopter engine development occurs in three stages. Starting system evaluation appropri
4、ate to each stage is recommended. 3.1 Technology Demonstrator Program: No specific application and no mission exists. Scalability is a prime consideration. Design analyses should be conducted to define best estimate plus error tolerance of starting requirements over a spectrum of mission requirement
5、s. Starting system technology work should accompany the Engine Layout Conceptual Design. 3.2 System Demonstrator Program: An application exists but the mission is not firm. Prior to design freeze, trade-off analyses should be conducted based on the anticipated application. The weight, cost and missi
6、on effectiveness penalties to the helicopter of various starting systems should be defined over a spectrum of mission requirements. 3.3 Development Engine Program: An application exists, a mission may be firm, and the engine will be fully qualified. Significant unanticipated helicopter penalties may
7、 be imposed by starting system requirements after the engine design freeze and during the helicopter development program. Trade-off options should be evaluated and engine design changes may be made. PREPARED BY SAE COMMITTEE S-12, HELICOPTER POWERPLANT Copyriht 1975 by Society of Automotive Engineers, Inc. All rights reserved.
