• Short Summary

    A new advanced civil turbofan engine designated the M 45H has successfully completed its first run on the test bed at the Patchway, Bristol, works of the Bristol Engine Division of Rolls-Royce Limited.

  • Description

    A new advanced civil turbofan engine designated the M 45H has successfully completed its first run on the test bed at the Patchway, Bristol, works of the Bristol Engine Division of Rolls-Royce Limited.

    Like the Olympus 593 turbojet for the Concorde supersonic airliner, the M 45H is a collaborative project involving the Bristol Engine Division and the French aero-engine company SNECMA.

    In the 7500 - 9500 lb thrust class, the M 45H is currently under development for the West German VFW 614 44-seat short-haul airliner due to enter service in 1972. The aircraft will be powered by two M 45Hs rated at 7760 lb thrust at take-off.

    Initial performance targets for the engine for the VFW 614 are conservative in order to keep initial development time and cost to a minimum. Plans are in hand for the further development of the M 45 series to thrust levels nearing 10,000 lb.

    TECHNICAL BACKGROUND NOTE ON M 45H
    Design and manufacturing work on the M 45H project is shared between Britain and France, with SNECMA being responsible for the low pressure system and the Bristol Engine Division for the high pressure and combustor systems as well as for overall project management.

    By-pass ratio of the M 45H is 2.85:1 and the overall pressure ratio is 18.2:1. At the VFW 614 design cruise point of March 0.65 at 20,000 ft (ISA) the engine produce 2745 lb thrust with an SFC of 0.72 lb/lb/hr.

    An important requirement in the concept of the M 45H was to design an engine which would make possible competitive jet operation on the very short routes previously considered economic only with turboprop and piston-engined equipment.

    Choice of thermodynamic cycle for the M 45H was dictated by the need for high thrust at take-off, couple with low SFC at all flight conditions.

    Short-haul requirements are also reflected in the engine design, as it will spend some 30 per cent of its running time at take-off or climb ratings during typical operations with a complete take-off and landing cycle every 30 minutes.

    Under these extremely exacting operating conditions the M 45H turbine entry temperature are conservative, giving component and overhaul lives comparable to those of engines engaged in medium or long-haul flight profiles.

    Design emphasis of the M 45H is on a simple and rapid maintenance, particularly important in ensuring high utilisation and low operating cost.

    Less than five man minutes per flying hour is required on maintenance. This low figure again reflects the careful matching of engine cycle and design to the particular conditions of short-haul jet operation.

    The complete engine is designed as seven basic modules to permit major assemblies to be changed on-wing at operators' discretion.

    Bench testing, which will follow on the first run, calls for seven bench engines together with high-pressure and low-pressure compressor rigs. More than 4000 bench running hours will be completed before Type Approval is achieved early in 1972.

    Type Approval will be to the requirements of the Air Registration Board with LBA and FAA validation to follow, under the terms of the FAA/ARB reciprocal agreement.

  • Tags

  • Data

    Film ID:
    VLVA7HVIV1Q8X90GB8YHQR6D4PG5Y
    Media URN:
    VLVA7HVIV1Q8X90GB8YHQR6D4PG5Y
    Group:
    Reuters - Source to be Verified
    Archive:
    Reuters
    Issue Date:
    14/01/1969
    Sound:
    Unknown
    HD Format:
    Available on request
    Stock:
    Colour
    Duration:
    00:05:44:00
    Time in/Out:
    /
    Canister:
    N/A

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