Accession Number : ADP006210

Title :   Analysis of Possible Transmission Arrangements Applicable for Driving Single or Twin Counterrotating Fans on Propfan Engines,

Corporate Author : FIAT DIVISIONE AVIAZIONE (ITALY)

Personal Author(s) : Battezzato, L. ; Turra, S.

Report Date : SEP 1987

Pagination or Media Count : 11

Abstract : A number of different designs of propfan engines are now being defined by the main engine manufacturers in the world. Some of these designs require a reduction gearbox between the LP turbine and the propfan; the propfan itself is conceived as single stage, variable pitch blade or double counterrotating stage variable pitch solution. In order to satisfy these requirements, the authors propose different mechanical arrangements of the reduction gearbox and, for given engine interfaces, compare their relative merits in order to eventually show the optimum solution. The comparison is made on the basis of various aspects, namely: lightness, quietness, life, reliability fail safety and maintainability. The analysis is carried out on the basis of the experience acquired by FIAT AVIAZIONE after thiry years of high level work on design, development and manufacturing of transmissions for aeronautical application.

Descriptors :   *AIRCRAFT ENGINES, *TRANSMISSION GEARS, BLADES, TURBOFAN ENGINES, PROPELLERS, AERONAUTICS, BLADES, ENGINES, INTERFACES, MAINTAINABILITY, MANUFACTURING, OPTIMIZATION, REDUCTION, SOLUTIONS(GENERAL), TRANSMISSIONS(MECHANICAL), TURBINES, VARIABLES.

Subject Categories : Jet and Gas Turbine Engines

Distribution Statement : APPROVED FOR PUBLIC RELEASE