The Aeronautical Journal, Volume 73Royal Aeronautical Society, 1969 - Aeronautics |
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Page 652
Figure 18. Noise sources of a lift - fan engine with high by - pass Figure 19. Do P 378-3 . Noise level during VTOL . Take - off ratio . DISCUSSION Fan Lift in VTOL Design R. G. WEST ,. x [ m ] A y [ mJt 90 PNdB A90 = 10 km2 95 1000 100 ...
Figure 18. Noise sources of a lift - fan engine with high by - pass Figure 19. Do P 378-3 . Noise level during VTOL . Take - off ratio . DISCUSSION Fan Lift in VTOL Design R. G. WEST ,. x [ m ] A y [ mJt 90 PNdB A90 = 10 km2 95 1000 100 ...
Page 659
... noise is rapidly attenuated by the atmosphere with increasing distance from the engine . In the rearward , or downward engine noise field , which is obviously the more important due to the lift - fan installa- tion , jet noise is the ...
... noise is rapidly attenuated by the atmosphere with increasing distance from the engine . In the rearward , or downward engine noise field , which is obviously the more important due to the lift - fan installa- tion , jet noise is the ...
Page 933
improvement is not jeopardised by excessive installation losses . NOISE Engine noise research has not been neglected by any means during the past decade and significant reductions of engine noise levels have been achieved . But ...
improvement is not jeopardised by excessive installation losses . NOISE Engine noise research has not been neglected by any means during the past decade and significant reductions of engine noise levels have been achieved . But ...
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Aero aerodynamic aerofoil Aeronautical Journal aeroplane air transport airline airport angle application associated Aviation blade boundary layer British BRITISH AIRCRAFT CORPORATION cargo CEng civil Civil Air Transport configuration conventional cost cross-coupling dynamic effect engine equipment fibres field Figure flight flow flying FRAeS fuselage future Harrier Hawker Siddeley Aviation helicopter hover Illustrated increase industry lecture lift lift-fan London Mach number man-powered flight mechanical ment methods military NASA TN noise level obtained operation organisation outer space paper passengers performance pilot plate polymers possible present problem programme propulsion ratio rotorcraft Royal Aeronautical Society Royal Air Force satellite shown in Fig speed STOL structure Sud Aviation supersonic tail rotor take-off technical techniques Technology temperature thrust tion traffic turbine V/STOL vector vehicle velocity VTOL weight Westland wing