ALTITUDE supercharging of aeroplane engines by means of turbo‐blowers driven by exhaust‐gas turbines differs from ordinary charging of internal combustion engines because the process is much more accentuated. Whilst the output of stationary engines can be increased by 50 per cent, that of rail‐car engines by 80 per cent, by supercharging, an aeroplane engine, to give its full output at 12,000 m. altitude, has to be supercharged so as to give four times its output without supercharging. Thus altitude supercharging offers certain peculiarities.
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