* Our Hagar is not a fond user of carb heat in piston prop engines......, but I am paranoid about it, having experienced the danger of carburettor icing in some of my old motor cars and motor-bikes..
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Permanently applied carburettor heat
The example is often quoted of the DHC Chipmunk which, when in military use, had its carburettor heat wired permanently on. This inevitably caused a permanent loss in engine power but it is instructive to reflect that the military decided that the loss in engine power and efficiency was a worthwhile trade off against the potential loss of aircraft resulting from carburettor icing. Considering that pilots with greater aptitude than the average GA pilot were operating these aircraft it is arguable that the military solution might have considerable relevance to GA operations and aircraft generally. Gipsy and Renault engines use heat from the side of the crankcase and if not selected will come on automatically with certain throttle settings. This heated air which is the air that has cooled the cylinders is less intense and has worked well with very little input from the pilots over the years.
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