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I was fascinated to discover that turboshaft helicopters are heated by air that is bled off from the compressor ahead of the combustion zone. The heat of compression is wasted, but the effect of the combined inefficiencies even that far along are sufficient to produce nice warm air. This is a lighhtweight and technically simple solution to cabin heat, not necessarily, or even likely, an efficient one.
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There is no excuse for a land vehicle to weigh more than its average payload.
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