A lot of research into cooling was done in the 1930s as aircraft became streamlined enough that the gains from this became significant, and by the start of WW2 a number of aircraft had not only reduced the cooling drag to insignificant levels but were achieving additional thrust from the cooling system. One example that comes to mind is the DH-91 four engined airliner. But this example also points out the main reason this approach was not used more widely - it requires very close integration of the airframe with a particular engine design, in this case an engine (Gipsy-12) designed for the aircraft and not used elsewhere.



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Noticed a very cool WA based company now moving as fast and a lot more quietly into EV at a ship/ferry level.

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