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There was an earlier thread about this, but I didn't wanted it to be killed as a zombie
Premise of the thread - instead of developing turbo-chargers, the turbo-compund engines are developed for use in aircraft. The historical engines with integral superchargers (R-1830/2600/2800, V-1710 etc) retain those.
Benefits of turbo-compounds being more power on same setting (RPM, manifold pressure) and same fuel consumed, no intercoolers and no plenty of ducting needed; benefits of turbo-chargers being greater power at really high altitudes. USN/USMC did not use turbo-charged egines in ww2, however, apart from experiments.
What Allied AFs could possibly gain, what would they loose? Possible/feasible Axis reply (if needed)?