[Jukka Juutinen]

And when did the Twin Wasp become an R-1340??? And comparing even the R-1830 (=Twin Wasp) and the Hercules is absurd at best since the fomer topped at around 1350 hp, the latter at over 2000 hp. The closests realistic comparison are the the R-2600/the Hercules and the R-3350/the Centaurus. Even the larger R-4360 (=Wasp Major, poppet valves) topped at about 3000 hp with 100/130 fuel (3500 hp and over ratings required higher PN fuel) while the Centaurus achieved the same on the same fuel from over 1000 cu.in smaller displacement with at least double the TBO.