The North American Aviation P-51 Mustang is an American long-range, single-seat fighter and fighter-bomber used during World War II and the Korean War, among other conflicts. The P-51B had a Packard built Rolls Royce Merlin 61, V-1650-3 which was rated more than 490 HP more than the Allison V-1710 at 25,000 feet! Other mods included in the P-51B were increased loads to 1,000 lbs under each wing, no more nose mounted guns (no room with the Merlin) and a redesigned belly scoop. There were many other changes firewall forward to accomadate the new engine. The Merlin used an updraft induction system, so the intake was moved below the spinner and an intake trunk installed behind the cowlings.
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