The Flying Mechanic - Collin M. on Instagram: "The P51 Mustang's Supercharger. The P51 is one of the most iconic aircraft of WWII and beyond but it initially struggled as a altitude fighter because of the Allison V-1710 Supercharger. When paired with a RR Merlin engine it became a formidable foe in the skies. This is primarily because of the two-stage supercharger that was attached to the crankshaft. The low stage was used till about 19,000 feet (Depending on SN) and the High stage was used up a