The latter system, when engaged, was capable of increasing engine output by above the rated altitude to increase high-altitude performance.

Though it lacked sufficient high-altitude performance, it performed well at medium and low levels.

Version with larger wings for improved high-altitude performance.

The increase in area was to increase high-altitude performance.

While no world-beater as a fighter, the P-43A had a very good high-altitude performance coupled with an effective oxygen system.

With only a single-stage supercharger, high-altitude performance fell off rapidly.

Even before the Fw 190 A was put into service, its high-altitude performance was seen to be deficient.

This gave a better high-altitude performance and raised the top speed by around 70mph.

The resulting engine had better high-altitude performance and entered production in 1938.

This increased the amount of oxygen in the fuel mixture, and thereby improved high-altitude performance.