==H engines=====Aircraft engines===*Lycoming** Lycoming H-2470 H-24 "hyper engine"*Fairey Aviation**Fairey Prince (H-16) (1939) - 1,500 hp**Fairey Monarch (1939) - H-24 2,240 hp*Klöckner-Humboldt-Deutz DZ 720 - H-32, 102.9 litres*Napier & Son, UK.
Leta 1917 je Napier & Son razvil W-12 Napier Lion za pogon letal.