<P> The Pratt & Whitney F135 powers the F - 35 . An alternative engine , the General Electric / Rolls - Royce F136 , was being developed until it was cancelled by its manufacturers in December 2011 for lack of funding from the Pentagon . The F135 and F136 engines are not designed to supercruise . However , the F - 35 can briefly fly at Mach 1.2 for 150 miles without the use of an afterburner . The F135 is the second ( radar ) stealthy afterburning jet engine . Like the Pratt & Whitney F119 from which it was derived , the F135 has suffered afterburner pressure pulsations , or ' screech ' at low altitude and high speed . The F - 35 has a maximum speed of over Mach 1.6 . With a maximum takeoff weight of 60,000 lb ( 27,000 kg ) , the Lightning II is considerably heavier than the lightweight fighters it replaces . </P>
<P> The Pratt & Whitney F135 powers the F - 35 . An alternative engine , the General Electric / Rolls - Royce F136 , was being developed until it was cancelled by its manufacturers in December 2011 for lack of funding from the Pentagon . The F135 and F136 engines are not designed to supercruise . However , the F - 35 can briefly fly at Mach 1.2 for 150 miles without the use of an afterburner . The F135 is the second ( radar ) stealthy afterburning jet engine . Like the Pratt & Whitney F119 from which it was derived , the F135 has suffered afterburner pressure pulsations , or ' screech ' at low altitude and high speed . The F - 35 has a maximum speed of over Mach 1.6 . With a maximum takeoff weight of 60,000 lb ( 27,000 kg ) , the Lightning II is considerably heavier than the lightweight fighters it replaces . </P>
what is the top speed of the f-35
what is the top speed of the f-35
over Mach 1.6
over Mach 1.6