The cancelled General Electric and Rolls-Royce F136 was an alternative engine for the F-35, which uses the Pratt & Whitney F135. The ratings discussed here place the two engines at the same official level. Alex Clarke recalls a Pratt & Whitney contact being pleased when the competing program ended, interpreting that reaction as concern about possible Rolls-Royce performance advantages. That is an industry anecdote, not a demonstrated comparison of the engines. The discussion contrasts additional power and capability with greater expense and distinguishes manufacturers' stated priorities from proof of reliability.
Notable Point · 1:43:48-1:47:46
The F136 and claims of greater engine performance
Official F135 and F136 ratings are contrasted with an anecdote about Pratt & Whitney's concern over its rival.