The Boeing 2707 was cancelled in 1971 , putting an end to further work on the GE4 .
The GE4 was the most powerful engine of its era , producing 50,000 lbf ( 220 kN ) dry , and 65,000 lbf ( 290 kN ) with afterburner .
The Boeing 2707 was cancelled in 1971 , putting an end to further work on the engine .
The GE4 was the most powerful engine of its era , producing 50,000 lbf ( 220 kN ) dry , and 65,000 lbf ( 290 kN ) with afterburner .