Northrop YF-17 engine runups
Edwards AFB.
1974
The GE YJ-101 engines had never flown on another aircraft, even an aircraft used as a testbed. Thorough testing provided a very reliable engine right from the start.
However, if they had tested it with another aircraft, they may have found out that there was a thrust defency at altitude, something they did not admit to, until the YF-17 lost the competition. As good as the YF-17 was it still missed a couple of marks that contributed to the loss to the YF-16.
Northrop photo
Northrop YF-17 engine runups
Edwards AFB.
1974
The GE YJ-101 engines had never flown on another aircraft, even an aircraft used as a testbed. Thorough testing provided a very reliable engine right from the start.
However, if they had tested it with another aircraft, they may have found out that there was a thrust defency at altitude, something they did not admit to, until the YF-17 lost the competition. As good as the YF-17 was it still missed a couple of marks that contributed to the loss to the YF-16.
Northrop photo