Back in the 1980’s Northrop privately funded the building of the F-20 Tigershark. A variant of the F-5 it was initially designated the F-5G. The Tigershark first flew in 1982 and only three aircraft were ever built.
Watch the F-20 Tigershark in action
The F-20 had a single General Electric F404-GE-100 turbofan engine with 17,000 pounds of thrust which was about 40 percent more powerful than the twin-engined F-5E. It was touted by Northrop as being the world’s premier fighter jet claiming it would even outperform the F-16A Falcon at a lower cost.