The Fowler flap was invented around 1920 by one Harlan Davey Fowler, an engineer who was then in the employ of the U.S. Army. An internet search for his name turns up, in addition to various ...

Here’s What You Need to Remember: While the XF-90 was not a successful design, it gave U.S. engineers their first experience developing a clean-sheet jet with afterburning engines, ejections seats and ...