The question is : Why don't they use an unnamed vehicle for testing new fuels? In lots of ways unmanned is actually simpler than maned, as the US army knows.

The question is : Why don't they use an unnamed vehicle for testing new fuels? In lots of ways unmanned is actually simpler than maned, as the US army knows. Using pilots for testing new things looks to me as extremely outdated, from the old macho days. In the old macho days you had to sacrifice people for learning things as simple as how to control the aircraft over the speed of sound. But today it is totally unnecessary.