There were three other proposals for air breathing hypersonic
> propulsion I, II, and III I made, and then there was a fourth under
> the title "Could we just circulate the air in scramjet propulsion?"
> I'll refer to that fourth one as "Proposals for air breathing
> hypersonic craft. IV". Then this next one will be "Proposals for air
> breathing hypersonic craft. V".
> Suppose we made the intake path for the supersonic, hypersonic air be
> in the form of a J-bend pipe. Then the incoming air would first
> initially be moving backwards with respect to the craft at high Mach
> speed but the J-bend would direct this air forward so that with
> respect to the craft it is now moving at zero relative velocity.
Huh?> propulsion I, II, and III I made, and then there was a fourth under
> the title "Could we just circulate the air in scramjet propulsion?"
> I'll refer to that fourth one as "Proposals for air breathing
> hypersonic craft. IV". Then this next one will be "Proposals for air
> breathing hypersonic craft. V".
> Suppose we made the intake path for the supersonic, hypersonic air be
> in the form of a J-bend pipe. Then the incoming air would first
> initially be moving backwards with respect to the craft at high Mach
> speed but the J-bend would direct this air forward so that with
> respect to the craft it is now moving at zero relative velocity.
That's like saying the top of a wheel or caterpillar track
stops relative to the vehicle. In fact it moves forward
at twice the speed of the vehicle relative to the ground.
Don't give up your day job.