On Sat, 5 Apr 2003, Ian Woollard wrote:
> >Technically, for it to be an *aero*spike, the spike must be truncated, and
> >after the wake closes, there must be some thrust contribution from base
> >pressure...
>
> Yes, also, at low altitude don't you have to inject gas into the base to
> maintain the pressure?
After the wake closes (which is a complicated subject all by itself), it's
usually found necessary to bleed a bit of gas into the base to keep base
pressure above ambient, until ambient drops to the point where this stops
being much of an issue. The historically-popular approach is to dump the
turbine drive gas there.
Henry Spencer
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