In article .com,
"jmk" wrote:

Cartridge start was also used on jets.

The British Camberra used them. It's a high altitude spy plane that we
licensed the design for, so that we could turn it into the U-2. One of
the changes we made was to get rid of the cartridge start, because the
huge mass of black smoke was considered "not high tech."

Canberra and U-2 were totally separate aircraft! U-2 was a
single-engine, indigenous Lockheed design, based on high-performance
sailplanes of the day.

Canberra was a twin-engined British design for a high-altitude bomber.
The Martin Co. modified the Canberra into the B-57; the special
reconnaisance aircraft was the "RB-57D/E," which looked somewhat like
the B-57, but with much longer wings and different engines.