"Jim Baker" wrote in message
...

"DeltaDeltaDelta" wrote in message
...
A couple of days ago, I saw a picture of a DC-8, i think, taking off,
trailing thick black smoke from the engines (they weren't on fire). The
description of the picture said that it was using water injection to
give
more power for takeoff. I also came across this when reading about the
P-47.
How does that system work? I presume it's different for pistons and
jets.

Triple Delta

3D.....See Rapoports answer for the technical explanation. Aircraft such
as
the B-52 models prior to the G and the KC-135A used water injection
takeoff
thrust if the weight and weather demanded it. It was a tremendous boost
in
thrust in the B-52G and when the water ran out, a big deacceleration. As
you noticed, water injected takeoffs caused a lot of smoke.

JB

Should be "...Aircraft such as...prior to the H and the..."

JB