We always had a symmetrical run up procedure (especially on ice)...on 4
engine types if you needed to go to max power on #2 engine, you also went to
max power on #3 engine. Of course during engine trims you could go full
power on all 4 or 8 for short periods of time.



For awhile maintenance was deemed incompetent and we had to get a pilot to
do max power runs. That was always a fiasco. The pilot didn't want to be
there and very seldom cooperated with maintenance, they refused to
understand the need to motor a green engine or to check for leaks BEFORE
starting the engines. They would also get irritated whenever they had to do
multiple starts and shutdowns because of problems encountered during the
maintenance runs.



On rare occasions I personally ran up C-135 and B-52's with J-57's with
water injection on all engines, it was an extremely loud rough ride. I have
also run up C-135 and B-52's with TF-33's, 707, 727, 737, and 747's, all
were great, but none gave that bone jarring, teeth rattling ride as a BUFF
in water.



If memory serves me right, the J-57 produced; 11,000 lbs of thrust dry and
13,000 lbs wet at MRT. While the TF-33 (depending on series) produced
17,000 lbs of thrust at MRT.




"jc" wrote in message
...
On Sun, 16 Dec 2007 17:48:24 -0600, "Eric" wrote:

If you want teeth rattling and the feeling that your heart is going to
vibrate though your chest, you should try a B-52G with all 8 burning water
(water injection for the uninitiated).

I never got to work on the SR-71, but their power runs were always
awesome.
Your teeth rattled from a 1/2 mile away.

A quick check says the -52 engines are rated at almost 57k lbs of thrust
but you
can only get "hands on" with two at a time. Only? Yah, right!

The Rolls engines on the 747's and L1011's that I worked on were in the
40,000
lb. area, while the later planes, such as the 767, kicked it up quite a
bit.
Get into the 777 and you're up there with two of the 52's engines at full
power.

But any of 'em will vibrate your filllings pretty good. The "old timers"
say
the piston engines rattled you around more than the jets... personally,
I'll
admit going back as far as 707's but I've run a couple of fairly large
radials.
They shook more but to me, they didn't seem to make the air vibrate like
the big
jets do. For as smooth as they are, that much 'stuff' moving around at
those
kinds of RPM, well, even trimming a 'little' engine on a DC-9 or MD-80 can
rattle you around pretty good. For most guys, the first time they
experience it
is not something they'll ever forget!
Cheers,
jc