Re: Old 707's

Date:         26 Dec 97 03:28:49 
From: (David Tyler)
Organization: Air Force Phillips Lab.
References:   1 2 3 4 5 6
Followups:    1
Next article
View raw article
  or MIME structure

hackettNO* (Kim Hackett) writes:

>>My father used to talk about "water wagons" -- early 707s which used
>>water injection for additional takeoff thrust.  Despite keeping my ears
>>open for any tibits about these beasts, I've heard nothing about them.
>>Were they real?  Can anyone provide details about them?

>The early 707s, the KC-135A with J57 engines, and the B-52G use water
>injection for additional takeoff thrust.  The B-52G has a water tank in
>the fuselage forward of the wing.  The water injection lasts about 45
>seconds.  Not all takeoffs use water injection.  On takeoffs with water
>injection, all of the water must be used, otherwise it would freeze at
>altitude.  I think the water capacity on the B-52G is about 3000 lb, if
>I remember correctly.

an interesting bit of apocrypha that used to circulate amongst tanker
drivers was that the original configuration for the -135 water injection
was one pump for the left engines and one pump for the right...  after
someone realized just how dicey it was during a max togw takeoff when
one pump suddenly failed, the configuration was changed to one pump for
the inboards and one for the outboards...  :)

we AWACS crews used to watch with raised eyebrows as water-wagon tankers
would take off in the middle a hot afternoon in riyadh, carrying nearly
a full load to the orbiting E-3.  they'd put out a furious amount of smoke
and noise, and roll, and roll, and roll...  finally, out where we were
sure the runway must be running out, they'd waddle into the air.  whew.

-David W. Tyler               "It seems you feel our work is not
-USAF Phillips Laboratory         of benefit to the public."
-Albuquerque, New Mexico                         --Rachel