747400sp
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Why So Long For A KC-135R To Get Into The Air?

Sun Sep 10, 2006 9:01 am

I was just looking at a video of a KC-135R and from the beginning of engine spool up to take off it took 1 min 1 sec to get off the ground. Now if was an A model or even an E model this would not be much of a shock but this was an R model with high by-pass CFM56. I know Dash-80 base planes are runway hogs, but I also thought by adding CFM56 to all the Dash-80 base planes, the KC-135R, C-135R, 707 700, KE-3,E-3F and E-6 would have better take off performus.
 
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kc135topboom
Posts: 11031
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RE: Why So Long For A KC-135R To Get Into The Air?

Sun Sep 10, 2006 2:29 pm

Which AFB? Is it high altitude? What is the temp.? Is it very hot (above 90F)? Is the KC-135R at it's MGTOW of 322,500lbs? Any of these factors will effect take off performance. Today, the KC-135R is considered a very good performer, with performance very similar to the B-757-200, even though it is more than 52,000lbs heavier when both are at MGTOW (B-757-200 MGTOW is 270,000lbs).
 
747400sp
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RE: Why So Long For A KC-135R To Get Into The Air?

Mon Sep 11, 2006 12:13 am

It took off from Grand Fork AFB 5 mintes after a heavy rain and it took off at a weight of 240000lb useing only 85% Ni.
 
columba
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RE: Why So Long For A KC-135R To Get Into The Air?

Mon Sep 11, 2006 12:49 am

Could you share this video ?
It will forever be a McDonnell Douglas MD 80 , Boeing MD 80 sounds so wrong
 
747400sp
Topic Author
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RE: Why So Long For A KC-135R To Get Into The Air?

Mon Sep 11, 2006 4:49 am

Yes go to www.flightlevel350.com and look up KC-135.
 
romeokc10fe
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RE: Why So Long For A KC-135R To Get Into The Air?

Mon Sep 11, 2006 5:47 am

They may have been using a reduced power setting to save wear and tear on the engines, this is a common practice.
 
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kc135topboom
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RE: Why So Long For A KC-135R To Get Into The Air?

Mon Sep 11, 2006 7:50 am

Quoting Romeokc10fe (Reply 5):
They may have been using a reduced power setting to save wear and tear on the engines, this is a common practice.

Yes, even we used reduced thrust take off procedures in the KC-135A/Q. It does reduce maintenance required on the engines, and the engine life is much, much longer.

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