9V-SPJ
Topic Author
Posts: 669
Joined: Thu Dec 21, 2000 1:51 pm

Questions About B757 Climb And Runway Parameters

Tue Nov 01, 2005 10:13 pm

Hi everyone,

I have one question about the B757-200's climb performance. Would it be able to climb straight to 36000ft without step climbing after taking off at MTOW and sea level?
My next question is: what is the coefficient of rolling friction for a wet runway in the USA? I tried looking for the value on FAA's website, but found nothing.

Thanks in advance for the responses.

9V-SPJ
 
gkirk
Posts: 23355
Joined: Thu Jun 15, 2000 3:29 am

RE: Questions About B757 Climb And Runway Parameters

Wed Nov 02, 2005 2:32 am

Quoting 9V-SPJ (Thread starter):
I have one question about the B757-200's climb performance. Would it be able to climb straight to 36000ft without step climbing after taking off at MTOW and sea level?

More than likely I would think, but you'd have to take ATC and other traffic into consideration.
When you hear the noise of the Tartan Army Boys, we'll be coming down the road!
 
Rick767
Posts: 2613
Joined: Sun Jan 30, 2000 8:11 pm

RE: Questions About B757 Climb And Runway Parameters

Wed Nov 02, 2005 3:02 am

Bear in mind that the 757-200 has an MTOW of up to 115,650kg (255,000lb) for some models, and at this weight the optimum cruise altitude is about 32,000ft (so you really wouldn't want to climb much above that - 33,000ft or 34,000ft maybe).

The 757-200 with Rolls Royce RB211-535E4 engines has a thrust limited maximum operating altitude of 35,400ft at 115,000kg gross weight and additionally the buffet margin is narrow above 105,000kg at this altitude.

But say you took off at 100,000kg (220,500lb), then it should be no problem, but again you would still want to wait to be down in the 90,000kg gross weight region before stepping to this level in view of economy (optimum alt).
I used to love the smell of Jet-A in the morning...
 
taguilo
Posts: 73
Joined: Tue Aug 02, 2005 7:51 am

RE: Questions About B757 Climb And Runway Parameters

Wed Nov 02, 2005 3:29 am

Quoting Rick767 (Reply 2):
The 757-200 with Rolls Royce RB211-535E4 engines has a thrust limited maximum operating altitude of 35,400ft at 115,000kg gross weight and additionally the buffet margin is narrow above 105,000kg at this altitude.

What would mean if you keep climbing beyond that altitude? Should happen a reduction of power/speed and finally it would become impossible to hold leveled flight; or is it possible to have a flame out/engine stall even before the point where lift can't be sustained?

Tom
 
9V-SPJ
Topic Author
Posts: 669
Joined: Thu Dec 21, 2000 1:51 pm

RE: Questions About B757 Climb And Runway Parameters

Wed Nov 02, 2005 5:15 am

Thanks for the info.

9V-SPJ

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