B737 NG De-rated Climb
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more time at non-optimum level ,also more time in high drag configuration and more time in the climb---derates are nice for engine reliability
if this thread gets worse I'm outta here
if this thread gets worse I'm outta here
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Stoneman
Use derate will increase your fuel burn as it will take longer to reach your cruising/opt level.
To save fuel,no derate(not as good for engines though) and use NDP2(3-4% fule save compare to other ndp1).
Sorry i wont get into details, especially without the magic word
Use derate will increase your fuel burn as it will take longer to reach your cruising/opt level.
To save fuel,no derate(not as good for engines though) and use NDP2(3-4% fule save compare to other ndp1).
Sorry i wont get into details, especially without the magic word
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you did indeed.
Still,easiest is to believe us,burning more fuel by using less thrust,hence a longer time to reach higher level.
Derate is better in many ways...there are many threads concerning this...only bad thing is the fuel burn which is increased.
Still,easiest is to believe us,burning more fuel by using less thrust,hence a longer time to reach higher level.
Derate is better in many ways...there are many threads concerning this...only bad thing is the fuel burn which is increased.
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It wouldn't burn much more fuel as climb power switches at 15k feet. The savings to the engine would be way more valuable than the small fuel savings through 15k. Please correct me if I am wrong.
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Oh, since you've been so polite
Take it 'ab absurdo' - reduce power to just above cruise and look at the fuel burn when you are still at 10000ft 200 miles after take-off. As above, the quicker you get up there the less you burn. Generally climbing above 35000ft 'ish when the air is about as cold as it gets will not make so much difference
Take it 'ab absurdo' - reduce power to just above cruise and look at the fuel burn when you are still at 10000ft 200 miles after take-off. As above, the quicker you get up there the less you burn. Generally climbing above 35000ft 'ish when the air is about as cold as it gets will not make so much difference
Last edited by BOAC; 21st Jun 2010 at 16:06.
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I dont really know on a 737, but I got some info that might helpmax take off weight = 144,500–187,700 lb (65,500–85,100 kg)take off field length = 8,000–8,300 ft (2,400–2,500 m)above is for 737 800 aircraft
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Thank you. It depends on which climb speed 5 or 50 give. Whichever is nearer to the best r of climb speed will win.
I also suspect we are being trolled (no, boneman, not you)
I also suspect we are being trolled (no, boneman, not you
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two more question for you guys~~ thanks
i am flying 737NG ,and i have couple questions. as the manual says, the take-off thrust has a 5 minutes limit, could anyone tell me where is this limit come from, the reason for this and why it`s still a limit in de-rate and assume-temp take-off when the engines are not in full power. thanks~
