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Hachiouji-shi
3rd May 2004, 12:54
How much more thrust can one obtain by doing a bleeds off take off on a 737-300 ? How many percent increase in N1 % can one get ?

By the way, where do we find such information?

Thanks!

TopBunk
3rd May 2004, 13:40
Not sure about the thrust increase, but I seem to recall on the 737-200 bleeds off resulted in about 1000kgs extra weight to be lifted off the runway.

2FLYEU
3rd May 2004, 14:34
You can find the info on the 737-300 QRH Quick reference handbook....

BOAC
3rd May 2004, 21:56
AFAIK, the 'standard' Boeing 737 3/4/5 increase is 600kg, unless your performance guys calculate SPECIFIC aerodrome data when it will be more.

N1s are typically 1% higher bleeds off.

Hachiouji-shi
4th May 2004, 11:02
Thank you so much for all the postings. Managed to find the 1% increase in N1 in the QRH. But what about weight increases? Where can we get those information?

LEM
4th May 2004, 17:23
That depends on the runway analysis charts for the specific airports...

I'm afraid there's no fixed value, and as BOAC says it's in the range of 600-900kg more or less.