performance
Join Date: Oct 2003
Location: Canberra Australia
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clear_right
You haven't given enough clues to what looks like a trick question.
Are you considering All Up Weight AUW.?
Use a longer runway
Fit a smaller lighter engine.
Go to the Moon !!
Wait for a stronger wind
Take off down hill.
Use JATO
You haven't given enough clues to what looks like a trick question.
Are you considering All Up Weight AUW.?
Use a longer runway
Fit a smaller lighter engine.
Go to the Moon !!
Wait for a stronger wind
Take off down hill.
Use JATO
Moderator
Probably the point of the question relates to Vmcg considerations.
With a derated (but not a reduced thrust - as the rated thrust remains the same) takeoff, the lower rated thrust may result in a lower Vmcg permitting a lower min V1 and reduced ASDR. If the takeoff at a higher rated thrust previously was accel-stop limiting on a modest length runway, the use of a derate might permit an increase in RTOW.
This is an interesting curiosity and periodically comes up in PPRuNe discussions. For larger aircraft at light weights on shorter runways it can make for significant RTOW deltas. If you run a search on Mutt's posts you will find a few examples.
With a derated (but not a reduced thrust - as the rated thrust remains the same) takeoff, the lower rated thrust may result in a lower Vmcg permitting a lower min V1 and reduced ASDR. If the takeoff at a higher rated thrust previously was accel-stop limiting on a modest length runway, the use of a derate might permit an increase in RTOW.
This is an interesting curiosity and periodically comes up in PPRuNe discussions. For larger aircraft at light weights on shorter runways it can make for significant RTOW deltas. If you run a search on Mutt's posts you will find a few examples.
Last edited by john_tullamarine; 19th May 2004 at 01:06.
Join Date: Apr 2004
Location: vancouver oldebloke
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In some examples of the 320 ops,we were faced with limited T/Off wts off 32 @LBA(terrain limited),but if we elected to dept' off 14 with Flaps3-we had sufficient runway available to entertain Flex thrust
Join Date: Apr 2004
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Too True,but changing the runway(even with a tailwind)and increasing Flap(from1+f -3)increased the gross weight and gave you the Flex option...I know, off 14 the next highest point is the Alps!!
Cheers
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