performance
Joined: Oct 2003
Posts: 1,300
Likes: 0
From: Canberra Australia
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
Fleet Manager
Joined: Apr 2001
Aviation Qualifications: ATPL
Posts: 7,447
Likes: 310
From: various places .....
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.
Joined: Apr 2004
Posts: 258
Likes: 0
From: vancouver oldebloke
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
Joined: Apr 2004
Posts: 258
Likes: 0
From: vancouver oldebloke
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
Cheers
