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# Winglets Interview Question 737NG

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# Winglets Interview Question 737NG

9th Feb 2010, 11:06
#1 (permalink)
Thread Starter

Join Date: Jan 2007
Location: Djakarta
Age: 31
Posts: 77
Winglets Interview Question 737NG

Did a search but need some answers please.

1. Do winglets increase the RTOW
2. Reduce the take-off run
3. What segment of the take-off do winglets give the most benefit.
4. Could an a/c depart with a winglet missing and what would be the penalties

Thanks arrow
9th Feb 2010, 12:24
#2 (permalink)

Join Date: Aug 2001
Location: Europe-the sunshine side
Posts: 755
maybe this should help:

Aero 17 - Blended Winglets
9th Feb 2010, 12:25
#3 (permalink)

Join Date: Feb 2006
Location: A long way from home
Age: 39
Posts: 372
1. Theoretically - yes (if the limit is imposed by lift available. Limit is more likely to be due to structural issues). In practice (legally) probably not. Athough I don't know for sure.

2. See above.

3. Dunno.

4. Yes. Check the MEL for your particular aircraft first though. Penalty would be slightly increased fuel burn (I'm told that winglets reduce burn by 7%) And aileron trim issues.
9th Feb 2010, 18:13
#4 (permalink)

Join Date: Sep 2009
Location: unknown
Posts: 190
3

3. I think it would be the part where the wing tip vortices would be maximum. I am guessing it's immediatly after lift off and climb. Basically what winglets do is reduce the wingtip vortices and there by reduce induced drag.

Induced Drag= Lift(squared) x Wing Span(squared) / Velocity of Aircraft(squared).
9th Feb 2010, 23:33
#5 (permalink)

Join Date: Aug 2009
Location: Australia
Posts: 91
Induced Drag= Lift(squared) x Wing Span(squared) / Velocity of Aircraft(squared).
Don't you mean:

[0.318(CL^2/pi*AspectRatio*efficiencyfactor)]*q*s

J
10th Feb 2010, 10:06
#6 (permalink)

ECON cruise, LR cruise...

Join Date: Apr 2002
Location: MIRSI hold - give or take...
Age: 47
Posts: 564
1) Depends - if you're 2nd segment limited, they will.
2) Theoretically, yes. Weather Boeing have bovvered with supplying the new data is another kettle of fish.
3) 2nd segment
4) Yes - CDL, notr MEL, applies. Weight restrictions galore etc etc, but easily doable (unless you're close to margins anyway)

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