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Fragrant Harbour Wannabes A forum for those applying to Cathay Pacific, Dragonair or any other Hong Kong based airline or operator. Use this area for both Direct Entry Pilot and Cadet-scheme queries


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Old 28th May 2008, 19:43   #1 (permalink)
MilPilot
 
Join Date: Mar 2008
Location: Europe
Posts: 65
A couple of CX interview Qs

Anybody have some good answers?

1. What are the limitations on the 747 with the loss of one yaw damper?

2. What is the reason for dihedral on the 747?
Normally one would think stability, but is it more to help gravity feed?

3. What are all the advantages of Wide chord fan blades?
I came up with FOD resistancy, stronger blades/less flex/no need for snubbers, better aerodynamic efficiency

Last edited by MilPilot : 28th May 2008 at 20:39.

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Old 31st May 2008, 16:46   #2 (permalink)
 
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Anybody? Somebody must know!!
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Old 31st May 2008, 17:50   #3 (permalink)
 
Join Date: Jul 2007
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No limits that I know of. Yaw damper #1 pwrd by #2 hyd, YD#2 pwrd by #3 hyd.

Keep the rest simple, your swimming way too deep. No harm in being familiar with 747 systems but you don't need to know them like your current jet.

I reccommend having a good understanding of
1. aerodynamics (stability, CoG vs CoP, , endurance v range,
2. performance (Vmcg through Mcrit, wet v dry,
3. weather (as relates to SW pacific, jet streams, turbulance,

Everything you can find on Cathay Pacific (what is the name of the airplane in the courtyard? hint; it's not Betsy)

Good Luck,
Another Mil driver
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Old 31st May 2008, 18:34   #4 (permalink)
 
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Those were questions from my 1st interview. Just wanting to get them straight before the 2nd.
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Old 9th June 2008, 23:17   #5 (permalink)
 
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anybody know the answers?
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Old 10th June 2008, 00:43   #6 (permalink)
 
Join Date: Oct 2003
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milpilot,

the wide chord blade is also lighter for it's size, since it is hollow (2 pieces of titanium sealed at the edges and then inflated like baloons in a mold to make the twisted shape on the RR blades) and therefore weighs less than a solid blade of the same size. though thiknking about this it's more an engineering benefit than operational.

good luck,

n1 vibes
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Old 10th June 2008, 01:45   #7 (permalink)
Fogrunner
 
Join Date: Oct 1999
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Posts: 50
This comes from the RR site.


Quote:
The Rolls-Royce wide-chord fan blade

The hollow, titanium wide-chord fan blade, pioneered by Rolls-Royce and introduced into airline service in the 1980s, set new standards in aerodynamic efficiency and resistance to foreign object damage.

Designed specifically for high-bypass turbofans, the breadth of these blades sets them apart from the narrow and less efficient equivalents of earlier times.

Rolls-Royce wide-chord blades are made at the company's Barnoldswick facility in the north of England which is a centre of excellence for this specialist component.

The wide-chord blade is made from three layers of titanium which are bonded together after being heated to a superplastic state, the metal "sandwich" then being inflated with gas. In earlier versions of wide-chord blades this resulted in a honeycomb centre being formed. More recent developments produced a girder structure at the centre of the blade. In both cases the blades are exceptionally strong, durable and lightweight.

The smallest wide-chord blade (a solid titanium version) is used on the Rolls-Royce Tay. Hollow wide-chord fans are used on the V2500, later versions of the RB211-535 and RB211-524, and on all Trent engines.

The latest design innovation is a scimitar-shaped "swept" blade which will be used in production engines for the first time when the Trent 900 enters service on the Airbus A380 superjumbo in 2007.


Congrats on making it through to the 2nd round.

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Old 11th June 2008, 05:00   #8 (permalink)
MilPilot
 
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thanks guys!!

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