Who's Online

We have 1337 guests online

Live Traffic Feed

Life in the Skies

'A Local Bestseller!'

What Tony says
(See here)
and Book Launch video here
 
What others say

Les Posen
(See
here)

Yvonne Lee
(See
here)

Louisa Lim & Allan Koay
(See
here)

Aireen Omar, Asran & Bo Lingam
(See
here)

38 Readers' Comments
(See here)

Get an autographed copy here

AMAZON.COM  -  To Order, please Click here 

(eBook) Kindle edition - please Click here

Latest Comment

Does a jet aircraft
There is almost no curvature, because the Earth is

Does an airline capt
I dont think the interview on our side (nautical)

A successful SIA Cad
I am a 3rd year student in Singapore polytechnic.

Cadet Pilots and Pil
captain how to in to the pilot career, becausee i

The twin-engine vers
Dave, in short, it depends on the severity of the

Engine Failure of QA
I heard the Captain of that flight was undergoing

What are the eyesigh
Sir, I am interested to become an airline pilot! T

My Boyfriend is Deat
4 engines plane more safe, remmember passenger pla

Eyesight requirement
HELLO SIR; I have a specks of 1.0 no. so can i eli

Cadet Pilots and Pil
hi capt lim, i want to know that does the cadet pi

Paperback Version

 For Local Availability - Check Here
 
Home > Flying on the Boeing 777 > Some questions relating to winglets and speeds of the Boeing 777.
Some questions relating to winglets and speeds of the Boeing 777.
Flying - Flying on the Boeing 777
Tuesday, 11 December 2007 20:51



Dear Captain Lim,

Thanks for answering my previous questions. I have an interview with Cathay Pacific coming up shortly. So all the help I can get will be appreciated.

On the winglets, approximately how much drag do they reduce in terms of percentage?
What is the difference between maximum range cruise and long range cruise?
What is the relationship of V1, VR and V2?

I really appreciate your time and concern.

Thanks,

Zakk

Hi Zakk,

1. On winglets, they can reduce the drag by as much as 20 % on some wings but you can do further researches on them. I will give you all the links below:-

www.aviationpartnersboeing.com

www.b737.org.uk/winglets.htm

www.visionengineer.com/aero/winglet.shtml

www.airspacemag.com/asm/mag/index/2001/as/htww.html

www.fluent.com/about/news/newsletters/01v10i1/a2.htm

2. Very briefly, maximum range cruise gives the best range in the power setting to achieve the furthest distance with the available fuel you have on board the airplane. It is used when the pilot realized that the airplane is low on fuel. It is based on zero Cost Index.

Long range cruise is the power setting in the Flight Management Computer (FMC) which gives the best cruising speed for long range. It is based on the speed which gives 99 % of maximum fuel mileage at zero wind. This power setting is used to good advantage if you have a favorable tail wind.

3. V1 is the Takeoff Decision Speed used as a reference in deciding whether a take off is to be continued or aborted when an engine failure occurs.  VR or Rotation Speed is the airspeed when the pilot begins to rotate the aircraft to lift off attitude, normally at the rate of 2 to 3 degrees per seconds, depending on the aircraft certification.

V2 is the Takeoff Safety and Initial Climb Speed. This speed is achieved prior to 35 feet above ground level. It is attained as a result of proper rotation and lift off procedures. It allows the aircraft to maintain a specified gradient in the climb-out flight path.

Trackback(0)

TrackBack URI for this entry

Comments (1)

Subscribe to this comment's feed
A330 capt
I think you will find the 20% figure is overly generous. The usual figure is somewhere between 0 and 3%.
Bill , 16 Sep, 2009

Write comment

smaller | bigger

busy
 

Paperback Version

 For Local Availability - Check Here

Recommended By..


LIFE IN THE SKIES

'A Local Bestseller!'

Recommended by

Patrick Smith
Boston USA
(See
here)

Capt Meryl Getline
ex-United Airlines USA
(See
here)

Capt Doug Morris
Canadian Airlines
(See
here)

Capt  Robert J Boser
ex-United Airlines USA
(See
here)

38 Readers' Comments
(See here)

Get an autographed copy here

AMAZON.COM  -  To Order, please Click here 

(eBook) Kindle edition - please Click here

View Book Launch video here

Follow me

@CaptKHLim

Like What You Read?


If you like what you read, more stories are found in my book LIFE IN THE SKIES (Preview here) and you can purchase a copy here. To check for any latest updates or postings, you can follow my Twitter at @CaptKHLim or Facebook here

MH 370 Interviews

Click here to View

10 Most Popular Posts



Disclaimer | Privacy
2004 - 2011 © AskCaptainLim.com | Site Concept by eQuilec.com