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Boeing P-8 Poseidon Neptune Wing Question

PHX787 From Japan, joined Mar 2012, 5102 posts, RR: 14
Posted (10 months 3 days 2 hours ago) and read 5749 times:

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Does this military model of the 738 have RAKED wingtips? What for? Does it do anything to give it a longer range?

sorry if discussed before.
-PHX787

頑張ろう日本!

9 replies: All unread, jump to last

Areopagus From United States of America, joined Sep 2001, 1357 posts, RR: 1
Reply 1, posted (10 months 3 days 2 hours ago) and read 5743 times:

Yes. See "737" Raked Wingtips Better Than Blended Winglets? (by Ikramerica Jun 4 2005 in Tech Ops) .

connies4ever From Canada, joined Feb 2006, 3892 posts, RR: 13
Reply 2, posted (10 months 3 days 2 hours ago) and read 5729 times:

Per Areopagus: yes. Raked wingtips are slightly more efficient than winglets, but for 737-sized aircraft move them from, I believe, Class 3 to Class 4 in terms of apron footprint (> more cost). But the Navy won't have to deal with that.

P-8 is the "Poseidon", not "Neptune".

"Neptune" was the name given to the Lockheed P2V "Neptune" ASW aircraft built mostly for the US Navy.
http://en.wikipedia.org/wiki/Lockheed_P-2_Neptune

Nostalgia isn't what it used to be.

PHX787 From Japan, joined Mar 2012, 5102 posts, RR: 14
Reply 3, posted (10 months 3 days ago) and read 5675 times:

OK i see, thanks for the info.

Mods please change thread title!

頑張ろう日本!

Devilfish From Philippines, joined Jan 2006, 4450 posts, RR: 1
Reply 4, posted (10 months 2 days 19 hours ago) and read 5587 times:

The P-8 is actually designated as the P-8i Neptune in Indian Navy service.....

http://www.flightglobal.com/news/art...-eight-northrop-mq-4c-bams-370233/

Quote:
"BAMS would be particularly useful for India because it is optimised to operate in conjunction with the Boeing P-8A Poseidon, of which India has ordered eight examples designated as the P-8I Neptune."

.....and differs from the US version by having a 360 degree belly search radar, and a Magnetic Anomaly Detector at the tailend.

http://1.bp.blogspot.com/-YQVL4ICHWPg/UAU8b-meCkI/AAAAAAAAQqo/ECEZIwLs9NU/s1600/P-8I%2B%25232%2Bfirst%2Bflight%2B%25282%2529-730661.jpg

http://1.bp.blogspot.com/-YQVL4ICHWP...%2Bflight%2B%25282%2529-730661.jpg

[Edited 2012-08-20 21:22:28]

"Everyone is entitled to my opinion." - Garfield

bikerthai From United States of America, joined Apr 2010, 1628 posts, RR: 4
Reply 5, posted (10 months 2 days 10 hours ago) and read 5480 times:

Quoting connies4ever (Reply 2):
Per Areopagus: yes. Raked wingtips are slightly more efficient than winglets,

Although minor, the rake wingtip does not obstruct the view of the observer as much as the blended winglet. When differences in performances are small, these minor items can tilt you decision one way or the other.

bt

Intelligent seeks knowledge. Enlightened seeks wisdom.

nomadd22 From United States of America, joined Feb 2008, 1577 posts, RR: 0
Reply 6, posted (10 months 2 days 6 hours ago) and read 5408 times:

It surprised me a little. I knew raked tips were more efficient at cruise, but I had the idea the P8 would be spending a lot of time at relatively low speed loiter. I guess getting to and from station is more of a factor. One of the things that makes the P-8 so much more useful than a P-3 in a world with fewer bases.

Andy Goetsch

bikerthai From United States of America, joined Apr 2010, 1628 posts, RR: 4
Reply 7, posted (10 months 2 days 4 hours ago) and read 5359 times:

Quoting nomadd22 (Reply 6):
but I had the idea the P8 would be spending a lot of time at relatively low speed loiter.

With all the sensors involved now-a-day, you can cover more area (because of curvature of the earth) if you are higher up.

Weapons like depth bombs and torpedoes will be evaluated for high altitude drops. Guess the only time when you want to drop down on the deck would be if you want to get an eye ball on something or drop a survival kit to someone in the water.

bt

Intelligent seeks knowledge. Enlightened seeks wisdom.

KC135TopBoom From United States of America, joined Jan 2005, 11742 posts, RR: 51
Reply 8, posted (10 months 2 hours ago) and read 5018 times:

The P-8A/I also uses the B-737-900ER wing, as opposed to the B-737-800 wing, which holds less fuel. There are also hard points on the wings and a bomb bay aft of the wing that commerical B-737s don't have.

ADent From United States of America, joined Dec 2006, 1186 posts, RR: 1
Reply 9, posted (9 months 3 weeks 5 days 5 hours ago) and read 4655 times:

If you look at the link in the second post one of the official reasons for the raked wingtips is ice - the raked tips will be anti-iced and the standard blended winglets are not.

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