PHX787
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Boeing P-8 Poseidon Neptune Wing Question

Mon Aug 20, 2012 9:15 pm

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Photo © Timo Breidenstein



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.
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Areopagus
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Boeing P-8 Poseidon Neptune Wing Question

Mon Aug 20, 2012 9:24 pm

Yes. See "737" Raked Wingtips Better Than Blended Winglets? (by Ikramerica Jun 4 2005 in Tech Ops) .
 
connies4ever
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Boeing P-8 Poseidon Neptune Wing Question

Mon Aug 20, 2012 9:40 pm

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
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PHX787
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Boeing P-8 Poseidon Neptune Wing Question

Mon Aug 20, 2012 11:22 pm

OK i see, thanks for the info.

Mods please change thread title!
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Devilfish
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Boeing P-8 Poseidon Neptune Wing Question

Tue Aug 21, 2012 4:14 am

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]
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bikerthai
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RE: Boeing P-8 Poseidon Neptune Wing Question

Tue Aug 21, 2012 1:17 pm

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
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nomadd22
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RE: Boeing P-8 Poseidon Neptune Wing Question

Tue Aug 21, 2012 4:51 pm

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.
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bikerthai
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RE: Boeing P-8 Poseidon Neptune Wing Question

Tue Aug 21, 2012 6:59 pm

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.

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kc135topboom
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RE: Boeing P-8 Poseidon Neptune Wing Question

Thu Aug 23, 2012 9:29 pm

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.
 
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ADent
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RE: Boeing P-8 Poseidon Neptune Wing Question

Mon Aug 27, 2012 6:06 pm

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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