Missing 777

[k0ua]

"It would be well for your government to consider that having your ships and ours, your aircraft and ours, in such proximity... is inherently DANGEROUS. Wars have begun that way"

With apologies to The Hunt for Red October

 

[MossRoad]

Most counties don't have subs.... dump trucks, yes. But subs. No.

 

[texasjohn]

:laughing::laughing::cool2::cool2::drink::drink::stirthepot::duh::duh::reading::reading::biggrin::biggrin::rotfl::rotfl::jump::jump::hyper::hyper:

words matter

 

[buickanddeere]

Great Britain, China, Russia and USA iirc are the four nations officially operating nuclear under water boats.

Lots of opportunity for games with those four players. The Aussies may try to slip a Collins class or two sub into the mix however. They are diesel electric and suffer short under water range. Rather quiet however at slow speeds or when stationary.

 

[Egon]

Hey now eh; we Canadians have very costly submarines. One can always see them at the dock on display. They daren't leave in case they submerge.

The Germans have a pretty quiet sub. With lots of range. It could probably play in the Shark pool with no one being the wiser!

 

[dave1949]

New pings detected. They say they have four within a 17 mile grouping.

 

[buickanddeere]

Iirc the Germans and Dutch are in bed together regarding submarines but I thought they were conventional?

 

[buickanddeere]

With these multiple pings. The pilot, copilot or who ever was messing around with that flight. They must have had a couple of extra pingers and tossed them out the window near the end if the flight .
Either that or somebody later tossed beacons in the ocean after the southern arc was defined.
I hope this isn't much worse with that 777 sitting in Iran or Pakistan.

 

[Egon]

Iirc the Germans and Dutch are in bed together regarding submarines but I thought they were conventional?

Type 212.

 

[MossRoad]

Maybe a whale ate the pinger and that's why its moving.

 

[madmax12]

Maybe a whale ate the pinger and that's why its moving.

Don't whales ping on the same frequency? On their own?

 

[Pixguy]

Don't whales ping on the same frequency? On their own?

Only when they eat cabbage.

I honestly thought this was a joke. Sorry.

 

[MossRoad]

Don't whales ping on the same frequency? On their own?

No. From what I read the manufacturers of the black box pingers specifically chose the frequencies they ping on because no other thing in nature makes sounds on those frequencies (cabbage eating whales may be the exception).

 

[madmax12]

No. From what I read the manufacturers of the black box pingers specifically chose the frequencies they ping on because no other thing in nature makes sounds on those frequencies (cabbage eating whales may be the exception).

Some scientist on npr was just explaining how the whales were having to modify their pings to be able to communicate "over" our pings.

Maybe I have misunderstood.

 

[dmccarty]

Great Britain, China, Russia and USA iirc are the four nations officially operating nuclear under water boats.

Lots of opportunity for games with those four players. The Aussies may try to slip a Collins class or two sub into the mix however. They are diesel electric and suffer short under water range. Rather quiet however at slow speeds or when stationary.

But only the US and the UK regularly send subs on missions. The Russians used too but now it is a big deal when the send a sub to sea and they are lucky the sub does not sink. The Chinese subs are worse than the Russian subs and some do not leave the dock at all though the Chinese are rabidly gaining skills in operations and building. They play for the long game. I doubt any sub leaving Russia or China is not followed by a US sub. That used to be true in the Cold War at least and I would really be surprised if a Chinese sub can leave the First Island Chain with out having a US sub following.

Later,
Dan

 

[madmax12]

http://article.wn.com/view/2014/04/07/Scientists_Search_Crews_Unlikely_to_Confuse_Black_Box_Pings_/

I don't know how accurate this is, but it is being discussed.

 

[Soundguy]

Don't whales ping on the same frequency? On their own?

suposedly the 35khz pinger was chosen because nothing in nature uses it. or at least that's what they say..

 

[k0ua]

I don't think any decent sonar operator would have any trouble distinguishing the pings from a biologic. Fox news showed an actual live screen shot of the waterfall display and it was easy to see the 37.5khz repetitive pattern of 1 second duration pings on 37.5khz. No biologic emits echolocation pings that would be so repetitive. Dolphins may occasionally use this frequency for echolocation but his pings are not going to look like the black box pings on the waterfall. Dolphins can emit pings up to 160 khz. Whales typically use much lower frequency's. For those of you not familiar with looking at a waterfall display, it is an x y display with frequency in the x domain and time in the y domain. I have been looking at PSK31 waterfalls for many years.

 

[madmax12]

That's cool James. Thanks :thumbsup: