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Old 27th Mar 2014, 08:42   #8321 (permalink)
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Originally Posted by cawky View Post
Hi , I have read every post on here and I am wondering if there could be a lot of debris still floating about from the hurricane that hit the Philipines not long ago?
The Indonesian archipelago is a 3000 mile barrier from the Malaysian coast to the north of Australia. Such debris would have had to travel counter current through narrow straits, passed Australia, to the Indian Ocean.
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Old 27th Mar 2014, 08:43   #8322 (permalink)
 
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A 37.5 kHz (160.5 dB re 1 μPa) pinger can be detectable 1–2 kilometres (0.62–1.24 mi) from the surface in normal conditions and 4–5 kilometres (2.5–3.1 mi) in good conditions. A 37.5 kHz (180 dB re 1 μPa) transponder pinger can be detected 4–5 kilometres (2.5–3.1 mi) in normal conditions and 6–7 kilometres (3.7–4.3 mi) in good conditions. Transponder 10 kHz (180 dB re 1 μPa) range is 7–9 kilometres (4.3–5.6 mi) in normal conditions and 17–22 kilometres (11–14 mi) in good conditions.

Some posts on this thread contradict the above.
The following link to an early AF447 thread post by auv-ee explains the basic facts of pinger location by someone who knows and has been actively involved in this work.

AF 447 Search to resume

It wont take you long to work out that there is a relatively narrow range either side of the towed path which is dependent on th TPL being positioned around 1600 meters above the seabed profile.

Last edited by mm43; 27th Mar 2014 at 08:59.
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Old 27th Mar 2014, 08:49   #8323 (permalink)
 
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Originally Posted by Neogen View Post
And they do have a copter on board:
Do you know that it actually departed with that on board, there has been many delays getting those operational..
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Old 27th Mar 2014, 08:53   #8324 (permalink)
 
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@Pontius Navigator
I postulated in earlier post that because the Maldives have 2 767's and a 757 that maybe they're not too careful with garbage disposal and that this was an old part chucked away.
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Old 27th Mar 2014, 08:57   #8325 (permalink)
 
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A Thai satellite has picked up 300 items of what appears to be debris about 200 km from the French debris patch. Just so frustrating the weather is bad for the next 24 hours.
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Old 27th Mar 2014, 09:10   #8326 (permalink)
 
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In discussion about that supposed mine or fire bottle in the Maldives, does anyone seriously believe that the authorities would not have looked into the alleged finding by now? If they have and it was significant then does anyone seriously believe that so many governments would still be wasting so much money and resources searching 5000 miles away?
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Old 27th Mar 2014, 09:18   #8327 (permalink)
 
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Quote:
Do you know that it actually departed with that on board, there has been many delays getting those operational..
Yes, it departed Fremantle with that MRH90 on board.
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Old 27th Mar 2014, 09:19   #8328 (permalink)
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Are they looking for a 37 kHz radio signal or audio signal? Big difference. And yes u can still buy crt Cro,s. And LCD oscilloscopes, so are they listening for sound waves in which case u use a transducer or radio waves which travel under water?? To subs at 65 kHz,
As mentioned earlier, a 37kHz radio signal is in the LF range and needs a very large antennae and considerable power to radiate any significant range.

37kHz audio, is in the VHF audio range capable of being detected with a transducer and then displayed on the appropriate equipment.
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Old 27th Mar 2014, 09:45   #8329 (permalink)
 
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Some larger pix here:

Thai satellite spots possible wreckage | Bangkok Post: breakingnews
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Old 27th Mar 2014, 09:53   #8330 (permalink)
 
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its been close to a week now that the australian authorities had said that a few possible aircraft debris been seen on satellite images. since then so many aircrafts and ships been doing rounds of the suspected area and still its so surprising that not even a single piece of debris is visually identified and checked hands on just so to make 100% sure that the aircraft has crashed there.
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Old 27th Mar 2014, 09:56   #8331 (permalink)
 
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Satellites seem to spot whatever you want them to spot. If you want them to find evidence of chemical and nuclear facilities they'll oblige. If you want them to spot dinner plate sizes of aircraft wreckage they'll oblige. Anyone who has a satellite wants to be able to say they have spotted something. At this stage its all one-upmanship. All this manpower searching, nothing found, too many false positives.
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Old 27th Mar 2014, 09:56   #8332 (permalink)
 
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Quote:
BANGKOK (AP) - A Thai satellite has detected about 300 objects floating in the Indian Ocean near the search area for the missing Malaysia Airlines jetliner.

Anond Snidvongs, director of Thailand's space technology development agency, said Thursday the images showed "300 objects of various sizes" in the southern Indian Ocean about 2,700 kilometers (1,675 miles) southwest of Perth.

He says the images were taken by the Thaichote satellite on Monday, took two days to process and were relayed to Malaysian authorities on Wednesday.


Images here. It would be useful to get some background from analysts on the rarity of seeing this type of flotsam on satellite images.

https://twitter.com/RodrigoEBR/statu...495424/photo/1
Without trying to be too negative these images and the French images of yesterday look like ice. I took the picture below over seas to the South of Greenland a couple of years ago; height around 30000ft.

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Old 27th Mar 2014, 10:03   #8333 (permalink)
 
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6 months drift to Australian west coast ?

This is a drift pattern of a buoy. It starts

2013-Aug-01 S 4104' E 08501

and ends

2014-Mar-27 S 3457' E 11012'


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Old 27th Mar 2014, 10:04   #8334 (permalink)
 
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RichardC10

Wouldn't you though assume that these experts viewing the satellite images would be able to tell the difference between ice and a non ice object?
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Old 27th Mar 2014, 10:06   #8335 (permalink)
 
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'South of Greenland' would be about 60 degrees North. The search area is 40 degrees South. I wouldn't expect to see ice at 40 degrees North - would you expect to see it at 40 degrees South?
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Old 27th Mar 2014, 10:09   #8336 (permalink)
 
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Quote:
MFC_Fly

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In discussion about that supposed mine or fire bottle in the Maldives, does anyone seriously believe that the authorities would not have looked into the alleged finding by now? If they have and it was significant then does anyone seriously believe that so many governments would still be wasting so much money and resources searching 5000 miles away?
The" fire bottle " is more likely to be part of a scuba rebreather apparatus. See previous posts!!
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Old 27th Mar 2014, 10:12   #8337 (permalink)
 
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In reply to the post that suggested the debris could be from Yolanda, it doesn't look likely. Most of the debris still around from Yolanda would be bare wood.

Very little is painted in the Philippines, most of the people in the affected areas would spend what little they have on rice and fish rather than paint.

Most of the debris in the pictures looks white.
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Old 27th Mar 2014, 10:43   #8338 (permalink)
 
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Location of Thai debris

Can anyone read the co-ords on these pictures ? I was wondering how close they are to the French debris.
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Old 27th Mar 2014, 10:50   #8339 (permalink)
 
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Unless I'm mistaken, water temperature there is in the mid 50's F, 14 C, so it's probably not ice.
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Old 27th Mar 2014, 10:51   #8340 (permalink)
 
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Data transmission or not from MH370?

1 This very interesting PPRuNe blog has informed us many times that all forms of communications from the missing B777 were shut down at about the time that the aircraft left the airways leading to China.

2 But several PPRuNe posts have also told us that there were hourly pings from the B777 until shortly before the time that it was estimated to have run out of fuel (7 hours or so).

3 This same PPRuNe blog has sometimes told us that the 2 Rolls-Royce Trent engines throughout the flight sent coded performance data back to R-R as this system cannot readily be disabled or was overlooked. (Most comments about R-R maintenance monitoring have been quickly deleted by the Mods. Watch this space!)

PPRuNe blog quote:
Quote:
Using the data from just eight satellite "pings" after the plane's other onboard Acars automatic tracking system went off at 1.07am, the team at Inmarsat was initially able to calculate that it had either headed north towards the Asian land mass or south, towards the emptiest stretches of the India Ocean.
So here are 3 simple questions:

1 What system & antenna aboard MH370 continued to send the pings?

2 What system & antenna aboard MH370 sent the R-R data engine monitoring data?

3 When did these two data streams cease?
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