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Author Topic: Bob Ballard to search for Earhart plane  (Read 65543 times)

Joy Diane Forster

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Re: Bob Ballard to search for Earhart plane
« Reply #120 on: September 11, 2019, 07:26:02 AM »

Matt, Andrew, thanks for the info.  I will continue to keep an eye on the listings.
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Andrew M McKenna

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Re: Bob Ballard to search for Earhart plane
« Reply #121 on: September 12, 2019, 05:32:19 PM »

The Nat Geo Show is now listed to air on Oct 22 at 7:30 pm, presumably EDT.

https://www.nationalgeographic.com.au/tv/expedition-amelia/

Looking at the web address, I wonder if that is in Australia

amck
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Ric Gillespie

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Re: Bob Ballard to search for Earhart plane
« Reply #122 on: September 13, 2019, 08:01:42 AM »

Looking at the web address, I wonder if that is in Australia

Yes, that's Australia.  In the U.S. the show will air at 8pm on Sunday, October 20.
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Christian Stock

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Re: Bob Ballard to search for Earhart plane
« Reply #123 on: September 17, 2019, 10:10:01 AM »

The Nat Geo Show is now listed to air on Oct 22 at 7:30 pm, presumably EDT.

https://www.nationalgeographic.com.au/tv/expedition-amelia/

Looking at the web address, I wonder if that is in Australia

amck

Hopefully he got a second opinion on the aluminum and the other piece.
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Ric Gillespie

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Re: Bob Ballard to search for Earhart plane
« Reply #124 on: September 17, 2019, 10:11:23 AM »

Hopefully he got a second opinion on the aluminum and the other piece.

Hopefully.
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RGWealleans

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Re: Bob Ballard to search for Earhart plane - what about Lagoon?
« Reply #125 on: October 12, 2019, 05:42:57 PM »

Ballard said he did a 100% of the island down to a certain depth and the target area to another depth. But what about the lagoon? Anecdotal evidence of plane parts washing up in the lagoon ("wing" was mentioned by a native) may indicate that the lagoon has some lighter parts of the aircraft hidden beneath the silt. If you believe in the landing wheel and the patch then you have to believe in the possibility that other light aircraft parts made their way into the lagoon. Whether a suitable means of "dragging" the lagoon can be found that the Kiribati government agrees with can be found. Towing divers on boards and looking for  parts after eighty-two years of silt buildup (despite the water in and out) might not be enough. Looking forward to Oct 20th or 22nd & Nat'l Geo special and hopefully some good underwater views of the wreckage from the ship, etc.
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Ric Gillespie

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Re: Bob Ballard to search for Earhart plane
« Reply #126 on: October 13, 2019, 07:27:59 AM »

We did a side-scan sonar survey of the lagoon in 2010.  The lagoon has lots of junk in it but no recognizable airplane debris shapes turned up. It's possible or even likely that some of the hits are airplane debris, but investigating the hundreds of targets is logistically impossible.  As soon as you disturb the silt, visibility goes to zero and there is no way Kiribati would ever permit dragging the lagoon. 
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David Williams

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Re: Bob Ballard to search for Earhart plane
« Reply #127 on: October 13, 2019, 02:18:39 PM »

Rick, dragging of the lagoon would be a laborious and major task and as you say unlikely to be approved by the Kiribati government.  So have you considered another modern, non invasive alternative?  I know you did a sidescan in 2010 but how about Lidar?  Would the underwater (Bathymetric) version of Lidar give a different perspective view to the sidescan and a better chance of identifying those possible aircraft parts you mentioned ?  I understand the Lidar penetration of the silt on the seabed/lagoon floor can be a few cm to 1 metre depending on the operating frequency chosen.

I looked at current Bathymetric Lidar capability (courtesy of google) and it appears there are many options available either to rent or buy.  I have seen a figure as low as $7500 to purchase a Lidar set.  Lidar can be operated from Aerial or Water borne drones, the latter being the better option I think in the Niku case

There are many companies I see on google offering their wares and services and to be clear I have absolutely no connection with the following company but I do think what they offer might be useful to ‘search the lagoon’ in a very short time period next time TIGHAR is on Niku. ;)

Dave Williams

HÉLICÉO Bathymetric Drone with Lidar, Echosounder and Sonar Sidescan Capability, helps in monitoring ports, marinas, sea areas, rivers, creeks, lakes and ponds or lagoons.
 
Precision: Thanks to the different sensor choices we offer (echo sounder, 16 or 32 beams LiDAR, multiparameter probe, SONAR Side Scan), you can acquire mesh data from just a few centimeters up to a meter.

Video Link showing drone in use, in the water of a lagoon:
https://youtu.be/ianN3zbgaFk

Link to company website for comprehensive versatility & capability information: http://www.heliceo.com/en/produits-pour-geometres/superbathy-bathymetric-drone/
Dave W
in the frozen north

 
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Ric Gillespie

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Re: Bob Ballard to search for Earhart plane
« Reply #128 on: October 13, 2019, 04:20:55 PM »

Thanks Dave.  This looks really interesting.  I did not realize there was a bathymetric version of LIDAR that could look through silt.  Using it to search the lagoon at Niku is a possibility, but it might also be the perfect tool for searching the Gull Pond in Newfoundland.  We'll discuss it at the upcoming TIGHAR board meeting.
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Randy Jacobson

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Re: Bob Ballard to search for Earhart plane
« Reply #129 on: October 14, 2019, 06:28:59 AM »

LIDAR depends upon water clarity to probe below the sea surface, and works best in clear waters.  It does not, however, penetrate the sea floor or silty bottoms.  If the water itself contains enough particulate matter, light scattering increases rapidly and the return signal rapidly becomes incoherent and less light returns back to the sensor. 

I was a program manager for the Navy developing various LIDAR systems for mine-hunting purposes.  It is an excellent high resolution system in clear to very clear waters, and works best with a smooth sea surface.  It is a topographic sensor, not one to penetrate the sea floor at all.
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Ric Gillespie

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Re: Bob Ballard to search for Earhart plane
« Reply #130 on: October 14, 2019, 07:37:45 AM »

Thanks Randy.  The clarity of the water in the lagoon seems to vary. Coast Guard veterans remember the water being clear.  We've always found it to be extremely cloudy with silt stirred up from the bottom.  Likewise with the water in the pond in Newfoundland, although there the consistency of the bottom silt is denser - more like oatmeal.
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Bruce Douglas Evans

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Re: Bob Ballard to search for Earhart plane
« Reply #131 on: October 16, 2019, 09:15:52 AM »

Can anyone tell me when and if the programme will be shown in the UK?
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Ric Gillespie

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Re: Bob Ballard to search for Earhart plane
« Reply #132 on: October 16, 2019, 09:17:30 AM »

Can anyone tell me when and if the programme will be shown in the UK?

I'm sure it will be shown in the UK and my best guess is that it will be with a day or two of the American premiere.
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Joy Diane Forster

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Re: Bob Ballard to search for Earhart plane
« Reply #133 on: October 18, 2019, 06:37:10 AM »

You can find the schedule online at the National Geographic UK site.  Looks like it will air October 26.  Here's the link I found:

https://www.nationalgeographic.co.uk/video/tv/expedition-amelia
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