Date: Thu, 29 Aug 96 12:07:12 PDT
From: scw@mpl.UCSD.EDU (Spahr Webb)
To: shipsked@ucsd.edu
Subject: Re:  Upcoming New Horizon Cruise

Cruise Plan September 26 New Horizon Leg.

Personnel
Spahr Webb      chief sci.      SIO
Dave Jacobs     sci.            SIO
John Lyons      tech.           SIO
Fred Thwaites   tech.           WHOI    
Bill Shaw       tech.           WHOI 
WHOI may only send one tech, in which case, I will 
probably find another person from SIO to help out.

        We plan to meet the New Horizon at about 8AM
on Sept. 26 in Astoria. We expect to do only minor
loading of gear in a small number of boxes. We hope
to get underway for the Eureka site on the 26th as 
soon as possible.
        We will recover a subsurface array and one
surface mooring with two current meters at a site
near 40-53.35' N, 124-21.35'W. A BASS tripod will be
recovered for the WHOI group.
        The subsurface array will be recovered by
releasing a subsurface float by acoustic command which
will bring a retrieval line to the surface. The subsurface
float has about 1100 lbs of buoyancy (net) and weighs 
about 400 lbs with the releases. The retrieval line is
FLIP mooring line with a breaking strength of over 24000 lbs. 
Should the retrieval line system fail, we are prepared to drag 
for the FLIP line. The retrieval line will be used to pull 
the subsurface array off the bottom.  The subsurface array 
weighs about 1200 lbs, but is a roughly circular structure 
about 60' across. The array will be pulled up vertically 
for recovery using the ship's capstan and a block hung 
on the crane. The array will be brought along side the 
ship and tilted flat across ship's rail. One half of the 
array will be disassembled with the array lying on the rail,
the second half will then be brought on board. We conducted
a similar recovery from the New Horizon last year, the primary
difference is this version is considerably lighter than
the previous version which weighed over 4000 lbs.
        The current meter mooring will then be recovered using the
capstan. This is a standard mooring requiring no special equipment.
Finally, the WHOI tripod will be recovered.
        We have requested that the SIO Port Office look into
whether it would be possible to off load personnel in Eureka
before the ship steams south. The array site is less than 
an hour from the Eureka jetty. If the ship leaves Astoria
mid-day on the 26th, it will arrive off Eureka in late
afternoon on the 27th. We should be done recovering gear by the
morning of the 28th. 

Spahr Webb x41844, scwebb@ucsd.edu