NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Rolling Cruise Ship
From: P Fay
Date: 2006 Jul 26, 21:32 -0500
Red wrote:
> Very interesting. How did you happen to have a GPS running and with enough sky
> to get bearings?
>
>
> A little very crude photogrammetry:
> The pool appears to be about 15' wide excluding the sit-rims sections. And,
> from the exposed ladder, if I estimate each step to be about 6" apart and three
> to four steps exposed to what had been the fill level in the earlier picture...
>
> I get a right triangle somewhat like this during the splash:
>
> | \.....
> | ..\..........15' pool width
> | \...........
> |---------------------------------*-\- waterline when tilted
> 2' tall
>
>
> So I have a base side of 2' and hypoteneuse at 15'...
>
> Sin* = opposite/hypoteneuse = 2/15= 0.1333
>
> And the angle becomes about 8 degrees if I've done that right.
>
> Admittedly VERY crude and done with a fast eye instead of proper measurements
> from the photos, but at eight degrees that's still only half of the fifteen(?)
> degrees that the cruise line states now. I haven't heard if there was a tilt
> recorder aboard or whether the results of that will be released but the rubrick
> of "it was human error" should have scared the pants off anyone on future
> cruises, since the error appears to be one that is being commonly made and
> therefore all the more likely to be made again.
>
> If anyone wants to print out the photos and try refining that
> measurement...Please do!
> Anyone know the standard separation of pool ladder steps?<G>
Not my gps, but here is the gps link, might be interesting, I wouldn't
know....
http://mysite.verizon.net/don2738/gpsdetailed.html
If it matters in your calculations, the pool had an wider outer level
with about 1 foot of water with a rim around it, you may see it in the
photos on that page.
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From: P Fay
Date: 2006 Jul 26, 21:32 -0500
Red wrote:
> Very interesting. How did you happen to have a GPS running and with enough sky
> to get bearings?
>
>
> A little very crude photogrammetry:
> The pool appears to be about 15' wide excluding the sit-rims sections. And,
> from the exposed ladder, if I estimate each step to be about 6" apart and three
> to four steps exposed to what had been the fill level in the earlier picture...
>
> I get a right triangle somewhat like this during the splash:
>
> | \.....
> | ..\..........15' pool width
> | \...........
> |---------------------------------*-\- waterline when tilted
> 2' tall
>
>
> So I have a base side of 2' and hypoteneuse at 15'...
>
> Sin* = opposite/hypoteneuse = 2/15= 0.1333
>
> And the angle becomes about 8 degrees if I've done that right.
>
> Admittedly VERY crude and done with a fast eye instead of proper measurements
> from the photos, but at eight degrees that's still only half of the fifteen(?)
> degrees that the cruise line states now. I haven't heard if there was a tilt
> recorder aboard or whether the results of that will be released but the rubrick
> of "it was human error" should have scared the pants off anyone on future
> cruises, since the error appears to be one that is being commonly made and
> therefore all the more likely to be made again.
>
> If anyone wants to print out the photos and try refining that
> measurement...Please do!
> Anyone know the standard separation of pool ladder steps?<G>
Not my gps, but here is the gps link, might be interesting, I wouldn't
know....
http://mysite.verizon.net/don2738/gpsdetailed.html
If it matters in your calculations, the pool had an wider outer level
with about 1 foot of water with a rim around it, you may see it in the
photos on that page.
--~--~---------~--~----~------------~-------~--~----~
To post to this group, send email to NavList@fer3.com
To , send email to NavList-@fer3.com
-~----------~----~----~----~------~----~------~--~---