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That must be due in large part to whatever is requested by the
builder. I believe ABS requires a sub only sustain 1.25 times the
pressure of the requested rating however George appeared to feel
better with a larger safety margin, 2x (+ or -). If you run the
numbers on the K350 for example, you'll see that it theoretically
(by the numbers) survives to 800 feet or so.<br>
<br>
Jon<br>
<br>
<br>
On 10/24/2013 10:38 AM, <a class="moz-txt-link-abbreviated" href="mailto:vbra676539@aol.com">vbra676539@aol.com</a> wrote:<br>
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<blockquote
cite="mid:8D09EDDD759747C-2598-C1FE@webmail-m290.sysops.aol.com"
type="cite"><font color="black" face="Arial, Helvetica,
sans-serif" size="3">
<div><font style="background-color: transparent;">PC-8 has 3/8"
wall thickness on the hull cylinder, the same as the 600,
but was rated 200 feet deeper by ABS, even though it has a
larger radius (21" as opposed to 18"). The ring stiffeners
on the 8 are external and the conning tower larger. Makes
you wonder what the deal is for figuring operating
depth. Perry went to half inch for PS-2 which was the same
boat but rated at 1000'. Hmmm.</font></div>
<div>Vance</div>
</font><br>
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