Re: [PSUBS-MAILIST] Hull Penetration and Reinforcement

["Smyth, Alec" <Alec.Smyth@compuware.com>]

I believe the K250 wouldn't pass certification as a new design today  
even though it did in the past. Two reasons I'm aware:

- No means to open the hatch from outside
- The land of the forward viewport is too narrow. The viewport does  
have a very substantial ring reinforcing the hole, but the support  
area the acrylic rests on is very narrow.

Neither would the Nektons pass with their drilled viewports.

Both designs obviously are well proven and safe, but I guess they lack  
a few best practices that hadn't been codified at the time.

Alec



On Apr 4, 2010, at 8:24 PM, "Jon Wallace" <jonw@psubs.org> wrote:

> Alan,
>
> I have copies of K250 hull #106 certification by ABS (1970), and  
> K350 by Lloyds Register of Shipping  (1980), that George sent me a  
> number of years ago.  So both designs were certified in their time.   
> I checked the 2010 rules for penetration reinforcement against the  
> 2002 rules and the formulas/text were identical.  I believe Cliff  
> designed the hull calculator spreadsheet from the 2002 rules.   
> According to the spread sheet, Kittredge's hull construction is  
> still more than adequate for the operating limits he advertised them  
> at, including a 2:1 safety margin.  In terms of hull penetrations,  
> the plan specs could be used to run through the various 2010  
> formulas to determine their adequacy given todays rules.
>
> Jon
>
>
>
> Alan James wrote:
> > Hi,
> > I'm wondering wether the K250 / 350 plans meet ABS specifications  
> > as far as hull
> > construction is concerned. I have a diagram of the K250 dome /  
> > hatch construction, wich I'm
> > looking at using as a guidline. Sorry to hear about the calculation  
> > stuff up Frank. I think thats pretty
> > much parr for the course when attempting something new, especially  
> > when you're thinking outside
> > the box like you are, things never seems to go smoothly.
> > Regards Alan
>
>
>
>
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