Re: [PSUBS-MAILIST] launch ramp

["Emile van Essen" <AiResearch@hetnet.nl>]

Thank you for your reaction on the launch ramp subject.

Indeed, the ramp at a nice lake in my neigburhood terminates at 0.8 /0.9
meters depth. About the axilary buoancy / pontoon idea: To save the extra
transport weight it could be inflateable like a RIB.
If I decide to design and built a trailerable psub, the winch- method
(eventual with a rolling sled) may be an good option for me.

Emile van Essen


----- Original Message -----
From: "David Buchner" <buchner@wcta.net>
To: <personal_submersibles@psubs.org>
Sent: Tuesday, March 25, 2003 4:59 PM
Subject: Re: [PSUBS-MAILIST] launch ramp


>
> On Monday, Mar 24, 2003, at 13:21 US/Central, John R. Farrington wrote:
>
> > There is a class of sailboat around here, 15-20 feet (5-7m) in length
> > that have a fixed
> > keel extending 3 feet (1m) or so from the bottom of the boat.  There
> > are a number of
> > these around here that are kept on trailers and launched (presumably?)
> > just like a
> > ski boat, which would require the trailer to be really far under water.
>
> I have wondered about that too, but I don't know the answer.
>
> Many ramps around here are VERY short, and likely to result in that
> "getting stuck behind the end of the concrete" problem somebody
> mentioned. I've wondered idly, whether it would be feasible to have a
> whole bunch of auxiliary flotation -- extra outboard saddle tanks, say
> --  that would allow a heavy sub to ride much higher in the water to
> float it off the trailer. Then you float out into deep water, flood
> those tanks, and detach them. You wouldn't need extra air -- you're on
> the surface; just empty them with a fast bilge pump.
>
> In fact, they could be permanently mounted to the *trailer* -- and then
> you could float the whole works out to where it's deep enough, flood
> the trailer tanks to launch the sub, blow the trailer tanks to float it
> back in...? Okay, I haven't thought that one through very much.
>
> ** **
>
> Ah-hem.
>
> Off-topic note:
> For the record, and ironically, the politically provocative quote
> appended to my signature was an embarrassing accident -- resulting from
> a misunderstanding of how my e-mail software handles signatures. (How I
> long for the days when software came with big, thorough manuals written
> by the developers! Now it comes with "Help" files that answer questions
> about things clearly described by their names in the Preferences.) I
> don't see it as that enormous a transgression, but I had intended to
> reserve that part for private mails. My embarrassment stems mostly from
> making myself look like a clueless plebeian.
>
> My apologies to anyone who was overly agitated, and even more apologies
> to our gentlemanly hosts for inciting more list noise.
>
>
> - - -
> David
> buchner@wcta.net
> Osage, MN, USA
>
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