Received: from opus.hpl.hp.com (opus-fddi.hpl.hp.com) by jr.hpl.hp.com with ESMTP (1.37.109.24/15.5+ECS 3.3+HPL1.1) id AA180328862; Thu, 16 Apr 1998 10:47:42 -0700 Return-Path: <mchapman@cupertino.synopsys.com-DeleteThis> Received: from hplms26.hpl.hp.com by opus.hpl.hp.com with ESMTP (1.37.109.24/15.5+ECS 3.3+HPL1.1) id AA286798861; Thu, 16 Apr 1998 10:47:41 -0700 Received: from tamago.synopsys.com (tamago.synopsys.com [146.225.8.21]) by hplms26.hpl.hp.com (8.8.6/8.8.6 HPLabs Relay) with ESMTP id KAA26054 for <wind_talk@opus.hpl.hp.com-DeleteThis>; Thu, 16 Apr 1998 10:47:40 -0700 (PDT) Received: from marathon.synopsys.com (marathon.synopsys.com [146.225.100.41]) by tamago.synopsys.com (8.8.8/8.8.5) with ESMTP id KAA15040 for <wind_talk@opus.hpl.hp.com-DeleteThis>; Thu, 16 Apr 1998 10:43:16 -0700 (PDT) Received: from cupertino.synopsys.com (cupertino.synopsys.com [146.225.141.202]) by marathon.synopsys.com (8.8.8/8.8.8) with ESMTP id KAA17547 for <wind_talk@opus.hpl.hp.com-DeleteThis>; Thu, 16 Apr 1998 10:44:08 -0700 (PDT) Received: from suntan.chronologic.com (suntan [146.225.141.25]) by cupertino.synopsys.com (SMI-8.6/8.6.9) with SMTP id KAA29599 for <wind_talk@opus.hpl.hp.com-DeleteThis>; Thu, 16 Apr 1998 10:44:07 -0700 Received: by suntan.chronologic.com (4.1/Chronologic) id AA00916; Thu, 16 Apr 98 10:44:07 PDT Date: Thu, 16 Apr 98 10:44:07 PDT Reply-To: <mchapman@Synopsys.COM-DeleteThis> Message-Id: <9804161744.AA00916@suntan.chronologic.com-DeleteThis> From: Matt Chapman <mchapman@cupertino.synopsys.com-DeleteThis> To: wind_talk@opus.hpl.hp.com-DeleteThis Subject: Re[2]: RE: Safety Equip.
I was in a dive shop yesterday and saw a blow-up buoy that divers use
to signal the dive boat when they surface. It's a bright orange tube
about 8 ft long and 5 inches in diameter. If you hold one end of the
tube down in the water (attached to your rig or waist say) it will
stand up vertically.
It's probably too flimsy to be a reliable PFD, but it might work
nicely to float a rig or wave at helicopers or other sailors.
$12 at Wallin's Dive Center in San Carlos. They're behind the REI
store visible from Rt 101.
- Matt
__________________________ Reply Separator _______________________
>
>> I only have common experential engineering experience. I was hoping this idea
>> might stimulate some of those windsurfing engineers out there to calc it out.
>> I think a 12" bouy similar to the ones divers use would do.
>
>Well, okay. Figure 5 pounds each for mast, sail and boom. Assume
>they fill with water and ignore their displacement, so we need
>(pessimistically) 15 pounds flotation. Water is 1 kg/l = .036 lb/in^3
>so we need 416 cubic inches or a sphere 9.3 inches in diameter.
>A ball 12" in diameter has more than double this volume, so it would
>be plenty of flotation.
>
>I would vote for floating the rig rather than the 100' of line, since a
>long line can catch someone's fin when they sail near to see what the buoy is.
>
>The problem would be that finding a 12" buoy, moving with the tide, in
>2-4' swell is really hard, just like finding a windsurfer down in the
>water. But if this is what it takes to get soemone to cast off their
>rig to swim in, then it's well worth it! Put your name and phone number
>on it.
>
>
>Ken Poulton
>poulton@opus.hpl.hp.com-DeleteThis
>
>"hSit happens."
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