<html><head></head><body><div style="font-family:Helvetica Neue, Helvetica, Arial, sans-serif;font-size:small;"><div><div>Brian,</div></div><div>If you can stop short of the surface and sit and listen, you can hear boats from quite far away. I have experienced this, I actually though a boat was very close to me and I was worried about surfacing. It turned out the boat was very far away.</div><div>Hank</div><div><br></div><div><br></div><div id="yahoo_quoted_1637888324" class="yahoo_quoted"><div style="font-family:'Helvetica Neue', Helvetica, Arial, sans-serif;font-size:13px;color:#26282a;"><div>On Tuesday, July 25, 2017, 8:03:02 PM EDT, Brian Cox via Personal_Submersibles <personal_submersibles@psubs.org> wrote:</div><div><br></div><div><br></div><div><div id="yiv2394639246"><div style="font-family:Arial, sans-serif;font-size:10pt;"><div>Jon,</div><div> That makes sense. I think another calculation that would be helpful would be a jet ski or a power boat traveling at 40 mph at the location of a surfacing sub. At 40 mph you are traveling 58.66 ft/sec, it is generally accepted that a person's reaction time is about 1.5 seconds. If that were the case then once the surfacing sub is noticed at it's critical time in which to react would be approx. 87.99 feet. And that would mean JUST in time to avoid, if it were a boat and maybe somebody's not paying attention it could be a close call indeed . Better to hit a flashing light than cold hard steel ! So the length of your warning pole ( and your rate of surfacing) could buy that annoying jet ski rider a couple of extra seconds to react. </div><div> </div><div>Brian </div><div> </div><div><br><br>--- personal_submersibles@psubs.org wrote:<br><br>From: Jon Wallace via Personal_Submersibles <personal_submersibles@psubs.org><br>To: Personal Submersibles General Discussion <personal_submersibles@psubs.org><br>Subject: Re: [PSUBS-MAILIST] Ethical obligation to inform<br>Date: Tue, 25 Jul 2017 01:07:26 -0400<br><br>
</div><div><br>
Hi Brian,<br>
<br>
It looks to me that Rule 24(g)(i) of USCG Navigation Rules would
apply to submersibles. See
<a rel="nofollow" target="_blank" href="https://www.navcen.uscg.gov/?pageName=navRulesContent">https://www.navcen.uscg.gov/?pageName=navRulesContent</a><br>
<br>
The rule is that the light must be seen from a distance of at
least 3 miles. So height would be determined by line-of-sight
between you and whatever vessel might be around to observe you.
The higher the target vessel observation deck, the lower your
light needs to be. Assuming the target is a kayak with passenger
eyeball height at 3-feet (sitting position), you would need your
light to be one-foot high above the water. Depending upon the
buoyancy of your submarine you may not need a mast at all. See
<a rel="nofollow" target="_blank" href="http://www.calculatoredge.com/electronics/lineofsight.htm">http://www.calculatoredge.com/electronics/lineofsight.htm</a><br>
<br>
Jon<br>
<br>
On 7/23/2017 12:19 PM, Brian Cox via Personal_Submersibles wrote:<br>
</div>
<blockquote>
<div style="font-family:Arial, sans-serif;font-size:10pt;"><br>
<div> </div>
<div>The guy I was talking to said the Coast Guard wanted the
pole 16 feet high ! I think that is a bit much 10 feet would
be about the max I can see, other wise it would be hard to
stabilize . </div>
<div> </div>
</div>
</blockquote>
<br>
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