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Aurelia
Joined: 21 Aug 2009 Posts: 2331 City/Region: Gig Harbor
State or Province: WA
Photos: Aurelia
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hardee
Joined: 30 Oct 2006 Posts: 12633 City/Region: Sequim
State or Province: WA
C-Dory Year: 2005
C-Dory Model: 22 Cruiser
Vessel Name: Sleepy-C
Photos: SleepyC
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Posted: Wed Nov 18, 2015 11:57 pm Post subject: |
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YES!
Thanks Greg, good reminder. I had heard a bit of this on the news and now it's nice to get more of the story.
Seems like 9 people in a 21 foot boat, with complementary dive gear might be pushing the limit just a bit, maybe.
Harvey
SleepyC
_________________ Though in our sleep we are not conscious of our activity or surroundings, we should not, in our wakefulness, be unconscious of our sleep. |
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garyf
Joined: 01 Sep 2015 Posts: 167 City/Region: Lincoln
State or Province: CA
C-Dory Year: 1991
C-Dory Model: 22 Cruiser
Vessel Name: C-Story
Photos: C-Story
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Posted: Thu Nov 19, 2015 5:02 am Post subject: |
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hardee wrote: | This link does not work anymore, but clicking on "products" will bring up the green lasers. When I first saw these I thought I really liked the idea of having one in a ditch bag. With the recent news coverage of the laser flashings of: aircraft, news helicopters, and even WA state ferries, we obviously know they can attract attention >>=====> Will it land us in a bad place? |
No... for a couple of reasons. The lasers made by this company are specifically designed to be signalers - they fan out over distance, and therefore are not concentrated enough beyond a few feet to pose a hazard to anyone. This fanned out beam also makes it significantly easier to "paint" a target that you're trying to signal. It would be very difficult to get someone's attention with a regular laser pointer while bobbing in the water... you have to be really accurate for them to see it. With the fanned out beam, you've got a broad brush to sweep across the area of the plane, helicopter, etc.
And... the Federal law that makes it illegal to point a laser at a plane, etc has a provision that allows for signaling in emergencies:
18 U.S. Code § 39A - Aiming a laser pointer at an aircraft
(c) Exceptions.—This section does not prohibit aiming a beam of a laser pointer at an aircraft, or the flight path of such an aircraft, by—
(3) by an individual using a laser emergency signaling device to send an emergency distress signal.
BTW... I personally prefer the red models due to battery life. The green model burns through batteries a lot faster. The red models still have plenty of attention-getting ability. The green beam has greater range, but the range of the red should be plenty, I think. Probably the biggest advantage of the green beam is you can see the beam itself in the air (at night) a lot easier than the red beam, and that might help you aim. Aiming with the red beam isn't horribly difficult - but, like anything, you should spend some time getting familiarized with it when you first get it. |
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hardee
Joined: 30 Oct 2006 Posts: 12633 City/Region: Sequim
State or Province: WA
C-Dory Year: 2005
C-Dory Model: 22 Cruiser
Vessel Name: Sleepy-C
Photos: SleepyC
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Posted: Thu Nov 19, 2015 12:28 pm Post subject: |
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Gary, thanks for your post and the info. I tried to use the "links" to get the rest of the quotes, but then discovered you just put them in blue for emphasis I guess.
Would you mind posting the source link for this:
"18 U.S. Code § 39A "
I would like to explore that some more.
On the colors; my understanding is that the green is "less" liable to be harmful if caught in the eye than the red.
Harvey
SleepyC
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garyf
Joined: 01 Sep 2015 Posts: 167 City/Region: Lincoln
State or Province: CA
C-Dory Year: 1991
C-Dory Model: 22 Cruiser
Vessel Name: C-Story
Photos: C-Story
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Posted: Thu Nov 19, 2015 1:50 pm Post subject: |
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https://www.law.cornell.edu/uscode/text/18/39A
Spectrum-wise, green might be a better color... I'm not sure. I'm guessing your point is that red is closer to infrared? Many green lasers actually emit a significant amount of infrared due to the internal conversion steps they go through to get to the color green.
The green lasers are generally more powerful, though, and I think that'd trump the spectrum point anyway. I have a green laser that can light a match and/or piece of paper. I'm not aware of a commonly available red laser pointer or signaller that can do that. |
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AstoriaDave
Joined: 31 Oct 2005 Posts: 994 City/Region: Astoria
State or Province: OR
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Posted: Thu Nov 19, 2015 4:42 pm Post subject: |
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Got curious about which color laser might be more hazardous to the eye. I suspect, from scanning the link below, that the power of the laser might be the more important consideration. The link definitely contains more than I want to know!
http://www2.lbl.gov/ehs/safety/lasers/bioeffects.shtml _________________ Dave Kruger
Astoria, OR |
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hardee
Joined: 30 Oct 2006 Posts: 12633 City/Region: Sequim
State or Province: WA
C-Dory Year: 2005
C-Dory Model: 22 Cruiser
Vessel Name: Sleepy-C
Photos: SleepyC
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Posted: Fri Nov 20, 2015 12:29 am Post subject: |
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Informative link. Lots of info, sounds like the green might actually be more dangerous than the red given the same power -- has to do with the color filtration, if I understand that right.
With all the sightings by pilots they are getting pretty good at pinpointing the source, which might not be a bad thing if you are drifting around in the ocean someplace.
Harvey
SleepyC
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