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Old 06 August 2013, 01:54   #1
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Man Overboard warning system

I believe there is a man overboard warning system on the RNLI Atlantic 85, does anybody know how this operates?
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Old 06 August 2013, 07:24   #2
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I believe there is a man overboard warning system on the RNLI Atlantic 85, does anybody know how this operates?
We used to have one in OCR if the crew were one behind the other - we just linked a kill switch up to a light - you can add a horn if required.

No idea how the RNLI do it but it's probably -
  1. More complicated
  2. A lot more expensive
  3. incredibly robust
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Old 06 August 2013, 07:51   #3
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I was involved in an incident last weekend where a crew member broke his ankle in a foot strap after the boat went over a wave and he lost his balance, luckly we heard him scream and stopped sharpish.
He could have so easily gone overboard and we may not have noticed for a few minutes.

This got me thinking of installing some sort of system to warn the helmsmen of a man overboard.

My idea is also to have kill switches at crew seats and each crew member has a kill cord, i have done a quick sketch of what i think the wiring should look like, any advise.
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Old 06 August 2013, 08:17   #4
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Quote:
Originally Posted by bcervelo View Post
I was involved in an incident last weekend where a crew member broke his ankle in a foot strap after the boat went over a wave and he lost his balance, luckly we heard him scream and stopped sharpish.
He could have so easily gone overboard and we may not have noticed for a few minutes.

This got me thinking of installing some sort of system to warn the helmsmen of a man overboard.

My idea is also to have kill switches at crew seats and each crew member has a kill cord, i have done a quick sketch of what i think the wiring should look like, any advise.
Get Yamaha kill switches as they're indestructible and bin the relay they will operate a light without one.
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Old 06 August 2013, 09:22   #5
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We used to have one in OCR if the crew were one behind the other - we just linked a kill switch up to a light - you can add a horn if required.

No idea how the RNLI do it but it's probably -
  1. More complicated
  2. A lot more expensive
  3. incredibly robust
Looks like the RNLI use a kill switch setup as well, notice the lanyard fwd of the comms system.
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Old 06 August 2013, 13:44   #6
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Replace the light with a warning LED. Far less likely to blow.

Do you want the light on or off when the switch is pulled?

Would make sense to use the same KC as your helm what is that?
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Old 06 August 2013, 14:06   #7
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Have I missed something or is the kill switch not exactly what you want. Surely if helm is concentrating enough not to notice MOB, the last thing he /she wants under ( I assume ) extreme conditions is loss of control.
A warning yes, but loss of power? I don't think so. Very confusing and dangerous. Flooding from wake at the stern is just the beginning.
Big warning but not kill.
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Old 06 August 2013, 14:24   #8
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These additional kill switches are just being used such that each crew member has something attached to the boat.

From what I see/understand, they won't cut the engine, they will just cause a warning light/horn/siren/whatever to activate when one of the additional kill cords is pulled.
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Old 06 August 2013, 14:25   #9
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Don't think they are wired into the engine ignition like a normal KC - just using the same switch "technology"...
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Old 06 August 2013, 14:46   #10
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The Atlantic 85 has an additional kill cord at the 4th (back) seat only, wired to a warning light at the helm seat and a loud buzzer. There is no connection from this kill cord to the engines.

Pull the cord, and the light comes on and the buzzer sounds. There is also a mute button to shut the buzzer up so you can hear what you are doing whilst you pick the MOB up.

When the A85 gets its new nav system, pulling the cord will also put an MOB alert on the chart system

Cheers

Chris
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