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Old 14 November 2007, 17:45   #21
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Surley, the bulb and sounder would be better in Parallel.
If used in series should the bulb fail then the buzzer would not sound either.
all IMVHO of course
Quite right - good thinking. will possibly make "speccing" the buzzer and bulb more complex for the novice as will no longer be working at 12V - but the buzzer will still need to work at 12V for the scenario you describe.
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Old 14 November 2007, 17:50   #22
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Quite right - good thinking. will possibly make "speccing" the buzzer and bulb more complex for the novice as will no longer be working at 12V - but the buzzer will still need to work at 12V for the scenario you describe.

No!! both will now be working @ 12v, 2 componets of the same resistance used in series will halve the voltage. :
It's late and you're in a hotel room, been on the red wine have we???
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Old 14 November 2007, 17:57   #23
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No!! both will now be working @ 12v, 2 componets of the same resistance used in series will halve the voltage. :
It's late and you're in a hotel room, been on the red wine have we???
weiss beer!
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Old 14 November 2007, 17:58   #24
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weiss beer!
Say no more
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Old 14 November 2007, 18:30   #25
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Not wishing to take anything away from Niel's posts but dunnae use a wee light or a LED or a wee buzzer, you'll never notice the light or hear the buzzer. A big light right in your line of sight and a piezo siren would do the job.
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Old 14 November 2007, 18:33   #26
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I'm sure I'll be corrected if I'm wrong but the RNLI use a similar system on the new Atlantic 85 where each crew member has a kill cord at each seat position which turns on a light on the console in front of the helm if it becomes detached.
Having each killcord connected to stop the engine would potentially be very dangerous if the the engine were to suddenly stop at anytime when the helm is not expecting it.
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Old 14 November 2007, 18:43   #27
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... but as per my comments above I think it is unlikely to ever be needed. Especially since keeping a good look out in all directions you would soon notice if the other half had disappeared.

Stolen from JF's place.

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Old 14 November 2007, 19:00   #28
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kill cord?

If you were to lose someone in a very heavy sea, having the engine suddendly cut out potentially could cause a serious problem, or result in collision type injuries do to sudden loss of power.
I feel the warning idea much more useable.
Alternatively get 2 scooter wing mirrors on to the wrap round (asssuming you have one ) and you then have a verybasic but immediate sourceof reference to are they all there type question.
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Old 15 November 2007, 02:54   #29
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Not wishing to take anything away from Niel's posts but dunnae use a wee light or a LED or a wee buzzer, you'll never notice the light or hear the buzzer. A big light right in your line of sight and a piezo siren would do the job.
Yes Jeff I would agree with that (even with stinking hangover!). The wiring is the same.

The Led is simply meant as a visual indication that the system is disabled - so I think an LED is OK there - although a bright one that flashes might be better (which is why I put an LED there and a bulb on the other part of the circuit - sorry if that didn't come across).
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Old 15 November 2007, 04:19   #30
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Surely if it's perceived as that much of a risk (when doing your risk assessment) would a seat belt or a clip-on be a better idea?

The reason we don't use a similar system on the daughter craft ribs is that the crew, on reaching a casualty, may need to move rapidly to carry out their work.

Aren't we also back to the wonderful Arthur Ransome philosophy of "if not duffers, won't drown" ? ...
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