Forums > Sailing General

MOB resque device

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Created by sirgallivant > 9 months ago, 16 Sep 2017
sirgallivant
NSW, 1531 posts
16 Sep 2017 12:28PM
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Would this thing work reliably in a stormy sea?



MorningBird
NSW, 2703 posts
16 Sep 2017 2:55PM
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An MOB sling that removes the requirement to lift the person over the guard rail. It also allows the only other person onboard to stay at the helm. I reckon it would work in a sea. It should be rigged for rapid deployment rather than kept in a container.
However, is it yet another gadget to part a sailor with his money? What are the chances you would need to use it for an MOB who can get into the sling on their own but isn't able to recover onboard via a ladder.

FreeRadical
WA, 855 posts
16 Sep 2017 1:14PM
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Clever idea, but I'd also be worried about fouling the prop with 2 lines dangling from amidship.

Madmouse
429 posts
16 Sep 2017 3:38PM
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I think its really clever. Would it work on a small boat ie trailable with not so much windage?

SandS
VIC, 5904 posts
16 Sep 2017 6:49PM
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good idea !! I prefer the boom option though

JAKE123
QLD, 314 posts
16 Sep 2017 10:53PM
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so you are in rough seas wind is howling and waves breaking and you now have a sea anchor attached to your rigging, potentially a single stay??

seems like an average idea to me?

Madmouse
429 posts
16 Sep 2017 9:17PM
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I imagine in a strong breeze it could be hard to control how fast it activates.
As to the force on the rig that would be equal to the weight of the MOB.

twodogs1969
NSW, 1000 posts
17 Sep 2017 12:25AM
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Select to expand quote
Madmouse said..
I imagine in a strong breeze it could be hard to control how fast it activates.
As to the force on the rig that would be equal to the weight of the MOB.


I am not an expert on physics but it would have to be more force than the weight of the mob. It would be the resistance of the sea anchor as it is more than the weight of the mob to be able to lift the mob.
I think good in calm conditions when you don't really need it and to dangerous in bad conditions. Easier and safer to use a halyard.

Trek
NSW, 1195 posts
17 Sep 2017 10:02AM
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What happens in the doldrums?

sirgallivant
NSW, 1531 posts
18 Sep 2017 3:07PM
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Yeah, l have my doubts hence the post.

Madmouse
429 posts
18 Sep 2017 2:31PM
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Select to expand quote
twodogs1969 said..


Madmouse said..
I imagine in a strong breeze it could be hard to control how fast it activates.
As to the force on the rig that would be equal to the weight of the MOB.




I am not an expert on physics but it would have to be more force than the weight of the mob. It would be the resistance of the sea anchor as it is more than the weight of the mob to be able to lift the mob.
I think good in calm conditions when you don't really need it and to dangerous in bad conditions. Easier and safer to use a halyard.



Given the sea anchor is connected to the load. I.e the MOB. The resistance of the sea anchor is limited to the weight of the MOB. Looks lije a 1 to 1 set up too so no purchase blocks.

Give or take friction and what happens once the person is aboard and the rope reaches the end of its travel....

sirgallivant
NSW, 1531 posts
19 Sep 2017 8:26PM
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Yeah, there are a few questions asked here which could be valid.

Running over the line, one must be a real goose.

If the mob is too fat or unfit, he does not belong there in the first place.

On a short handed boat using a halyard and helming would be a big ask.

At the end of the rescue, back aboard again, the mob should be ready with his line cutter to slash the line and dispose of the sea anchor if necessary.

An mob exercise using this tool would be a must!

It is an interesting concept.

Would it work? Is MB right?

shaggybaxter
QLD, 2662 posts
20 Sep 2017 11:49AM
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I like this idea.
Hmm..in dirty weather. Aside from what's been mentioned, the lack of mechanical advantage means If your boat goes for a bit of a surf on a wave, the poor old MoB get dragged through the water at the same speed. Can't see the sea anchor moving much.
It's better than having the boat disappearing over the horizon though!

sirgallivant
NSW, 1531 posts
21 Sep 2017 9:08PM
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It is 480 quids, that makes it $820 plus postage.

Hmm.....


.

MorningBird
NSW, 2703 posts
21 Sep 2017 11:21PM
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Select to expand quote
sirgallivant said..
It is 480 quids, that makes it $820 plus postage.

Hmm.....


.


My point. Is it just another gadget to take your cash off you. Even if it does work what is the probability you will need/use its capabilities above a normal MOB sling.
If the MOB is able to retrieve and get into the strop they can climb a ladder, maybe with a helping hand. If the MOB is unconscious it is useless.

sirgallivant
NSW, 1531 posts
22 Sep 2017 10:22PM
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To me it's value is zilch as mostly l sail solo.

It is an interesting device, nevertheless...

Chris 249
NSW, 3531 posts
23 Sep 2017 7:49AM
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One thing that worries me is that there seems to be no way of controlling the power going into the retrieval line. Imagine if the boat was thrown by a wave (or just making leeway) about the time the MOB got near the topsides; they'd be dragged up the side, past the rails etc at lightspeed. It would be worse if the boat happened to turn around; the MOB could be dragged under the hull via the rudder.

If you've got a line to the MOB, a controlled hoist via a halyard seems to be a much better option.

sirgallivant
NSW, 1531 posts
23 Sep 2017 7:15PM
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Yes, but if you are short handed?
Two of you on the boat?

Not everyone is sailing with a big crew. If so, there are options but if not...?...

I am only digging your brains, l am only "philosophising" on this theme.
The basic premise is - of course - that all on board know what they are doing. There is no place for novices there.



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"MOB resque device" started by sirgallivant