Real rescue with 26X

[Ixneigh]

How about a come along secured about three feet from the mast base?
These items are economical to buy and increase pulling power substantially.
Ix

[Ixneigh]

Oh yea here's a device that may also help.

Pole with a co2 inflated float at The end.

This consists of 10 foot pole with a deflated float at the end. This float is like a square air matress about six feet on a side. Its like those cheap air mattresses people buy to take to the seashore. The other end of this pole has the triggering device. Inside the pole itself is a length of thin line, but strong like dyneema.

Operation
On approaching the person in the water the float end of the pole is thrust under the victim and the trigger is activated. The float inflates just like one of those fancy life vests does. It lifts the victim out of the water. The float detaches from the end of the pole but the line inside the pole is still tied to the float. (Maybe the deflated float and c02 cartridge are held onto the pole with Velcro)
Now the person is out of the freezing water and you have a line attached. The person can be towed slowly to shore or perhaps be more easily brought onboard.
Ix

[Tomfoolery]

Uh-oh - here come the sketches. I think better with sketches.

The M mast dimensional info is in the Suppliers Corner on the Mac web site, including moments of inertia in the two primary directions. Based on the geometry as scaled off the published marketing stuff, there is about 7 ft of mast cantilevered above the upper shrouds and forestay. The boom is 10-1/2 ft long, also per the Mac web site.

So, hanging a 100 lb weight off the end of the boom, which in turn is swung over the side to 90 degrees (I know, the shrouds would prevent that, but it's the worst-case scenario for mast bending), puts 108 lb tension into the topping lift (ignoring boom weight), resulting in 39 lb perpendicular load into the top of the mast and 100 lb compressive load (negligible). With 84" moment arm, you get fb=39lb(84in)(1.5in)/1.32in^4 = 3700 lb/in^2 or 3.7ksi bending stress in the mast where the shrouds connect, per 100 lb load on the end of the boom. You can scale that up for a hefty lad/lass, and multiply by an impact factor for dynamics. [1.32in^4 is the weak axis moment of inertia from the Mac drawing, and 1.5in is half the width of the mast, also from the Mac sketch].

Yield stress on that 6061 T6 mast material (also per the Mac site) is 40 ksi, so a 300 lb man, with a 2:1 impact factor, still only puts about 22 ksi max bending stress into the mast, which is a little more than half its yield strength.



Of course, the boat will heel, but that only makes the loading a little less since the boom isn't bending the line of action.



Swinging the boom over the cockpit will stand the boat up taller, and put progressively more bending moment into the mast in the fore/aft plane as the bending side-to-side is reduced, but the mast is about twice as stiff and 1.4 times as strong in the fore/aft direction, so no worries. Side-to-side is the worst case scenario.

But it may not actually be worth the trouble to use the boom. Using the main halyard, draped over the side behind the spreaders, will allow the boat to stand taller with a load on it, and won't put much bending into the mast at all. It will take some effort to swing the person back toward the cockpit, but getting him/her out of the water I would think is the first priority, and with 25 ft of drift (load to sheave at the top of the mast), it will take relatively little force to pull him/her back. Or tie him/her to the lifeline. Or remove or slacken the lifeline to get them over the side.

And he/she won't get smacked by the boom. But without the boom there is not the same control with the main sheet to haul it inboard. But the main halyard is there, and so is a winch if it's brought back to the cabin roof. And even without a winch, the halyard can serve as a backstop only if the person is being hauled in by hand.



So in the end, if someone went in and needed help getting out, I wouldn't sweat the mast strength. It has plenty, even side-to-side. I'd worry more about getting them out of the water as quick as possible, which leaves a little time to think about getting them fully into the boat.

And I'd be calling mayday the whole time.

[Highlander]

Tom so r u sayin using the main halyard behind the spreaders & then using the top of the mainsheet detached from the boom & then attached to the main halyard & on a an left attached to the traveller ?
the mainsheet would keep the Mob & main halyard close to the boat thus preventing the possibility of a knock down if the boat were to heel as if the mob should float off too far to s/b or port

Once mob is safely brought to side of boat with one of these ladders attached to a stanchion & genny track cleat bring mob on top of ladder face down hook bottom of ladder & then attach top of mainsheet to bottom of ladder then proceed to lift bottom of ladder with mainsheet while mob is cradled face down , could b used in this scenario
https://cdn.shopify.com/s/files/1/0710/ ... 1426289617
What yer think ?

J

[Tomfoolery]

Tom so r u sayin using the main halyard behind the spreaders & then using the top of the mainsheet detached from the boom & then attached to the main halyard & on a an left attached to the traveller ?
the mainsheet would keep the Mob & main halyard close to the boat thus preventing the possibility of a knock down if the boat were to heel as if the mob should float off too far to s/b or port

I didn't actually say that, John, but I was thinking it.

I think it would be important to get a line onto a person, and the main halyard would allow lifting a person with winch power if necessary, though getting a sling, harness, or other such attachment onto a person in the water likely won't be easy unless they're already wearing a pfd with ring, or conditions aren't rough and he/she is conscious and can help.

And I'm sure it's far, far more difficult than the best laid plans make it seem, unfortunately.

Best to make every effort to prevent a MOB situation in the first place, and to wear a pfd. I use my auto-inflatable whenever I leave the cockpit, especially alone (and half the time, in the cockpit when alone), and never leave the cockpit, other than to go below to grab a water or something, with the boat under sail or engine power. I don't want it sailing or motoring away from me if I fall overboard.