[Public-list] Boarding ladders & engine lifting

[Don Campbell]

Since an A4 weighs about 350 lbs, you are putting tremendous strain on the boom,
regardless of how you support it with halyards close to the lifting moment. As
well, you are really changing the forces at the top of the mast with the
increased angles of force and lift, so again possibly overdoing things there,
especially if you still have rivets in the masthead. Then there is the concept
of extra forces on the gooseneck and end of boom and the consideration of rivets
in the boom end caps.
    From what I have seen and done, which includes lifting the A4 motor in #528
three times  for transmission troubles, it is not something you ever want to
have  slip, drop or let fall. I use a 1/2 ton chain falls suspended across 6
rafters of my shed with a 40 lb(/sq. ft.) snow load in the design. I then lift
it from the chain falls to the ground with a 3/4 ton hydraulic crane from my
tractor. I have also helped with removal of a Perkins 4-108 from an Alberg 37
and that was a $100 lift each time with a boom truck. It is by far the safest to
spend some $ for the proper lifting devices for both lifting and replacing
because you really want things under control going in and out so it does not hit
the boat. This means very slow lifts and let downs without the possibility of
uncontrolled swinging, the latter of which the boom would allow.
Don #528

David Parkes wrote:

> Changing the topic slightly, would it be possible to use the technique
> described below (the boom and sheet can be transformed into a lifting
> derrick) to lift the Atomic 4 engine out of the cabin and land it over the
> side?
> David Parkes
> Sapphira #417
> ----- Original Message -----
> From: "Gordon Laco" <mainstay at csolve.net>
> To: "Alberg 30 Public List -- open to all" <public-list at alberg30.org>
> Sent: Wednesday, March 29, 2006 9:43 AM
> Subject: Re: [Public-list] Boarding ladders
>
> >
> > Interesting points -
> >
> > Personally I would never try to pick up a MOB with a ladder in rough seas.
> > As Dan says, the plunging action of the boat would transform any firmly
> > mounted device into a weapon.  Similarly, a temporarily mounted ladder is
> > both highly unlikely to remain in place and also nearly impossible to
> > mount
> > if the boat is moving.
> >
> > Our rescue drill counts the stern mounted ladder as a card to play only in
> > flat water.  In a seaway our plan is to heave to to weather of the rescuee
> > and make the pick up amidships or toward the cockpit. Either way we have a
> > Life Sling ready to bring the person alongside.   I have had to do this
> > once
> > (without Life Sling, but was successful so it has become one of my
> > favourite
> > funny stories; I call it the Mermaid Story; you have to come aboard
> > Surprise
> > to hear it).
> >
> > We have our mainsheet landed on the traveller with a large snap shackle so
> > that at a moments notice the boom and sheet can be transformed into a
> > lifting derrick.   We practice as a family once a year (only once because
> > I
> > think we are good at it)
> >
> > Really hope never to use it but wouldn't it be horrible to have somebody
> > in
> > the oggin and be trying things out for the first time?
> >
> > Gord #426 Surprise
> >
> >
> >
> >
> >
> >
> >
> >> Re: Boarding ladders
> >> Hello A-30 people,
> >>
> >> There's an article in a recent practical Sailor magazine about MOB
> >> rescue maneuvers, and they also compare boarding ladders for rescue
> >> effectiveness. As I recall, windward, as it were, metal legs and pegs
> >> could be spears, transom platforms and steps in a seaway were "hammers"
> >> and flexible ones without weights were useless on curvey hulls...
> >> (Liffeslings still get the top rating, and they integrate a harness.)
> >> The steel and plastic ladder I have is a pain at best.
> >>
> >> How about something removable with hardware? Maybe hang the ladder on
> >> the toe rail with bent sheet metal, padding and pins (fore mid and aft
> >> locations), and clip it to the lifelines for a backup? If the rails can
> >> take the load, it's a cheaper alternative to adding any structure to
> >> support a ladder aft, just be careful with it far aft. Different metal
> >> piece for aft rail. Anyway, might work, or not, but no time for a
> >> project right now...
> >>
> >> --Dan S.
> >> Watcher of the Skies #201, 1966, Cayuga Lake, Ithaca, NY
> >> dans at stmktg.com
> >>
> >>
> >>
> >>
> >>
> >>
> >>
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