[Public-list] Boarding ladders & engine lifting

Tue Apr 4 06:43:39 PDT 2006

I would agree with Mike -

If the halyard is attached at the same point on the boom as the engine
lifting tackle - the load is transited nicely to the masthead casting where
it is borne as compression (the slight forward vector being opposed by the
forestay).  The rig is immensely strong in compression.   In this structure
the boom is loaded mainly in compression as well, which it and the gooseneck
withstand well.

Set it up carefully, then stand back and think about it before lifting!  I
would judge the weak component would be the halyard and its shackle.

Gord #426

> David,
> 
> That's how we've been removing engines from the Alberg for a long time. You
> can use the boom to lift the engine and swing it over the side. You should
> attach a halyard to the boom at the same point as you attach the come-a-long
> so you do not bend the boom in halh. The attachement point is right over the
> main companionway and you can lower the come-a-long right down to the engine
> a pick it up that way. It will want to swing forward a bit to clear the
> bridge deck.
> 
> 
> 
> Mike Lehman
> ~~~_/)_/)~~_/)~~~
> 
> 
> 
> 
> ----Original Message Follows----
> From: "David Parkes" <davidparkes at ns.aliantzinc.ca>
> Reply-To: Alberg 30 Public List -- open to all <public-list at alberg30.org>
> To: "Alberg 30 Public List -- open to all" <public-list at alberg30.org>
> Subject: [Public-list] Boarding ladders & engine lifting
> Date: Mon, 3 Apr 2006 20:30:38 -0300
> 
> 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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>> 
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