[Public-list] Corrections!!

Tue Apr 4 06:59:23 PDT 2006

Mmmmm - hate fast typing and brainless spell checking, bad combination...

What I meant was:

The load is TRANSMITTED not transited.

And the vector is AFT, not forward.

Those corrections make the message below make more sense!

Gord #426

> 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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>> 
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> 
> _______________________________________________
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