[Public-List] [EXTERNAL] boom height for doger

Thu Dec 15 09:23:07 PST 2022

FWIW,  years ago I fixed the gooseneck of the boom to the highest position
on the boom and to adjust luff tension installed a 4 part purchase
cunningham. I never liked having to agjust by sliding the boom up and down.
The boom sits level with the deck.  I get goog performance with this
arrangement.  The boom easily clears the dodger with making any adjustments.

On Thu, Dec 15, 2022, 10:43 AM Gordon Laco via Public-List <
public-list at lists.alberg30.org> wrote:

> Hello Matthew… well it’s pretty tough to get good shape on the main that
> way.
>
> Correct setting involves hoisting the main as high as it will go… the
> gooseneck will rise on the track considerably.  One makes down the halyard
> on it’s cleat, then using the downhaul on the underside of the gooseneck’s
> car, pull the tack of the sail back down to adjust for appropriate tension
> on the luff of the sail.   The gooseneck will come down something short of
> the bottom of the track.
>
> If the gooseneck car can be pulled down to the bottom of the track, then
> either the halyard wasn’t hoisted properly all the way up, or the sail is
> misshapen or too long in the luff.
>
> The cost of not doing this is a poorly setting main.  The manifestations
> of a poorly setting main are more heeling for a given wind speed and less
> forward thrust.   Neither is good.  And more heeling creates a vicious
> circle.
>
> Higher angles of heel result in more weather helm.  A poorly shaped main
> developing more heeling force rather than forward thrust also increases
> weather helm by imbalancing the rig (overpowering aft)   More weather helm
> means slower sailing… Less efficient main means poor windward performance…
> poor windward performance can be life and death if one is in a bad spot.
>
> It’s like having a car whose steering alignment is out of whack all the
> time… much better to tune the bias out and not deal with the problems that
> come with misalignment.
>
> Gord
>
> 426 Surprise
>
>
> Gordon Laco
> www.gordonlaco.com
> 705-527-9612
>
>
>
> > On Dec 15, 2022, at 10:35 AM, Greenhouse, Matthew A. (GSFC-6650) <
> matt.greenhouse at nasa.gov> wrote:
> >
> > Interesting discussion here. From my perspective, when sailing, the boom
> should be at the bottom of the gooseneck track so that the heeling moment
> produced by the main is reduced. The Dodger and Bimini should be designed
> accordingly. At anchor, the boom should be at the top of the gooseneck
> track held there by the stop-slider. This is done just to keep the boom out
> of the way.
> >
> > A tall person might opt to make a different trade decision between the
> healing moment and standing head room under the Bimini and Dodger. I’m 5’5”.
> >
> > Cheers,
> > Matt
> > Friendship 295
> >
> > From: Mike Meinhold <meinhold272 at gmail.com <mailto:meinhold272 at gmail.com>>
>
> > Sent: Thursday, December 15, 2022 10:17 AM
> > To: Alberg 30 Public List -- open to all <public-list at lists.alberg30.org
> <mailto:public-list at lists.alberg30.org>>
> > Cc: Gordon Laco <mainstay at csolve.net <mailto:mainstay at csolve.net>>;
> Greenhouse, Matthew A. (GSFC-6650) <matt.greenhouse at nasa.gov <mailto:
> matt.greenhouse at nasa.gov>>
> > Subject: [EXTERNAL] Re: [Public-List] boom height for doger
> >
> > I always put the topping lift on before lowering the main to keep it off
> the dodger .
> >
> > When hoisting, the main must always be fully up and the gooseneck be
> allowed to rise, so that when fully sheeted down the boom is not on the
> dodger.
> >
> > This depends on the cut of your main .  Mike Lehman had his main cut
> high so he could have a higher dodger.  I mounted his dodger a few inches
> lower on Rinn Duin.
> >
> > As soon as I can I will measure from the top of the slider to the bottom
> of the boom
> > 1) with main stowed
> > 2) with main hoisted
> >
> > And also measure top of slider to top of dodger.
> >
> > If Paul can do the same it would be interesting. To see differences.
> >
> >
> > Mike
> > Rinn Duin #272
> > On Thu, Dec 15, 2022 at 03:46 Gordon Laco via Public-List <
> public-list at lists.alberg30.org <mailto:public-list at lists.alberg30.org>>
> wrote:
> > Yes…. The boom must be in its stowed at rest position
> >
> > G
> >
> > Sent from my iPhone
> >
> > > On Dec 14, 2022, at 9:50 PM, Greenhouse, Matthew A. (GSFC-6650) via
> Public-List <public-list at lists.alberg30.org <mailto:
> public-list at lists.alberg30.org>> wrote:
> > >
> > > Gordon -- Who ever makes this measurement for you, it is important
> that the boom be at the bottom end of the gooseneck track when the
> measurement is made.
> > >
> > > Cheers,
> > > Matt
> > > Friendship 295
> > >
> > > -----Original Message-----
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> > > Today's Topics:
> > >
> > >   1. Clever, but perhaps not so clever... (Gordon Laco)
> > >   2. Re: Clever, but perhaps not so clever... (R Kirk)
> > >   3. Re: Clever, but perhaps not so clever... (Rod Symmes)
> > >   4. Re: Clever, but perhaps not so clever... (Gordon Laco)
> > >   5. Re: Clever, but perhaps not so clever... (Mike Meinhold)
> > >
> > >
> >
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