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

Thu Dec 15 07:42:38 PST 2022

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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