Re: Downhaul blocks

["Robert Harper" <rharper@xxxxxxxxxxxx>]

Excelent work as always Bill.

For what its worth, I've found that if I put the downhaul blocks as close  
to the base of the mast, the less pull there is on the bottom of the luff  
track on the main. You do cause a little bagginess in the sock at the  
front of the mast but you don't end up with as much tension pulling the  
track off the mast as you tighten the cunningham. Lightwieght will be  
honking on this so extra purchase here will also be a plus for you.

On Wed, 10 Jan 2007 13:33:07 -0700, <WFS03@xxxxxxx> wrote:

> Dave,
> Regarding the Down-haul Blocks at 75-3/4" on the Deck Layout, I had made  
> the
> backing plate and mounting holes for the old design and then Bram  
> changed them
> to two RF20174 Pivot Lead Blocks, mounted on the aft end of the mast step
> channel.  I may use the old eye-strap and two RF20100's as the control  
> blocks for
> the newly designed forestay adjustment system and install the new
> v-cleats/wedges on the wings, just aft of the righting system thru-hole.
>
> For the new down-haul design, the pivot blocks are bolted to a  
> hybrid/glass
> mounting bracket that is bolted thru the mast step channel.  There is  
> space
> underneath for the cunningham control line to pass forward to the RF662  
> block.
> The mounting bracket raises the control lines above the spin sock.  I  
> made it
> by laying hybrid over a 1"x4" wooden mandrel to make a U-shaped channel  
> long
> enough to fabricate two brackets, with the same hybrid/glass layup used  
> to make
> the mainsheet bracket on the boom.  The U-shaped channel was then  
> half-filled
> with 406 filler and glass-fiber strands to make a solid block for  
> mounting the
> swivel blocks.  The bracket stand was cut down to 2" high, sealed with
> epoxy/graphite and drilled thru for the swivel block mounting holes.   
> Below is a
> shot of the completed installation and the untrimmed spare bracket  
> (standing on
> the sock).
>
> Bill Scheumann
> USA020 and USA040



--
Live large, love lots, and sail fast!
The mark of who you are is determined by what you do when you don't have  
to do it.
USA 050 Fugu
77959 Wasabi
Robert Harper

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