Hi,

 

You then have a large section at the top, this is adding windage maybe weight.

 

I extended about 50cm to Sidecars two masts and can now sailo under a bridge here at about mid to low tide. The other bridge in the down stream direction is much lower, 5m and would suit a telescoping mast but will leave it up to Rob to sort out first.

 

Doug

Rob Denney <harryproa@gmail.com> wrote:

G'day,
Both pieces of luff are attached with slugs/slides in an integral bolt
rope track.

There is a discontinuity at the join, but should be no problem as the
nearest slides will be a couple of feet above and below it.

The top part of the sail is always on the top mast. The top mast is a
bigger section than the bottom mast, so lowers over it.

regards,

rob

On Jan 2, 2008 11:11 PM, George Kuck <chesapeake410@yahoo.com> wrote:
>
>
>
>
> How is the luff attached to the upper mast so that it can be lowered to the
> bottom mast or is the upper luff free flying ? Is there a slot or track for
> the sail slides to run in and how will it transition from bottom mast to top
> mast ?
>
> George Kuck
> Chestertown, MD
>
> Rob Denney <harryproa@gmail.com> wrote:
>
> G'day,
> >
> > Can the mast be lowered while the sail is powered up under load, when it
> > would be most needed to lower it ?
>
> No, but the on part mainsheet (with 4:1 fine trim) can be eased very
> quicklywhich allows the rig to weathercock, completely depowered.
>
> >What would the procedure be.
> Dump sheet, stroll across the dry, near stationary trampoline, release
> the mast halyard (I will need to come up with some better names for
> the various lines, will ask for suggestions once I know what works),
> which lowers the top mast, with the sail attached and simultaneously
> lowers the bottom part of the sail. Mothe clew and luff downhauls to
> their new attachment points, sheet on and sail away. To drop sail
> completely, do the above,m then trip the halyard l;ock and the top
> part of the sail comes down.
> >
> > Do you have a back up mast or plan for one if the extendable mast should
> > prove not to be practical ? (not that it would be) or would you have to
> > start from scratch ?
>
> As it has to fit in a container, I would make a new top piece with an
> internal sleeve. However, I would put up wth a lot of practical
> problems to have a wing mast which can be reduced in height, weight
> and windage by 50% I cannot any major reasons for it not to work
> (often the way at this stage of the process ;-)) Plenty of potential
> detail problems to solve, but the principle seems sound.
>
> regards,
>
> rob
> >
> > George Kuck
> > Chestsertown, MD
> >
> >
> > Rob Denney <harryproa@gmail.com> wrote:
> >
> > G'day,
> >
> > You aren't the only one who hopes it works!
> > .
> >
> >
> >
> >
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