Subject: Re: [harryproa] Re: flying cruising hulls |
From: Doug Haines |
Date: 1/3/2008, 8:58 PM |
To: harryproa@yahoogroups.com.au |
Reply-to: harryproa@yahoogroups.com.au |
My sense of safety as to weight of ww hull is how much windage there
is under bare poles for the stability of the boat when it starts to
really blow. A large part of the weight of a cruiser is all the junk
carried for cruising. A Harry cruiser unloaded for racing has a good
power to weight ratio and an excellent stability so it should be able
to be moderately competitive as is, but if you are going to extremes
offshore, then I can see Rob's mast shortening coming into its own.
For going under the bridge, maybe you can fly a hull to reduce the
mast height(:<)
Robert
-- In harryproa@yahoogroups.com.au , Doug Haines <doha720@...> wrote:
>
> Hi,
>
> Was wondering where the cut off point is in flying a hull racing
and not flying a hull on a cruiser? How light do you need to keep a
cruiser to be able to match it with racers? Can you do it safely?
> Example boat - Visionarry LW hull, and Harry WW hull.
>
> Doug
>
> Doug Haines <doha720@...> wrote:
> 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@...> 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@...> 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@...> 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@...> wrote:
> > >
> > > G'day,
> > >
> > > You aren't the only one who hopes it works!
> > > .
> > >
> > >
> > >
> > >
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