G'day,
I was in Swanbourne, Perth Western Australia. Am now at 26B
Shearwater Esplanade Runaway Bay Queensland. Doug is still in Perth,
at Maylands boat yard and Rare Bird lives in a canal at Scarborough
just north of Brisbane Queensland. There is also a 15m in Melbourne
which will be launched around Xmas.
regards,
rob
On Wed, Aug 5, 2009 at 1:25 AM, Gardner Pomper<gardner@networknow.
>
>
> Hi,
>
> I have been trying to locate the messages that say where you moved from and
> to. Would you mind posting that in terms that google maps can locate? Also,
> Doug, where are you now? And "Rare Bird"? I would like to tag all these
> things on my map in case I can head down to Australia next year and take the
> "harryproa tour" <grin>
> - Gardner
>
> On Tue, Aug 4, 2009 at 6:36 AM, Rob Denney <harryproa@gmail.
>>
>>
>>
>> G'day,
>>
>> Move was a series of narrowly averted balls ups, same as usual. El
>> will be kept on the jetty (I am looking at various ways of lifting it
>> clear of the water, lifting the ww hull across the jetty and raising
>> the beams up looks easiest) but it will be an interesting exercise
>> getting down the canal against the prevailing breeze. If I can manage
>> it, it will certainly put all the "proas can't shunt in narrow spaces"
>> arguments to bed!
>>
>> No time for harriette at the moment. Got to get the sail on Katy's
>> dinghy (sailing to school is possible and would be a bit different),
>> get el sailing then start on solitarry. Solitarry design has altered
>> somewhat as the pontoon is a bit narrow for full width and a bit short
>> for full length. Will be a good test bed for the ideas for the
>> trailerable version.
>>
>> regards,
>>
>> rob
>>
>> On Tue, Aug 4, 2009 at 2:20 PM, Doug Haines<doha720@yahoo.
>> >
>> >
>> > What was the move like?
>> > Leave the boat at the jetty?
>> > Nice harriette here if interested?
>> >
>> > Doug
>> >
>> > --- On Tue, 4/8/09, Robert <cateran1949@
>> >
>> > From: Robert <cateran1949@
>> > Subject: [harryproa] Re:leeboards
>> > To: harryproa@yahoogrou
>> > Date: Tuesday, 4 August, 2009, 4:16 PM
>> >
>> >
>> >
>> > -If the rudders are supplying a significant proportion of the leeway
>> > prevention, then the loads are fairly high. If the boat is almost
>> > perfectly
>> > balanced with only a small bit of weather helm then the loads are fairly
>> > light. Most boats are somewhere in between, with the rudders themselves
>> > being balanced so you don't notice the work they are doing in leeway
>> > prevention. In very shallow waters there is significant leeway
>> > prevention as
>> > the hull is so long with little rocker, so the water has a hard time
>> > getting
>> > away or being replaced on the ww side. In shallow water waves go slower
>> > as
>> > they drag on the bottom, so the wave it is making as it tries to go
>> > sideways
>> > through the water, build sup and gives more sideways resistance than in
>> > deeper water. I don't think I would go for a keel but possibly a central
>> > rubbing strake with sharp edges, or even rubbingstrakes on the bilges.
>> > It
>> > would not need be much to significantly reduce leeway in shallow water.
>> > Some
>> > people on Jarcats simply use two aluminium channels with the channels
>> > facing
>> > inwards to enable sailing with the centre board up
>> >
>> > -- In harryproa@yahoogrou ps.com.au, Gardner Pomper <gardner@... >
>> > wrote:
>> >>
>> >> This would be a great topic to get clarified, because the rudders are
>> >> an
>> >> area of concern for a number of us, I think.
>> >> I would like to be able to remove the stress from the rudders when
>> >> sailing
>> >> at high speed. If I didn't want shallow draft, I would consider a fixed
>> >> keel. I still might consider a 1' stub keel, maybe 6 feet long, under
>> >> the
>> >> lw
>> >> hull. If I could get a motoring draft of 2', that would be ok. I don't
>> >> expect to sail it hard in really shallow water; I just want to be able
>> >> to
>> >> sail it lightly, which would not depress the lw hull much.
>> >>
>> >> I am pretty sure that Rob has stated that is just an issue of building
>> >> the
>> >> rudders as strong as they need to be, but I would like to better
>> >> understand
>> >> the relationship between the forces required for steering and the
>> >> forces
>> >> required for leeway protection.
>> >>
>> >> - Gardner
>> >>
>> >> On Mon, Aug 3, 2009 at 12:19 PM, jrwells2007 <jrwells2007@ ...>wrote:
>> >>
>> >> >
>> >> >
>> >> > If I remember correctly, a harryproa can be sailed with only the
>> >> > stern
>> >> > over-sized rudder so the usual balancing of the CE and the CLR is not
>> >> > particularly applicable.
>> >> > Rob or someone will correct me but I think that the lack of leeboards
>> >> > or
>> >> > centreplates is to avoid the cost and complication of a third foil.
>> >> > Bear
>> >> > in
>> >> > mind that there is a long hull with considerable lateral resistance.
>> >> >
>> >> >
>> >> > --- In harryproa@yahoogrou ps.com.au <harryproa%40yahoog roups.com.
>> >> > au>,
>> >> > Gardner Pomper <gardner@> wrote:
>> >> > >
>> >> > > Hi,
>> >> > > Ok, I like the explanation, but I am still having problems finding
>> >> > > it.
>> >> > > On
>> >> > a
>> >> > > harryproa, I know that the CE of the sails is aft of the mast,
>> >> > > because
>> >> > > it
>> >> > is
>> >> > > a rotating rig. The center of lateral resistance should be right at
>> >> > > the
>> >> > > mast, since the hulls are symmetrical. So, if I put the leeboard
>> >> > > next
>> >> > > to
>> >> > the
>> >> > > mast, right in the center, that should satisfy.
>> >> > >
>> >> > > So, I am still confused, since that is apparently the wrong answer.
>> >> > > I
>> >> > hate
>> >> > > it when I look in the back of the book for the answer and still
>> >> > > can't
>> >> > work
>> >> > > it out <grin>
>> >> > >
>> >> > > - Gardner
>> >> >
>> >> >
>> >> >
>> >>
>> >
>> >
>> >
>
>
Change settings via the Web (Yahoo! ID required)
Change settings via email: Switch delivery to Daily Digest | Switch format to Traditional
Visit Your Group | Yahoo! Groups Terms of Use | Unsubscribe