Doug
I have been around boats for a lifetime. If Rob cares to go up river to the park near the old Sundale site he will see a plaque that gives a bit of my family history. Anyone living near Nerang on the Gold Coast will know the Maid Of Scur. This is the boat I spent my pre-school days on with my father who skippered it.
I sold my last yacht 20 years ago when kids soccer got in the way of sailing. Sailing required time I was short on. I built RC models that were less time consuming to play with but about 10 years ago, post soccer, I decided to go upscale to something that would give me hands on relevant to full scale boats. Hence pedal boats. This was a considered choice and many reasons behind it.
The pedal boats have now become more than a learning exercise. I miss the endorphin rush if I cannot spend at least a few hours a week on the water. I get a giggle at how long it takes the sailing boats to get on the water and often sit going nowhere. I train for and do one race a year; 404km down the Murray. There are a handful of people building to my design and more copying some of the things I am doing. My V7 boat is currently on its way to The Netherlands:
I get lots of requests on odd design challenges like the pedal thrusters on Peccadillo. One example was design of an efficient prop for this electric foiler:
I am an electrical engineer with curiosity about how things work or don't work as intended.
Rick
On 17/05/2011, at 9:14 AM, Doug Haines wrote:
From: Rick Willoughby <rickwill@bigpond.net.au>
Subject: Re: [harryproa] Re: Design your proa
To: harryproa@yahoogroups.com.au
Date: Tuesday, 17 May, 2011, 8:52ToddNo, that is not my goal. My preferred proposal until I see something better is to resist leeway with a centreboard mounted in the lw hull.Using the slab side of a hard chine hull to resist leeway is as effective as using ventilating rudders. Although the rudders are still needed because the CLR will shift about as the hull pitches in waves and sail loads.RickOn 17/05/2011, at 2:51 AM, tsstproa wrote:So your goal is to resist leeway using a square or some what square flat bottom hull!?
I have seen felt and experienced something similar with this 16'L narrow square bottom hull 12'' wide at keel and sheer 24'' deep on 10'' draft, windward demon, crazy!
The video is in the bay. But I did take it out in open ocean just no video. Crazy windward ability with descent speed for what it was. Only needed oar or board down for off the wind work other wise hull only no boards down or oar used above a beam reach.
I lost some of the footage this is what I had left.
http://www.youtube.com/user/tsstproa#p/u/47/Hep6jzWf_Zc
JT my other alias there you go...
Todd
--- In harryproa@yahoogroups.com.au, Rick Willoughby <rickwill@...> wrote:
>
> Rudolf
> There is performance merit in resisting leeway with a non-
> ventillating foil or foils. Once this is achieved it does not matter
> much how the boat is steered unless the rig is poorly balanced. I am
> now thinking dipping rudders a little more sophisticated than what
> Tarawa is using would be my starting point.
>
> The other conclusion is that a slab sided or very deep V (> 45
> degrees) hull will be as effective at resisting leeway as ventilating
> rudders. So a reasonably elegant solution is exactly what Tarawa has
> in concept. It could be engineered with a bit more precision.
>
> Rick
> On 16/05/2011, at 11:16 PM, Rudolf vd Brug wrote:
>
> >
> >
> >
> >
> > Arto,
> >
> > That's exactly what I was wondering:
> > to keep thing as simple as possible could a keel with two small
> > retractable rudders work well?
> > And I mean a keel put onto the same hull you would use having
> > boards, not a deep hull like Tarawa as that would have more wetted
> > area.
> >
> > Can you say anything about that Rick?
> >
> > Rudolf
> > ----- Original Message -----
> > From: Arto Hakkarainen
> > To: harryproa@yahoogroups.com.au
> > Sent: Monday, May 16, 2011 2:04 PM
> > Subject: Re: [harryproa] Re: Design your proa
> >
> >
> >
> >
> > 3) A comment, not a question: what you have said here seems to make
> > sense to the traditional proa lee hull design with almost flat
> > leeside and curved windward side like this Gary Dierking's Tarawa
> > design: http://homepages.paradise.net.nz/garyd/tarawa.html .When
> > working with no foils it must have been the most effective
> > hull form.
> >
> >
> > Arto 0419 104 821
> >
> >
> >
> >
> >
>
> Rick Willoughby
> rickwill@...
> 03 9796 2415
> 0419 104 821
>
Rick Willoughby03 9796 24150419 104 821
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