Hi Rick

I'm  hoping to pick your brain about a small hydrofoil aplication.  Since its not harryproa we should maybe take it offline. If you are willing to answer a few questions my email is nickboersema@gmail.com 

Sent from my Bell Samsung device over Canada's largest network.

-------- Original message --------
From: "Rick Willoughby rickwill@bigpond.net.au [harryproa]" <harryproa@yahoogroups.com.au>
Date: 2016-04-29 6:12 PM (GMT-05:00)
To: harryproa@yahoogroups.com.au
Subject: Re: : Re: : Re: : Re: [harryproa] Re:: Campaen's Rudders

 

I have used an uncambered leeboard on one of the pedal boats with  various sails and wings and played around with foil stabilisers on a pedal boat.  

The twin canted boards offer some benefits over a vertical leeboard.  Hinging the dagger board out on the stabiliser and bracing it back to the hull removes the big moments and high stresses.  Shifting the board leeward and canting it enables it to produce a significant righting moment as well.   

There is a reasonably well known sailing hydrofoil that uses twin canted, cambered boards:

https://metrouk2.files.wordpress.com/2013/04/ay108916417national-picture.jpg

I have avoided heavy beams by bracing all the way back to the hull similar to how the board on the 18m proa is braced.  The hydrofoil is more the direction I am aiming for than the Herreshoff although I do not expect the R2AK boat to get airborne:

http://www.sailingtexas.com/Pics4/picherreshoff37102a.jpg

Matt is leaning more toward a short journey rather than a comfortable one.  He has allowed 27kg for provisions and gear.

The canted boards can generate enough lift to at least get the majority of the hull out of the water in sheltered areas but 6m is not much boat to handle seas in open water commensurate with the wind required to get it to fly.  In fact there is considerable added drag from pitching in winds at 12 to 15kts. 

On 29/04/2016, at 7:09 PM, "robriley@rocketmail.com [harryproa]" <harryproa@yahoogroups.com.au> wrote:

ever thought about a leeboard
the sort of thing found on Herreshoff's Meadowlark ketch?