[hpv-boats] human powered yacht?

[Bob Stuart]

Sometimes, when becalmed, Mark and I would push his 35' Piver  
Trimaran liveaboard with one of the SpinFin equipped tenders.   
Without changing props, we wouldn't make two knots, but the effort  
was still comfortable.  Boats have the wonderful quality of only  
requiring hard work at higher RPMs, so if you want a workout, you  
have to keep pushing hard.
To maintain the same Froude efficiency at the prop, the swept area  
should be increased to compensate  for the decreased velocity, so  
that the same mass of water passes through the virtual prop disk.

Bob Stuart

On 22-Aug-10, at 5:15 AM, Sam UK wrote:

> Hi All
>
> I have a 22 ft kingfisher yacht http://www.kyoa.org.uk/k20 
> +technical.htm  I
> am interested in powering it partly through human power when I am  
> on  inland
> canals etc.
>
> I will also have a conventional outboard for when I get tired!
>
> I plan to make a Yuloh http://simplicityboats.com/yulohpage2.html  
> which I
> would hope to be able to use for about 2 hours a day. eg
> http://www.youtube.com/watch?v=u7MQsdLpWaM
>
> In addition seems to make sense to use your more powerful  leg  
> muscles to
> power the thing. I realize that the boat will not move fast, and  
> that it
> will be hard work.
>
> The boat has an outboard well inside the boat and I am hoping to be  
> able to
> make use of that to install a pedal system.
>
> 1) Has anyone ever fitted a mirage drive to a boat this big? With what
> results?
>
> 2) I am aware of the escargot
> http://www.mission-base.com/pedal-power/pp_escargot_photos.html are  
> there
> any other large pedal powered boats out there?
>
> 3) I have had a browse on these archives, and have seen people  
> making props
> out of model aeroplane propellers, would the prop need to be longer  
> for such
> a heavy boat?
>
> 4) I am thinking of aiming for this kind of set up
> http://www.openwaterbike.com/components/drive-units/mark-drela- 
> drive-system I
> thought I might start with this cheap gearbox
> http://www.maplin.co.uk/Module.aspx? 
> ModuleNo=43541&C=Froogle&U=43541&T=Module
> and
> upgrade it later if the boat actually moves under pedal power.
>
> Any comments or suggestions?
>
> Thanks
>
> Sam
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