[hpv-boats] V15 hull length speed limited ?

[2scott]

Since the hull is wave piercing instead of the other kind,
does it still experience the maximum speeds limited to
hull length like sail boats ?  

--- On Sat, 8/14/10, Rick Willoughby <rickwill at bigpond.net.au> wrote:

> From: Rick Willoughby <rickwill at bigpond.net.au>
> Subject: Re: [hpv-boats] V15 Tested
> To: "HPV Boat" <hpv-boats at bikelist.org>
> Date: Saturday, August 14, 2010, 6:47 AM
> 
> A few questions if you dont mind.
> What is the weight of the boat?  I have not weighed it
> in final form.  The bits totaled just under 20kg. When
> not on it it needed to be pointed into the wind to prevent
> it getting blown away.
> What does the gear box look like up close?  There is
> an image here:
> http://marcopoloboats.com/MitrpakDrive.html
> Although it shows the standard box; not the one with the
> square taper to suit cranks.
> What CAD program did you use to do the 3D modeling? 
> Delftship Pro.  You can get a reasonable free version
> of with no strings attached.  It has slightly less
> functionality than the Pro version.
> What weight driver is the boat optimized for? The boat is
> optimised for a 60kg person but will also perform well with
> a heavier person at high power.It only takes 300W to do
> 15kph with a 70kg rider.  That is about the limit of
> the little gearbox.  You need a larger box if you want
> to use more power.
> Can you show how low in the water the boat is when the
> driver is mounted? This image shows the waterline with total
> of 90kg:
> http://www.rickwill.bigpondhosting.com/V15_5m_Linesplan.png
> Is there any lift or rise out of the water at all while
> underway?  The boat starts bow up at about 7kph with
> net sinkage up to 13kph and then begins to lift.  It is
> not planing but the wave pressure causes it to lift.
> It looks very nice. Thank you - I hope my sister likes it!!
> I am thinking about modifying V14 to use some of these new
> ideas.
> 
> Thanks
> 
> Rick
> 
> 
> 
> 
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