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Ian Cassell | 13 Jun 05:52

Open water bike

Giuseppe
               How do your drive legs work? Do you
use gears, chains, belts or whatever. To me the start
point for your open water bike project should be a
reliable drive leg that could be fitted to any type of
boat, the variable would be a range of different 
propellers to suit speed and power.
               I am making a driveleg using an involute
gear box with a 3:1 gearing, the gearbox is angled 
at 45 degrees with two universal joints connecting
to the propeller so the prop spins vertically.
               My boat is a 5 metre monohull with
outriggers, it has a centreboard casing for the driveleg
and hopefully this should work (nearly finished). If
you would like some pics let me know.

Ian Cassell
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Giuseppe Carignani | 13 Jun 09:25

Re: Open water bike

Ian
what you say makes perfect sense to me - I proposed three issues for
the initial discussion on the Open Waterbike, and two of them are
drive unit (or drive leg?) and propeller, (the same you point out)
along with a first idea for sorting them.
Anyway, my idea is that we shouldn't define in the Open Waterbike
architectural model what's INSIDE  the drive unit, but just the
external interfaces (physical connections) and the performance, so my
drive unit and yours could fit an Open Waterbike. This, I believe,
will enable sustainability and innovation.
I have an initial proposal for the connection, shown at:

http://www.openwaterbike.com/architecture/the-architectural-design-group/the-open-waterbike-drive-unit

My drive unit in based an a twisted chain, after some seven
prototypes, we are quite happy with this one, but as I said that's not
so important to me. I will be happy to adopt yours if it's better then
mine: 'our boat is better then mine' is our catchphrase...

I'll hope I can set up a collaborative environment for discussiong and
also uploading files by july; meanwhile I'll be grateful if you send
me your images ane proposals.

Giuseppe

On Fri, Jun 13, 2008 at 5:55 AM, Ian Cassell <iancassell@...> wrote:
> Giuseppe
>               How do your drive legs work? Do you
> use gears, chains, belts or whatever. To me the start
> point for your open water bike project should be a
(Continue reading)

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Larry Smith | 13 Jun 17:55
Favicon

Re: Open water bike

Giuseppe,

Are you familiar with Bob Stuart's "Spinfin" drive unit?

I don't believe Bob is marketing them now, but 
one of those might serve as a solid basis for 
mods to fit your concept.

The Spinfin was/is a sleek dis-mountable unit, 
and I believe it has enough of a track record to 
indicate durability, performance, etc.

Perhaps Bob will comment.

Larry

>Ian
>what you say makes perfect sense to me - I proposed three issues for
>the initial discussion on the Open Waterbike, and two of them are
>drive unit (or drive leg?) and propeller, (the same you point out)
>along with a first idea for sorting them.
>Anyway, my idea is that we shouldn't define in the Open Waterbike
>architectural model what's INSIDE  the drive unit, but just the
>external interfaces (physical connections) and the performance, so my
>drive unit and yours could fit an Open Waterbike. This, I believe,
>will enable sustainability and innovation.
>I have an initial proposal for the connection, shown at:
>
>http://www.openwaterbike.com/architecture/the-architectural-design-group/the-open-waterbike-drive-unit
>
(Continue reading)

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GARZA, VICTOR | 30 Jun 17:59

Whale Power promises more efficient props?

www.thestar.com/article/213475

What do you guys think?

Vic

.
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Giuseppe Carignani | 30 Jun 22:44

Re: Whale Power promises more efficient props?

Hi Vic and colleagues
do you remember the Robo Tuna Project?
It seems that the incredible efficiency of living creatures swimming
depends on their instinctive control of the pressure variations that
allows them to fine-tune their swimming movements increasing the
efficiency:
"Fish encountering vortices senses the pressure variations of the
spinning eddies as they move along its side. To capture energy from
the vortices and boost its swimming efficiency, the fish instinctively
times the flapping of its tail to counter rotating whorls that meet
and weaken the encountered ones."
The shape of the fins doesn't seem the key to me.  But admittedly, I'm
not an expert...
Giuseppe

On Mon, Jun 30, 2008 at 5:59 PM, GARZA, VICTOR <vgarza@...> wrote:
> www.thestar.com/article/213475
>
> What do you guys think?
>
> Vic
>
> .
>
> --
> This message comes to you via the hpv-boats@... mailing list,
sponsored by http://ihpva.org/
> Visit http://bikelist.org/mailman/listinfo/hpv-boats to manage your subscription.
>
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Dave Franzen | 30 Jun 23:06
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Re: Whale Power promises more efficient props?

Giuseppe Carignani wrote:

This phenomena was discovered by Dr. Frank E. Fish (no joke) in the 
1980's and he has been working on it ever since.  Fish is a scientist 
with the Woods Hole center.

http://www.whalepower.com/drupal/?q=node/1

Fish is very interested in how fish/whales/seals/aircraft maneuver.

Regards,

Dave Franzen
Eugene, Oregon

> Hi Vic and colleagues
> do you remember the Robo Tuna Project?
> It seems that the incredible efficiency of living creatures swimming
> depends on their instinctive control of the pressure variations that
> allows them to fine-tune their swimming movements increasing the
> efficiency:
> "Fish encountering vortices senses the pressure variations of the
> spinning eddies as they move along its side. To capture energy from
> the vortices and boost its swimming efficiency, the fish instinctively
> times the flapping of its tail to counter rotating whorls that meet
> and weaken the encountered ones."
> The shape of the fins doesn't seem the key to me.  But admittedly, I'm
> not an expert...
> Giuseppe
>
(Continue reading)

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Rick Willoughby | 1 Jul 01:28

Re: Whale Power promises more efficient props?

www.thestar.com/article/213475

What do you guys think?

Vic

Vic
The article primarily discusses turbines not props.  In low wind  
conditions these must operate at high angle of attack and will  
benefit from the serrated leading edge given the higher tolerance to  
stall.   That is the current target market for the technology.

The most efficient props using high aspect asymmetric foils operate  
with AofA in the range -1 to 1 degree so there would seem to be no  
benefit in using the serrated leading edge for pedal boats.

Rick Willoughby
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GARZA, VICTOR | 1 Jul 07:08

RE: Re: Whale Power promises more efficient props? More FWIW

www.craftacraft.com/whale_fin_poopeller_blades

FWIW.

Vic
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Gmane