[hpv-boats] human powered yacht?

[Larry H. Smith]

I've always thought Harry Bryan's fin  drive was interesting (aft of  
the stern, as opposed to the Hobie fin-drive amidships).

Harry used a forward skeg, I believe, on a boat designed to use the  
fin, to counteract yawing forces. I'm guessing that a larger/heavier   
boat would yaw less, and that for a given propulsive force, the fin  
drive wouldn't have any greater yaw component than a scull or yuloh  
(?). if not, this set-up would offer a leg-powered centerline   
motivator with trailing kick-up possibilities in the shallows. Also  
multi-operator linkages could allow shared and/or increased power to  
the fin. (are there multi-operator yulohs?)

i've not seen any mention of possible use of Harry's fin on larger  
craft.

Comments?

Larry

On Aug 22, 2010, at 1:34 PM, Sam UK wrote:

> Hi  all
>
> Thanks for all the replies. I made my first yuloh today (the thing  
> Larry was
> using by the sound of it) I will post some photo's tomorrow in case  
> any one
> is interested.
>
> http://www.simplicityboats.com/ScullYulohaboat.htm
>
> I found it pretty effective, It's basically a large single bladed  
> propeller.
> I think I will put the leg pedalling on hold for a while whilst I get  
> used
> to the yuloh.
>
> Thanks
>
> Sam
>
> On Sun, Aug 22, 2010 at 6:20 PM, Larry H. Smith <lhsmith at wvi.com>  
> wrote:
>
>> By way of encouragement re. moving a large boat via human power -
>>
>> I watched Larry Pardey scull "Taleisin", which was 29-feet 6-inches,  
>> with a
>> 10-foot 9-inch beam, and 17,800 lbs. displacement, into a berth at  
>> Port
>> Townsend, Washington, during one of the Wooden Boat Festivals .
>>
>> Slow, but workable, and I didn't get the impression he was working
>> exhaustively.
>>
>> IIRC, he was using a long sweep over a stern quarter without foot  
>> power,
>> but I could be mis-remembering that detail (foot/no foot).
>>
>> Pretty impressive to see, ...but I wouldn't want to try it against any
>> headwind.
>>
>> Larry ( Interesting to see this new burst of activity on what seems  
>> to have
>> become largely a ghost forum!)
>>
>>
>>
>> On Aug 22, 2010, at 4:15 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-systemI
>>> 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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