[hpv-boats] Single person easily driven displacement hulldrivesystems

[v garza]

OOPs, didn't know Rick was there when I posted. Apologies for answering 
someone else's question.

Vic
----- Original Message ----- 
From: "v garza" <vgarza2 at satx.rr.com>
To: "Human Powered Vehicles -- Boats" <hpv-boats at bikelist.org>
Sent: Monday, January 10, 2011 6:26 PM
Subject: Re: [hpv-boats] Single person easily driven displacement 
hulldrivesystems


>
>> What this really shows is that there can be no hard and fast rules as the 
>> prop must be tuned to the application ie the boat.
>> I like you feel that a 4 to 1 gear ratio is about right, bur like Bob 
>> Stuart I also feel that  if the pitch and dia are equal the prop is more 
>> flexible
>> and even though the revs would be higher the efficiency might be better. 
>> To sum it up regardless of the prop design programmes, prop design it 
>> still very trial and error
>>
>> Dennis a
>
> Dennis, I think the statements above are a good summary.  I would approach 
> it by defining the end goal first and consider the motor you have to work 
> with, then work backwards. Prioritize the main goal whether it is 
> sprinting, endurance, draft, weight,  durability, etc. Computer design 
> programs can be helpful but tweaking through dynamic testing can be used 
> for further improvement.  I think
> Rick does that on some level, otherwise why all the different creations? 
> His sister's boat uses a limited range folder and perhaps has other 
> changes compared to his own...
>
> Vic
>
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