[Public-List] A30 Hull Prismatic Coefficient

[Gordon Laco]

Here’s a bit of direct observation to help you… when we had the factory-installed two blade 13 x 7 on the boat, 1,000 rpm gave us 5knots.


Gordon Laco
Surprise 426
www.gordonlaco.com





> On Jun 28, 2021, at 7:00 PM, David A. Bardsley <davebardsley at eastlink.ca> wrote:
> 
> Gordon,
> 
> Thanks for the pointer.
> 
> I've removed the PO's vetus diesel and am installing a 10kW electric drive with a completely new transmission.  I'm free to pick an arbitrary ratio to maximize (hopefully) the performance of my 2 blade 13-8 prop.
> 
> As you can imagine I'vd been spending a lot of time at Google University and on the vic prop calculator!
> 
> Dave
> 
> Ginseng 574
> 
> 
> On Jun 28, 2021 19:47, Gordon Laco <mainstay at csolve.net> wrote:
> Check out Skene’s Elements of Yacht Design.  There will be information there to allow you to make a good estimate.
> 
> I reckon you already know that if your boat has an Atomic IV, it has direct 1:1 drive.
> 
> 
> Gordon Laco
> 426 Surprise
> www.gordonlaco.com <http://www.gordonlaco.com/>
> 
> 
> 
> 
> 
> On Jun 28, 2021, at 6:44 PM, David A. Bardsley via Public-List <public-list at lists.alberg30.org <mailto:public-list at lists.alberg30.org>> wrote:
> 
>   I'm designing my drive's reduction ratio and the resource at my
>   disposal requires our A30's prismatic coefficient as a part of the drag
>   calculation.
>   Can anyone share a decent figure for our craft?
>   Dave
>   Ginseng 574
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