Kevin is correct. 16x16 to a 17x10 for the ST-37.
For the ST-74 usually an 18x18.
If there is not enough aperture for a large enough prop, you can go more pitch even if it has to be over square.
Thanks,
Alex
--- In electricboats@yahoogroups.com, Kevin Shepherd <shepherdkevinj@...> wrote:
>
> I use a 16x16 with a st37 5 ton. Wish it was bigger
>
> Kevin Shepherd
>
> On 2011-10-27 8:22 PM, "Eric" <ewdysar@...> wrote:
>
> **
>
>
> Hi Carter,
>
> The general guideline is 1kW of motor for each ton of displacement. You can
> use much less in fair weather but for general safety, the 1 kW per ton is a
> good compromise. With 15kW, you should be able to hit 90-95% of hull speed
> at full throttle.
>
> It's your boat and you can put in whatever you want, but our guidelines come
> from the combined experience of many installations.
>
> I don't know where you sail, but if you're underpowered, you might run into
> problems if you need to motor against a current and a headwind when heading
> into a harbor.
>
> A 12" prop sounds pretty small for a 45 boat, my 30', 5 ton ketch was
> running a 13" prop on the 12hp Yanmar diesel. I went up to 13.5 when I
> switched to electric.
>
> Fair winds,
> Eric
>
> BTW, I think that a $6000 discount seems pretty generous. I wonder what a
> 40hp diesel installation costs...
>
>
>
> --- In electricboats@yahoogroups.com, Carter Quillen <twowheelinguy@>
> wrote:
> >
> > Alex,
> >
> > Th...
> > ________________________________
> > From: A <alecotech@>
>
>
> > To: "electricboats@yahoogroups.com" <electricboats@yahoogroups.com>
> > Sent: Monday, October 24, 2...
> > ________________________________
> > From: Carter Quillen <twowheelinguy@>
>
>
> > To: "electricboats@yahoogroups.com" <electricboats@yahoogroups.com>
> > Sent: Sunday, October 23, 2...
> > ________________________________
> > From: alecotech <alecotech@>
>
>
> > To: electricboats@yahoogroups.com
> > Sent: Thursday, October 20, 2011 1:06 PM
> > Subject: [Electric...
>
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