[Public-List] A-4 Two blade propeller survey

[Jeffrey Randall]

Hello on a cloudy Sunday,

Also a 13/7 two blade.  I concur on the RPM limits but have reconciled it
with the fact that we are still at 5.5 or better and steady.
I also agree that to really work the boat in small spaces requires a
considerable amount of feathering of both the rpm and F/Reverse gears.
Would a 3 blade change that significantly?

And while the prop walk is considerable, I assume all sailboats similarly
susceptible.  Also, as a frugal sailor I am hesitant to fix what I feel
aint broke, at least for me.

All that said, I consider myself an aggressive but disciplined fair weather
sailor and have not experienced the worst, or even lots of just bad
weather, to test me and the boat.

Jeff Randall
Yankee Star 296



On Sat, Apr 25, 2020 at 8:06 PM Greg Hounsell via Public-List <
public-list at lists.alberg30.org> wrote:

> Afternoon
>
> I have a 13" x 7" prop. It came with the boat and not happy with it at all.
> The Atomic on reaches around 1400rpms and that's it. It also only leaves
> about a 3/4" Gap at the top.
> In Marinas constantly in and out of gear at idle otherwise speed too fast
> and major propwalk in reverse.
>
> It does plow through headwinds and 1-2m waves easily.
>
> Purchased the Indigo 3 blade this winter. Maybe we'll get to try it this
> season??
>
> Cheers
> Greg #592
>
>
> On Sat, Apr 25, 2020, 1:10 PM charles pleisse via Public-List <
> public-list at lists.alberg30.org> wrote:
>
> > If your Alberg 30 has an Atomic 4 with a two blade prop,
> > What diameter is you propeller?
> > What is the pitch is your prop?
> > At what RPM do you achieve hull speed?
> > How content are you  with,
> > forward thrust
> > reverse thrust
> > amount of prop walk
> >
> > Charles Pleisse
> > Sookie #221
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-- 
Sincerely,


Jeff Randall
JCMedical
603-498-5574