[Alberg30] Atomic4 RPM's

[T. Kevin Blanc]

That's typical, and probably fine, but that's not what
the experts would tell you is right. The engine makes
about %160 percent more horsepower and torque at about
2200 RPM (if I remember the graph right) but it's
tough to get the right prop to do that and still have
some bite at lower RPMs. Cruising Designs has a Atomic
4 variable pitch prop that probably won't work well on
an Alberg (too much dead wood and, perhaps, physical
interference with the rudder when its hard over). A
three blade prop is probably the answer (and will run
smoother to boot), but most folks don't like the idea
of extra drag.

Just about everyone sticks with a two blade 13x7 as
originally supplied. If you don't mind the idea of a
three-blade, Indigo makes one specifically for the A4.
There's a Canadian company called, I think, Campbell,
that makes three blade sailboat props, too.

--- Christos Katehis <kriskate at worldnet.att.net>
wrote:
> Does 1500 rpms sound right on full load?
> In nuetral she goes wild......... Boat does 5-6
> knots @1500 RPM
> 
> Chris
> #383
> 
> 
>
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