Parker Yahoo Group Archived Messages

ID From Subject Date
100 fishinfireman Re: Prop selection for 2520 DV with single SWS250 1/21/2004 21:20:00

Thanks everybody for the replies. The 5200 rpm and 38 mph I referred
to in my original post is reached with the tabs all the way up and
the motor trimmed out as far as possible. I have been running this
boat since april and I have tried a couple of different props but
can't seem to beat the performance of the original prop. My Yamaha
service manual says the motor should be in the top half of the full
throttle rpm range which is 4500-5500 rpm. I'm within the top half of
the range at 5200 rpm but I would prefer to be at the top of the
range. I was hoping that someone here had already found the answer.
Maybe yet.

--- In <a href="/group/parkerboats/post?postID=tSqoCrSiSMeiBPaJsp4VvXz-bf_SDtnNoeL9PNwV-wQY4ZtLwJ7qJUsn0kqMmV_CGGtHHO7YDdLyYZ73B-W6FBJnR0yy_g"></a>, "skopje179" <skopje179@e...>
> Bill,
> How have you trimmed the motor and tabs? If it is trimmed in too
> close to the transom, it forces the bow deeper into the water and
> rpm will fall off.
> Pick a nice calm day--preferably one with a near glass surface--and
> make sure the tabs are fully retracted (up position). Bring her up
> to WOT and trim the motor out until you begin to hear some
> cavitation. Then trim it in until the cavitation goes away. That
> should be your best trim for that boat, motor, prop, and load
> combination. At that trim, the rpms should be in the 5,500-5,700
> range as indicated by another poster.
> Using the method above, I can get my twin F115s up to about 5,700,
> as low as 4,700 (when trimmed all the way into the transom). So
> can have a BIG difference on WOT.
> Skopje
> >
> > Hello all. This is my first post here. I have been running my
> 2520
> > since last april. The prop that came on the boat is the black
> > stainless 17" pitch x 15" diameter. With a moderate load I max
> out at
> > 5200 rpm and 38 mph. I would like to get more rpm without
> > speed. Has anyone here been able to find a prop that performs
> better
> > than the stock prop?
> >
> > Thanks,
> > Bill Blair