Parker Yahoo Group Archived Messages

ID From Subject Date
101 Dana Cunniff Re: Re: Prop selection for 2520 DV with single SWS250 1/22/2004 17:32:00

You might be splitting hairs Bill.

Can be how much you carry on boat and how it is stored
in the boat, can be weather conditions too, and how
much fuel is onboard.

I have a slower 2530 and haven't been one to give up
speed to get the tach. to near-redline.

Good luck.

Dana
--- fishinfireman <<a href="/group/parkerboats/post?postID=fhCObFwQg3SU3A6c6gh_wCcjDPhXZ7Z1SDyoWWWy1XQ8P0VrsU3BuWMpMg1Re9a5XZ6PqsHVu5V9Q_MpYUHalFY">fishinfireman@...</a>> wrote:
> 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.
>
> Bill
> --- In <a href="/group/parkerboats/post?postID=2dj2U7nZX_pDsTx67ywGyKaTQ7zlE0tShMgXqzLvtTFivi-SKMrNYTT9tBzSiRlSijobhgv-Q-S0B7RYzn3zLLQ">parkerboats@yahoogroups.com</a>, "skopje179"
> <skopje179@e...>
> wrote:
> > 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
> the
> > 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,
> or
> > as low as 4,700 (when trimmed all the way into the
> transom). So
> trim
> > 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
> losing
> > > speed. Has anyone here been able to find a
> prop that performs
> > better
> > > than the stock prop?
> > >
> > > Thanks,
> > > Bill Blair
>
>


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