Having_Fun12
Recruit
- Joined
- Oct 15, 2013
- Messages
- 2
Well new to me, is a 2010.
Hi all, been reading this forum allot and I had a prop questions for a used boat I bought. Before I asked, I collected some numbers. Great forum BTW.
3.0 Mercruser Tahoe Q4 SF, 135 HP, Alum 14.24 x 21 prop.
First, the tach on the dash would vary when no change in engine speed (by ear of course). Sometimes as much as 6 or 700 RPMS. Went and bought a tach at Autozone and connected it to the RPM test wire (that was nice to have). That tach was nice and steady and shows my stock tach was reading high..... then low.... but mostly high. Good deal, I thought she had some more in her! The tachs would match for some time, then the stock tach would wonder off somewhere plus or minus. Anyway, that's a different issue.
Used GPS for speed. Here is what I got.
With a full tank, me, misc boat stuff, fairly smooth lake, and trim full down,
Plane'ed out at ~2500 RPM - 15 MPH.
Went to ~18 MPH after plane and trim adjust. Adjusted up until she started to porpoise then tapped it down and it went smooth. No prob, you do have to baby that button.
at 3000 RPM - ~23-24 MPH
at 3500 RPM - ~30 MPH
At 4000 RPM - Don't know, another boat was coming
at 4800 RPM - ~ 42 MPH, at this point, the tachs matched.
Was pretty much at WOT, might could have squeezed out another 100 RPM with trim and balls.
Wow, I was impressed. After reading some things here and trusting the instrument panel (speed is not good either), I was afraid I would not be pleased with the performance. Was not bad out of the hole, but I'm not looking for much there.
Fishing, pleasure, and speeding around only so this seems like a perfect prop.
May go stainless and keep this as a spare, would I notice?
I might have some tach and speedo questions for you later.
Hi all, been reading this forum allot and I had a prop questions for a used boat I bought. Before I asked, I collected some numbers. Great forum BTW.
3.0 Mercruser Tahoe Q4 SF, 135 HP, Alum 14.24 x 21 prop.
First, the tach on the dash would vary when no change in engine speed (by ear of course). Sometimes as much as 6 or 700 RPMS. Went and bought a tach at Autozone and connected it to the RPM test wire (that was nice to have). That tach was nice and steady and shows my stock tach was reading high..... then low.... but mostly high. Good deal, I thought she had some more in her! The tachs would match for some time, then the stock tach would wonder off somewhere plus or minus. Anyway, that's a different issue.
Used GPS for speed. Here is what I got.
With a full tank, me, misc boat stuff, fairly smooth lake, and trim full down,
Plane'ed out at ~2500 RPM - 15 MPH.
Went to ~18 MPH after plane and trim adjust. Adjusted up until she started to porpoise then tapped it down and it went smooth. No prob, you do have to baby that button.
at 3000 RPM - ~23-24 MPH
at 3500 RPM - ~30 MPH
At 4000 RPM - Don't know, another boat was coming
at 4800 RPM - ~ 42 MPH, at this point, the tachs matched.
Was pretty much at WOT, might could have squeezed out another 100 RPM with trim and balls.
Wow, I was impressed. After reading some things here and trusting the instrument panel (speed is not good either), I was afraid I would not be pleased with the performance. Was not bad out of the hole, but I'm not looking for much there.
Fishing, pleasure, and speeding around only so this seems like a perfect prop.
May go stainless and keep this as a spare, would I notice?
I might have some tach and speedo questions for you later.