Curious to hear what prop and prop pitch size you have once you share it with us.I need to take a look at that. Highest RPM I hit at WOT was 5,500 which sounds like I many not have the correct prop (but i'm no expert so correct me if I'm wrong).
If I drop a couple in pitch, what will that do to my top end speed?Curious to hear what prop and prop pitch size you have once you share it with us.
Once broken in completely, track it at WOT again a few times. Does it stay around 5500 RPM’s on a lower lighter load in smooth water at that time? Not to mention, if you will often run with a little heavier load, then RPM’s will come down further anyways. Hence, I always think its nice to get right near the top of RPM range at WOT on the lighter load. Gives you flexibility for however you’ll use the boat, while getting the performance you paid for.
Your motor can go up to 6000 RPM’s at WOT. So generically you can go down 2 in pitch, and RPM’s should come up about 400…maybe 500 RPM’s and put you where you want to be. That should translate to even better performance manners.
Typically your RPM’s go up about 200 to 250 for each -1 in pitch, or coorspondingly your RPM’s will go down 200-250 RPM’s for each +1 in pitch that you switch to. Numbers vary somewhat based on type of prop and other factors.
I believe these are your specs from Yamaha:
View attachment 32435
Wont really know precisely until you do it. Speed is not as specifically predictable as the RPM part of that equation.If I drop a couple in pitch, what will that do to my top end speed?
Wont really know precisely until you do it. Speed is not as specifically predictable as the RPM part of that equation.
Also, type of prop makes a big deal in that regard: some are designed and cupped for hole shot, or mid-range performance and efficiency, or balanced performance, or top end speed at WOT etc… And 3 or 4 blade makes differences in these regards as well. I am assuming traditional 3 blade props in this discussion.
My armchair guess would be anywhere from 3-6 mph dropping 2 in pitch. It can vary somewhat wildly. Chance it could be more, but those MPH gains are usually small and incremental.
You should gain something in speed, but probalby the biggest reason to dial it in is to run the motor optimally, AND have the most RPM range flexibility when loaded up with people and gear. Plus, for me , I just think if someone is going to pay for a 150HP or MORE HP motor, they might as well dial it in to get what they paid for out of it.
That said, I personally like the speed increases, so that always motivates me.
If I drop a couple in pitch, what will that do to my top end speed?
I feel like I'm good where I'm at. Hole shot is good, top speed is plenty (let's be honest, I won't be hitting WOT with the Mrs in the boat). I'm going to leave it alone.Looks like you have a Yamaha SWS prop?
You're right in the middle of where Yamaha wants you, so no need to change unless you're unhappy with performance. And dropping pitch with another SWS prop will likely not lose much speed as you'll gain RPM up to your rev limiter. Kind of like dropping a gear in your car, at that moment you'll travel as fast as before but just with higher engine RPM. Now if you were well under 5000 RPM and outside peak torque then dropping pitch could pick up speed (partly due to less drag from the larger diameter prop) not to mention make your engine happier.
As you've probably read here a few times switching to an Enertia prop in the same pitch will pick up a few MPH but tradeoff a little holeshot and a little fuel efficiency in your cruising range. Raising the engine will also give you straight-line benefits (speed, fuel efficiency) but potentially cause ventilation in turns or turbulent water.
Everything is clean. Local marina says I’m hitting the right RPMs, assuming I do not have anything mis-aligned. They believe 38 is my top speed.Something isn't right, I hit 38 on my previous 23 ft RCW SA with a 150. Are your toons clean ? You will loose speed if they have slime or build up on them .
You can hit 38 mph with a 150 HP motor on a triton. You have a 300. Your marina is wrong. Very wrong. Wrong to the point I question their competence in this regard since they are off by 8-10 MPH at WOT for your motor and size boat.. You should easily be 46-48 MPH. My boat topped out at 44mph at WOT: 24’ S-series with SPS tritoon hull and 200HP Mercury Verado Pro motor. Your boat is heavier, but you have A LOT more HP and likely a better tritoon hull than me….Everything is clean. Local marina says I’m hitting the right RPMs, assuming I do not have anything mis-aligned. They believe 38 is my top speed.