Tristan.Jarvis
Recruit
- Joined
- Jun 8, 2012
- Messages
- 3
Hello,
I am trying to find out what would be a great prop to purchase for our boat. We have a stern drive runabout that we use for 90% watersports, if were not towing (wakeboarding, knee boarding, or tubing) we are heading to the dock or have the anchor out and we are swiming. We are comfortable with our cruising speed if needed around 35 to 40 MPH on our small lakes that we utilize. Any faster is not practical if we have the kids or dogs around.
I am currently torn between some type of 4 blade or 5 Blade prop, due to increased non slipage, lift, turning slip properties and ability to hold wakeboarding speeds better. We do ride in smaller resivors that are not that deep. So I am not sure of stainless at this time. I am not sure what a good prop and pitch would be.
Our boat is a 2006 Larson Senza 186. It has a 4.3 GLE Volvo Penta 190 Hp, SX M Transom and SX M1 1.79 outdrive. The prop is a factory 3 Blade Alluminium 14.2 x 23.
Issues that I have noticed is anytime the boat is weighted down we have a hard time getting on a plane. This is significatly worse when we are towing with a lot of heavy passengers. We had 7 adults (Capacity 9 or 1400lbs) on the boat the other day witch translated to about 1200 Lbs + Tower boards Equipment ect. (Roughly 1350- 1400 Lbs) With that weight on board, the boat would pop me right out of the water on the wakeboard (195 lbs) or knee board but would strugle to get on a plane (I/O Trimmed all the way in). Once we were on a plane there was no issues other than having to give it fuel through the turns to stay on a plane at wakeboard speeds. The boat does walk around quite a bit with speed/ throtle control. That should soon be fixed with either ridesteady or perfect pass install.
When we had all the adults in the boat the other day we were riding about 450 Lbs in the bow. We had a significant bow rise issue/ hard to reach a plane. We are currently not looking to invest in tabs for the boat. I like the smart tab concept for some boats, but these will not work for us since the will reduce the wake for wakeboarding and we can not dissengage them manually, in that regard due to our swim platform. If we get the correct prop and still have an issue then I might consider a manual tab (Bennett) if needed to provide lift on the transom to help reach a plane. I would like to simplify driving for my significant other and others, though with out the need for the tabs. Any listing issues would be fixed with moving passengers.
We did some testing of the current prop today. From my research the WOT Max RPMS for this motor should be aprox 4200-4600. Are testing was done with almost glass/ 1' to 2' Rollers in the testing area. Times/ Speeds were from stopwatch and Gps in the boat. Load in boat was most regular gear, tower, 600 Lbs of passengers. Anywhere from this load to the load above (1400 LBS) would be an average load untill I talk my significant other into some type of ballast to increase the wake.
MAX RPMS untill planing 3000
Time to Plane
7.4, 7.8, 8.3, 7.8, 7.9, 7.6
WOT RPMS/ TOP SPEED Reached during that Run
4300 46.5
4300 47.4
4300 47
4300 46
43/44 48.3
4600 46.5
We were able on the last run to increase the RPMS but speed decreased with this trim level. It was hard to read the rpms but they were right over 4500-4600. Our test area was some what small on a harshly controlled speed zone lake.
Thank you in advance and we appriciate your help with this prop selection.
I am trying to find out what would be a great prop to purchase for our boat. We have a stern drive runabout that we use for 90% watersports, if were not towing (wakeboarding, knee boarding, or tubing) we are heading to the dock or have the anchor out and we are swiming. We are comfortable with our cruising speed if needed around 35 to 40 MPH on our small lakes that we utilize. Any faster is not practical if we have the kids or dogs around.
I am currently torn between some type of 4 blade or 5 Blade prop, due to increased non slipage, lift, turning slip properties and ability to hold wakeboarding speeds better. We do ride in smaller resivors that are not that deep. So I am not sure of stainless at this time. I am not sure what a good prop and pitch would be.
Our boat is a 2006 Larson Senza 186. It has a 4.3 GLE Volvo Penta 190 Hp, SX M Transom and SX M1 1.79 outdrive. The prop is a factory 3 Blade Alluminium 14.2 x 23.
Issues that I have noticed is anytime the boat is weighted down we have a hard time getting on a plane. This is significatly worse when we are towing with a lot of heavy passengers. We had 7 adults (Capacity 9 or 1400lbs) on the boat the other day witch translated to about 1200 Lbs + Tower boards Equipment ect. (Roughly 1350- 1400 Lbs) With that weight on board, the boat would pop me right out of the water on the wakeboard (195 lbs) or knee board but would strugle to get on a plane (I/O Trimmed all the way in). Once we were on a plane there was no issues other than having to give it fuel through the turns to stay on a plane at wakeboard speeds. The boat does walk around quite a bit with speed/ throtle control. That should soon be fixed with either ridesteady or perfect pass install.
When we had all the adults in the boat the other day we were riding about 450 Lbs in the bow. We had a significant bow rise issue/ hard to reach a plane. We are currently not looking to invest in tabs for the boat. I like the smart tab concept for some boats, but these will not work for us since the will reduce the wake for wakeboarding and we can not dissengage them manually, in that regard due to our swim platform. If we get the correct prop and still have an issue then I might consider a manual tab (Bennett) if needed to provide lift on the transom to help reach a plane. I would like to simplify driving for my significant other and others, though with out the need for the tabs. Any listing issues would be fixed with moving passengers.
We did some testing of the current prop today. From my research the WOT Max RPMS for this motor should be aprox 4200-4600. Are testing was done with almost glass/ 1' to 2' Rollers in the testing area. Times/ Speeds were from stopwatch and Gps in the boat. Load in boat was most regular gear, tower, 600 Lbs of passengers. Anywhere from this load to the load above (1400 LBS) would be an average load untill I talk my significant other into some type of ballast to increase the wake.
MAX RPMS untill planing 3000
Time to Plane
7.4, 7.8, 8.3, 7.8, 7.9, 7.6
WOT RPMS/ TOP SPEED Reached during that Run
4300 46.5
4300 47.4
4300 47
4300 46
43/44 48.3
4600 46.5
We were able on the last run to increase the RPMS but speed decreased with this trim level. It was hard to read the rpms but they were right over 4500-4600. Our test area was some what small on a harshly controlled speed zone lake.
Thank you in advance and we appriciate your help with this prop selection.