1987 15 Sport CC F70: Amazing Results
Posted: Sun Feb 07, 2016 1:43 pm
Hi All. I am not sure if [the "amazing results" are due to] the configuration of this [1987 Boston Whaler Center Console 15] boat. I have the fuel tank under the center console and one battery under the bench seat. This boat runs really fast and surprisingly quite stable. I followed the Yamaha break-in process by running the first hour under 2000-RPM, the second hour on plane around 3500-RPM, and then in hour three to three-and-a-half, I took the boat to wide-open throttle a few times.
For those familiar with the bay area, I launched from Martinez and headed out towards Vallejo under the Carquinez Bridge, then back towards the Benicia Bridge and past Mothball Fleet into Pittsburgh. By the time I got to Pittsburgh the engine already had close to three hours of break-in and approximately 30-miles on the water.
I am currently running a Yamaha aluminum 17-pitch propeller. The [15-footer] jumps on plane instantly, and this is with 12 gallons or full-tank (although tank has sticker stating 18 gallons), my gea,r and one buddy that weighs 140-lbs. I'm at 155-lbs. The engine was able to hit 6300-RPM really fast, against the current (six-foot outgoing), and the boat hit 43.1 [assumed to be miles per hour] with very little trim. The first two full-throttle runs were 41.4 then 42.1 [again, assumed to be MPH] without trim. Since I don't have a GPS receiver and a chartplotter yet--still waiting on release of G07 XSE--the device used was a Garmin etrex 20. So maybe the data I have could be just a little off.
With just a little trim, I can feel the boat accelerate much quicker at the higher-RPM range. I backed off the throttle less than three seconds after a little trim since I am still getting used to this boat.
I think with the combination of the weight in front and the F70 this boat will probably hit 45-MPH or faster, especially if I were to run with the current. I was just looking for a propeller and engine combination that gives it a good [acceleration from a standing start at full throttle] and decent speed, and I could not be any happier with the results.
First time I've seen the boat float in person. The waterline with the F70 is below the two drains.
[NOTE: the thumbnail images below are links to much larger images--jimh]
I put a Yeti cooler in the foredeck for little more added weight, but probably didn't need to.
Spent 9 hours on the water with a little bit of sturgeon fishing.
43.1 mph on aluminum 17" prop.
Thanks to all that has helped me in this process. See you guys on the water!
Simon
For those familiar with the bay area, I launched from Martinez and headed out towards Vallejo under the Carquinez Bridge, then back towards the Benicia Bridge and past Mothball Fleet into Pittsburgh. By the time I got to Pittsburgh the engine already had close to three hours of break-in and approximately 30-miles on the water.
I am currently running a Yamaha aluminum 17-pitch propeller. The [15-footer] jumps on plane instantly, and this is with 12 gallons or full-tank (although tank has sticker stating 18 gallons), my gea,r and one buddy that weighs 140-lbs. I'm at 155-lbs. The engine was able to hit 6300-RPM really fast, against the current (six-foot outgoing), and the boat hit 43.1 [assumed to be miles per hour] with very little trim. The first two full-throttle runs were 41.4 then 42.1 [again, assumed to be MPH] without trim. Since I don't have a GPS receiver and a chartplotter yet--still waiting on release of G07 XSE--the device used was a Garmin etrex 20. So maybe the data I have could be just a little off.
With just a little trim, I can feel the boat accelerate much quicker at the higher-RPM range. I backed off the throttle less than three seconds after a little trim since I am still getting used to this boat.
I think with the combination of the weight in front and the F70 this boat will probably hit 45-MPH or faster, especially if I were to run with the current. I was just looking for a propeller and engine combination that gives it a good [acceleration from a standing start at full throttle] and decent speed, and I could not be any happier with the results.
First time I've seen the boat float in person. The waterline with the F70 is below the two drains.
[NOTE: the thumbnail images below are links to much larger images--jimh]
I put a Yeti cooler in the foredeck for little more added weight, but probably didn't need to.
Spent 9 hours on the water with a little bit of sturgeon fishing.
43.1 mph on aluminum 17" prop.
Thanks to all that has helped me in this process. See you guys on the water!
Simon