Thread subject: Whaler Central - Boston Whaler Boat Information and Photos :: new member jeff lohr's 15' classic restored whaler

Posted by Jeff Lohr on 08/31/16 - 4:50 AM
#11

Thanks all, for the compliments. Angel, I had to table some of the whaler work due to finishing work on a remodel house project, but I have some info for you on performance. Yes it comes on plane well with the trim tucked in, and it cruises at a sweet spot around 28 mph with this setup. The Yamaha 90 runs a pretty tall gear at 2:1, whereas most 70-90 HP 3 cylinders run from 2.33 to 2.5:1. So I'm spinning that prop a little faster than a 70 rude, or Yamaha. Mercury 3 cyl 90 is a bigger heavier block and runs a 2.33 gear so you would have to get a bigger wheel, say around 22 pitch for start. My motor is set so the hook on the top of the transom bracket is 1.5 inches above the transom. I have no tach yet but I measured speed by GPS and timed several runs on an exact quantity of fuel. At 24 mph it gets about 6 mpg and at 28 mph it gets around 5.5 mpg. Once I get tach installed I'll know more. This of course is a 2 stroke engine. I like the setup as the motor weight is virtually identical to the old 70 e-rude, so its static trim, and handling remains the same. But with the extra HP on tap its good for pulling skiers or heavy loads of people. I do drop back to a 13 1/2 x17 prop though. I do really like the laser 11 for most of my use and cruising as it really grips well. I did plug the vents so it runs cleaner at low speeds.