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Posts: 121
Location: Forest Lake, MN & Bemidji, MN | Very unexperienced in this department so hoping for some basic suggestions. I recently got a great deal on a new to me 17ft crestliner pro-am powered by a 1994 mariner 75hsp 2 stroke tiller. Motor runs excellent. When I got it the torque tab was adjusted dramatically to the left and the boat was difficult to turn left when running at high rpm unless it was trimmed up. When trimmed up it was obviously easier, this seems impractical to me but it was how the previous owner handled it. I read in some old threads here that it may be a prop issue, not simply a torque issue.
The prop is a 13" 19 pitch 3 blade aluminum. I realize it will take some tinkering but I figured if someone could tell me a good baseline prop size/pitch upfront it would save time. I don't want to spend a bunch of time trying to get the torque tab thing figured out if I am running the completely wrong prop. Any advice is greatly appreciated. Thanks in advance. Jeremy
Edited by jfreborg 6/3/2013 6:07 PM
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Posts: 3508
Location: Elk River, Minnesota | Hiya,
Quick question of clarification... when you say the torque tab is adjusted to the left, was the rear of the tab to the left or the front of the tab?
Regardless, I would move the tab so it is in line with the prop shaft and test it there for torque. If you feel a bunch of torque while turning left, then turn the rear of the tab just a touch to the left. This should help it turn left and hopefully offset some of the torque you feel. Continue adjusting to your liking.
Do you happen to have a GPS and/or a tachometer on the boat? To get started with a prop change, having a baseline for GPS speed and top speed RPM while trimmed out with your normal load will go a long way to start adjusting.
With the current prop you have, how does the boat perform coming out of the hole if you punch it? Does the bow rise way up and slowly come up to speed or does it pop right up and you are on your way quickly? This can be a small gauge as to whether or not the current prop you have is the right pitch and diameter as well.
Steve | |
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Posts: 121
Location: Forest Lake, MN & Bemidji, MN | Thanks Steve. Rear of the tab was to the left at about a 45 degree angle. The boat obviously wanted to go right. The boat jumped on plane nicely with 3 guys when I did the water test. No steep rise at the bow or sluggish start, just hopped up and went, felt good to me. I was unable to mess with the torque tab during the water test as it started pouring rain. I have straightened it out since getting it home but I won't be able to get on the water again for maybe a week now due to family and work commitments. I am just trying to get as much info as possible before testing it again as I don't want to cut into fishing time to much tinkering with the issue. I thought if someone knew the prop was a bad choice just by seeing the size that it should be the first place I start. I will have more info after the next time out with the tab straight. Thanks again for the advice. | |
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Prop suggestions please 13/19