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Thread: Sea Trial
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Re: Sea Trial
--- The poster formerly known as Scrod ---
I want to live in Theory, everything works there.
1970 36C375
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Re: Sea Trial
Pascal
Miami, FL
1970 53 MY #325 Cummins 6CTAs
2014 26' gaff rigged sloop
2007 Sandbarhopper 13
12' Westphal Cat boat
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06-11-2022 05:57 PM #13
Re: Sea Trial
Is it actually okay to just throw it up to WOT instantly instead of walking the sticks up at a measured pace? I don't know one way or the other, aside from that I got yelled at for doing that once as a kid when driving my dad's boat. The explanation was that there's a lot more force involved going to full throttle instantly than increasing the throttles at a measured pace and it could break the shaft or couplings. The ti's in my boat put out something like 1500lb/ft+ of torque at 1500rpm, I'm sure bigger engines like the 12's in rsmith's boat or C32's in Pascal's are even higher. Isn't that a lot to put into the shafts and props all at one time?
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Re: Sea Trial
Nobody is suggesting a neutral drop.
But if going from forward idle to WOT is going to break the boat, I wouldn't buy that boat.--- The poster formerly known as Scrod ---
I want to live in Theory, everything works there.
1970 36C375
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Re: Sea Trial
Seriously, don't you think the engineers that spec'd the shafts understood the torque loads that the engines could produce?
If they didn't, you don't want that boat.--- The poster formerly known as Scrod ---
I want to live in Theory, everything works there.
1970 36C375
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Re: Sea Trial
Yes pretty much every boat or repower is designed so the shafts can take the load from the engines in normal conditions. I know that when I repowered my 53, the prop shop and the cummins dealer ran the calculations. To ensure the safety factor was adequate
But the question remains why would you want to throw that much torque on the shaft? It s not a maneuver you re ever going to want to do anyway.
Years before I was on another survey sea trial with a heavy handed captain who just pushed the sticks forward. Nothing broke but the boat cavitated and shook for no reason.Pascal
Miami, FL
1970 53 MY #325 Cummins 6CTAs
2014 26' gaff rigged sloop
2007 Sandbarhopper 13
12' Westphal Cat boat
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Re: Sea Trial
On my 34 that has Cummins i throttle up progressively as even though at 270 HP they produce 735 lbs of torque. Why subject it to full throttle from idle. On the 46 I do the same and once the turbos make boost and they take off I am pulling back on the sticks as they build power to reduce unneeded power to get up to speed. Even after pulling back the sticks I end up at higher than desired RPM and pull back down to cruise.
Anyway we can all run as we see fit. But no way would I do this for a surveyor or run long term at wide open throttle. Seems this should all be discussed with seller, buyer, and surveyor before splash and run. If something breaks seller is stuck with the bill. If nothing breaks buyer ends up with a boat that was just run way harder than normal.1966 34c
1982 46 HP
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Re: Sea Trial
I'm not suggesting hard use as routine operation. I agree a half hour at WOT may be excessive, which is why I stated to check the manual.
However, when you're out trolling and one of your less seaworthy passengers loses their balance and falls on the throttles the shafts are going to be subjected to all that torque whether you consider it prudent or not. It has to be able to take it, and it's supposed to be engineered to do so.--- The poster formerly known as Scrod ---
I want to live in Theory, everything works there.
1970 36C375
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Re: Sea Trial
Plenty of people hit stuff and run aground with no drive train failures except bent props. I don’t see a problem with pushing the throttles up in forward. My main gripe is ham fisted people going from forward to reverse without stopping in neutral to let the props spin down. I see a guy with both hands on the clutch levers I just grit my teeth
"DON'T BELIEVE ANYTHING YOU READ OR HEAR AND ONLY HALF OF WHAT YOU SEE" - BEN FRANKLIN
Endless Summer
1967 50c 12/71n DDA 525hp
ex Miss Betsy
owners:
Howard P. Miller 1967-1974
Richard F Hull 1974-1976
Robert J. & R.Scott Smith 1976-present
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