Center of Gravity
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Center of Gravity
I'm trying to find out how to check the center of gravity on a stepped bottom boat, most specific a multi-stepped hull??? Please help, Thanks
#3
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How specific do you want to get? To find the exact point you would need some type of a three axis machine. I don't know that one exists. In aircrafts I think you have pitch, yawl,and roll.
You can determine the center forward and back with jack stands or slings. The others are harder to measure. The way a boat is rigged can help lower the cg. Staggered engines help to lower it. Adding ballast can move it. I hope this is of some use to you.
Jim
You can determine the center forward and back with jack stands or slings. The others are harder to measure. The way a boat is rigged can help lower the cg. Staggered engines help to lower it. Adding ballast can move it. I hope this is of some use to you.
Jim
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I'd make sure the trailer is still attached to the truck, and make sure the boat is still tied to the trailer at the bow and transom, with a foot or so of slack for lifting away from the trailer, (think using some ratchet straps, but leave them about 12" slack). This will alleviate any potential for the boat to slip out of the single sling, fore or aft; off of the trailer.
On a few boats, this may be true, but this is not a rule.
Last edited by Sydwayz; 09-11-2007 at 07:07 AM.
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If you can get your trailer on a trucker's weigh scale empty and tell me the load on the wheels and at the tongue, and then repeat that with the boat on it, I can do the math. Other than that, I don't know.
#7
Weigh the trailer empty, wheels only then tongue jack only, then repeat the measurement with the boat on the trailer. Measure the distance between the wheels and the tongue jack. Then you can determine where the CG is mathematically, relative to the trailer, then measure out the CG location with the boat on the trailer and you'll know where it is on the boat. Not too tough, you just have to measure carefully.
Might be more accurate if you measure each axle individually, and measure center to center of each axle then front axle to tongue jack. Try to do this with the trailer as level as possible, any angle will screw up the measurement.
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Thanks for the input thus far;
Second part of my question, I would like to check and set the balance on my Cigarette Gladiator TS with side by side engines.
Rule of thumb, where should the balance point be, I've heard at the front step, in between the two steps, center of the boat, or is there no answer and it's all based on ride characteristics?
Also, should center of gravity be measured with the boat at rest or does that really have no bearing and it needs to be set with the boat in motion?
Second part of my question, I would like to check and set the balance on my Cigarette Gladiator TS with side by side engines.
Rule of thumb, where should the balance point be, I've heard at the front step, in between the two steps, center of the boat, or is there no answer and it's all based on ride characteristics?
Also, should center of gravity be measured with the boat at rest or does that really have no bearing and it needs to be set with the boat in motion?