The published COG on a Hard top B25 with 165's is 16'5" aft of the bow. My thought to properly distribute the weight of 190 gallons of fuel is to straddle this COG, with one tank aft and one tank forward of it. However, this leaves me with a huge amount of dead space forward. I can use it, but I'm wondering what the negatives of moving both tanks forward of the COG would be. Doing this would give me more room in the engine bay to place batteries with in turn would mean shorter runs to the engines. Any informed opinions???
CMP
Center of gravity and weight distribution, B25...
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Terry Frank
- Senior Member
- Posts: 229
- Joined: Jun 29th, '06, 15:20
- Location: Morehead City, North Carolina
I posted a method for you to calculate the location of the CG for various configurations over on the '25 board. But here I will offer a far more simple and direct method to answer your question.
Run your boat until the tank is near empty. Then get a three or four guys who's total weight is about equal to the total weight of the fuel you want to bunker. Head out with them standing about over the present tanks. The boat should handle as it does now with full fuel.
Then have them move forward to where you think you might like to put the new tanks. See if you like the handling.
More than likely you don't have to actually conduct this experiment. Just ask yourself if you think the boat's handling is going to change dramatically when a three or four passengers move themselves a few feet forward.
A 100 gallon gasoline tank two feet forward of the CG has a moment of 1200 ft-lbs. (gas weighs about 6 lbs per gallon.) A 100 pound teenager standing on the foredeck 12 feet forward of the present CG has the same moment of 1200 ft lbs.
I'll bet your boat would handle just fine with a teenager on the foredeck!
Peter
Run your boat until the tank is near empty. Then get a three or four guys who's total weight is about equal to the total weight of the fuel you want to bunker. Head out with them standing about over the present tanks. The boat should handle as it does now with full fuel.
Then have them move forward to where you think you might like to put the new tanks. See if you like the handling.
More than likely you don't have to actually conduct this experiment. Just ask yourself if you think the boat's handling is going to change dramatically when a three or four passengers move themselves a few feet forward.
A 100 gallon gasoline tank two feet forward of the CG has a moment of 1200 ft-lbs. (gas weighs about 6 lbs per gallon.) A 100 pound teenager standing on the foredeck 12 feet forward of the present CG has the same moment of 1200 ft lbs.
I'll bet your boat would handle just fine with a teenager on the foredeck!
Peter
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Trey Dibrell
- Senior Member
- Posts: 59
- Joined: Jul 5th, '06, 14:13
- Location: Galveston, TX
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kellysmall
- Senior Member
- Posts: 56
- Joined: Jul 3rd, '06, 08:07
- Location: Pensacola, FL
Judge,
The page was inaccessible for a day or so, but it's back. Here's the link I use to get on:
http://www.simplifying.net/cgi-bin/plug ... tion=intro
Give that one a try.
-Kel
The page was inaccessible for a day or so, but it's back. Here's the link I use to get on:
http://www.simplifying.net/cgi-bin/plug ... tion=intro
Give that one a try.
-Kel
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