CG Location Calculation
10-09-2009 | 02:23 PM
#1
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Joined: May 2002
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From: DFW
CG Location Calculation
Is there a service or does someone have a formula for finding CG ?
Procedure includes weight of loaded trailer trunnion (axle centerline on single axle, equalizer on tandem and centerline of center axle on triple axle) and weight of the tongue jack. The jack weight and trunnion weight are separate individual weights and found one at a time. The two weights are then added together to find total weight of loaded trailer.
Measurements are then taken, trailer ball coupler to trunnion, boat bow tip to trunnion, overall boat length, trailer overall length.
Empty trailer is then weighed using same procedure used when trailer was loaded (trunnion and jack separately).
Some believe the CG should be located relative to the aft step on a stepped hull.
What would be a fair price for such a service ?
Procedure includes weight of loaded trailer trunnion (axle centerline on single axle, equalizer on tandem and centerline of center axle on triple axle) and weight of the tongue jack. The jack weight and trunnion weight are separate individual weights and found one at a time. The two weights are then added together to find total weight of loaded trailer.
Measurements are then taken, trailer ball coupler to trunnion, boat bow tip to trunnion, overall boat length, trailer overall length.
Empty trailer is then weighed using same procedure used when trailer was loaded (trunnion and jack separately).
Some believe the CG should be located relative to the aft step on a stepped hull.
What would be a fair price for such a service ?
10-09-2009 | 03:49 PM
#4
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Joined: May 2002
Posts: 1,127
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From: DFW
Sean, What boat is that ?
We tried doing that, I guess the floor wasn't level. The boat rolled through the wall, down the street, into traffic and didn't see it for a week. When it finally came rolling back it was hung over and looked like it had even been in a brawl !! Some lady HUH ?
We tried doing that, I guess the floor wasn't level. The boat rolled through the wall, down the street, into traffic and didn't see it for a week. When it finally came rolling back it was hung over and looked like it had even been in a brawl !! Some lady HUH ?
10-09-2009 | 04:06 PM
#6
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Joined: Apr 2004
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From: KC/LOTO
Sean, What boat is that ?
We tried doing that, I guess the floor wasn't level. The boat rolled through the wall, down the street, into traffic and didn't see it for a week. When it finally came rolling back it was hung over and looked like it had even been in a brawl !! Some lady HUH ?
We tried doing that, I guess the floor wasn't level. The boat rolled through the wall, down the street, into traffic and didn't see it for a week. When it finally came rolling back it was hung over and looked like it had even been in a brawl !! Some lady HUH ?
Yes, flat concrete is a requirement for putting it on a roller.
10-09-2009 | 04:15 PM
#7
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Joined: Oct 2007
Posts: 8,439
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From: yorkville,il
Sean, What boat is that ?
We tried doing that, I guess the floor wasn't level. The boat rolled through the wall, down the street, into traffic and didn't see it for a week. When it finally came rolling back it was hung over and looked like it had even been in a brawl !! Some lady HUH ?
We tried doing that, I guess the floor wasn't level. The boat rolled through the wall, down the street, into traffic and didn't see it for a week. When it finally came rolling back it was hung over and looked like it had even been in a brawl !! Some lady HUH ?
10-09-2009 | 04:19 PM
#8
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Joined: Feb 2002
Posts: 5,008
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From: Traverse City, Michigan
Want a science project ? Try doing the overall C.G. which includes vertical and horizontal axis plus centerline offset.
We did this once with a 62 ton Army tank !
Loadcells, overhead crane and rotating pivot plus many H.P.calculators ( pre-laptop/P.C.)
ed
We did this once with a 62 ton Army tank !
Loadcells, overhead crane and rotating pivot plus many H.P.calculators ( pre-laptop/P.C.)
ed
