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Author Topic:   Outrage 18 Hull Weight

nedstephenson posted 09-12-2015 10:58 AM ET (US)
I have read all I could find about hull weight [of a Boston Whaler OUTRAGE 18 boat] and water in the hull, but I still have a question. I re-powered my 1986 18' Outrage, and, when the engine was off, I drained the fuel tank and removed the battery and the gear, leaving the console, pedestal seats and bow rail. I weighed [the hull] off the trailer on commercial scales. The hull weighed 1,920-lbs, which is 670-lbs over the factory listed dry weight of 1,250-lbs. If that is water in the hull, it is 80-gallons.
It seems that the boat sits lower in the water than it should; when rigged with a Yamaha F115 four-stroke-power-cycle engine, the transom drain holes are submerged at standstill. Also, when taking off from a standstill, the stern goes way down and bow way up until it planes, then it rides just fine after it planes off.
Does anyone have similar experience and advice as to whether I have a waterlogged hull?
Ned
vin1722or posted 09-12-2015 11:48 AM ET (US)
I also have a 1981 OUTRAGE 18 with the same Yamaha F115 four-stroke-power-cycle engine. My boat's transom drain holes are 1-inch above the waterline at rest. The boat has a full fuel tank and two batteries.
You should check for water [in the hull]. [My boat] had 25-gallons of water and 200-lbs of wet foam that I had to remove when I got the boat three years ago. The old waterline was actually where yours is now, with the the rear drain holes 1-inch below the waterline [at rest]. Good Luck.--vinny
Hoosier posted 09-12-2015 01:12 PM ET (US)
Vinny, What method did you use to get the water out?
masbama posted 09-12-2015 01:47 PM ET (US)
And how does one check for water in the hull?
jimh posted 09-12-2015 11:36 PM ET (US)
The manufacturing methods used by Boston Whaler in c.1980 production of Unibond hulls like an OUTRAGE 18 probably allowed for more weight variation among finished hulls back then than is tolerated today. In the 1980's the amount of resin used in the laminates probably varied from hull to hull, depending on the crew doing the lay-up. The amount of foam poured into the hull was also likely to vary, as the foam was usually mixed by hand. And there has been speculation that many of the weights given for hulls in this era are light weights.
The nature of the Unibond hull with the expanded foam interior filling the space between the double bottoms also suggests that there is some entrapped moisture in all hulls, a result of the foam process.
On the basis of all those considerations, one ought to allow some leeway for hull weight to deviate from the published specifications. Since weighing just the hull is a difficult process, the position of the transom drain holes relative to the waterline is a simpler method to judge the hull weight, if an allowance is made for the engine weight on the transom.
For the boat under discussion, a departure of 670-lbs does seem like too much variance to be just due to production variation, unless the hull was laid up as a work boat hull.
vin1722or posted 09-14-2015 02:38 PM ET (US)
Sorry for the delay,i cut the boat open in front of the transom and removed all the wet foam(200 lbs of foam).Reglassed it and she is sitting about 1.5" above the rear drains .It was a 2 year resotration and i just hung a 2015 115xb yamaha four stroke this week on the back.

vinny
elvis posted 09-14-2015 02:55 PM ET (US)
Do you have photos? Thanks!
jimh posted 09-15-2015 11:30 AM ET (US)
For the new topic of how to make a repair, please start a new thread in the REPAIRS/MODS discussion area. This thread began as just an inquiry about hull weight, not a discussion of how to remove and repair foam saturated with water.

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Author	Topic: Outrage 18 Hull Weight
nedstephenson	posted 09-12-2015 10:58 AM ET (US) I have read all I could find about hull weight [of a Boston Whaler OUTRAGE 18 boat] and water in the hull, but I still have a question. I re-powered my 1986 18' Outrage, and, when the engine was off, I drained the fuel tank and removed the battery and the gear, leaving the console, pedestal seats and bow rail. I weighed [the hull] off the trailer on commercial scales. The hull weighed 1,920-lbs, which is 670-lbs over the factory listed dry weight of 1,250-lbs. If that is water in the hull, it is 80-gallons. It seems that the boat sits lower in the water than it should; when rigged with a Yamaha F115 four-stroke-power-cycle engine, the transom drain holes are submerged at standstill. Also, when taking off from a standstill, the stern goes way down and bow way up until it planes, then it rides just fine after it planes off. Does anyone have similar experience and advice as to whether I have a waterlogged hull? Ned
vin1722or	posted 09-12-2015 11:48 AM ET (US) I also have a 1981 OUTRAGE 18 with the same Yamaha F115 four-stroke-power-cycle engine. My boat's transom drain holes are 1-inch above the waterline at rest. The boat has a full fuel tank and two batteries. You should check for water [in the hull]. [My boat] had 25-gallons of water and 200-lbs of wet foam that I had to remove when I got the boat three years ago. The old waterline was actually where yours is now, with the the rear drain holes 1-inch below the waterline [at rest]. Good Luck.--vinny
Hoosier	posted 09-12-2015 01:12 PM ET (US) Vinny, What method did you use to get the water out?
masbama	posted 09-12-2015 01:47 PM ET (US) And how does one check for water in the hull?
jimh	posted 09-12-2015 11:36 PM ET (US) The manufacturing methods used by Boston Whaler in c.1980 production of Unibond hulls like an OUTRAGE 18 probably allowed for more weight variation among finished hulls back then than is tolerated today. In the 1980's the amount of resin used in the laminates probably varied from hull to hull, depending on the crew doing the lay-up. The amount of foam poured into the hull was also likely to vary, as the foam was usually mixed by hand. And there has been speculation that many of the weights given for hulls in this era are light weights. The nature of the Unibond hull with the expanded foam interior filling the space between the double bottoms also suggests that there is some entrapped moisture in all hulls, a result of the foam process. On the basis of all those considerations, one ought to allow some leeway for hull weight to deviate from the published specifications. Since weighing just the hull is a difficult process, the position of the transom drain holes relative to the waterline is a simpler method to judge the hull weight, if an allowance is made for the engine weight on the transom. For the boat under discussion, a departure of 670-lbs does seem like too much variance to be just due to production variation, unless the hull was laid up as a work boat hull.
vin1722or	posted 09-14-2015 02:38 PM ET (US) Sorry for the delay,i cut the boat open in front of the transom and removed all the wet foam(200 lbs of foam).Reglassed it and she is sitting about 1.5" above the rear drains .It was a 2 year resotration and i just hung a 2015 115xb yamaha four stroke this week on the back. vinny
elvis	posted 09-14-2015 02:55 PM ET (US) Do you have photos? Thanks!
jimh	posted 09-15-2015 11:30 AM ET (US) For the new topic of how to make a repair, please start a new thread in the REPAIRS/MODS discussion area. This thread began as just an inquiry about hull weight, not a discussion of how to remove and repair foam saturated with water.