It would be much easier to determine the weight of the water it displaces, if you are unable to place the boat on a scale. Place the boat in the water, mark the water line on the hull. Remove the boat from the water and measure the dimensions or volume of the hull below the water line. then multiply this dimension by the density of water, 62.4 lbs/ cu. ft. (or 1 Kg/dM). The result will be the empty weight of your boat.
for instance a flat bottomed boat, 18 ft long, with a 6 foot beam, drafting 4 inches will displace approximately 36 cu. ft. of water this corresponds to a weight of 2220 lbs.
1 tonne
to calculate the recommended occupancy for any boat under 20ft: length times width divided by 15 L x W / 15 = Maximum occupancy
lengthxwidth/15
1980 campion 18 ft
Fiberglass is actually very flammable.
I would think a fiberglass boat is better than a wooden boat because a wooden one can rot and would be hevy to move weres the fiberglass boat wont rot and is light so would be easy to move.
A sponge and some fiberglass sealers works the best on a fiberglass boat. There are other fiberglass cleaning material available depending on what your particular need is. For just basic cleaning, I would go with the sponge and fiberglass sealer.
You can remove dried barnacles from a fiberglass boat using a stainless steel scrubber or a pressure washer for large barnacles.
A boat floats by keeping water outside, regardless of any material
1937 by Ray Greene
Vietnam War PBR's were built of fiberglass; they worked fine. That's the boat in the film Apocalypse Now.
It would depend on the construction of the craft, but as a general rule, the fiberglass boat will be heavier.