I was an IRC measurer for a for a few years, when IRC was just gaining
popularity in the USIRC is a measurement rule, and requires that boats be
measured or for production boats that the manufacturer certify the empty
weights.IRC required that we weigh boats from a single calibrated load cell
hanging from a crane. For a while they also allowed us to use 4 calibrated
truck scales, one under each.wheel of a travel lift.We would weigh the travel
lift first, then weigh the boat in the travel lift,, the subtracting out the
weight of the travel lift to compute the empty boat weight. Later they
discouraged the use of truck scalesThey never would allow us to use the travel
lift built in scales. They we deemed too inaccurate, and depending on the
system we dependent on the angle of the slings in the lift.
Certified class boats were usually within 1 or 2 % of the Manufactures numbers.
C&C was not a certified manufacturer in the early days-- maybe later, but I
don't know.When we measured a boat, we often would find differences of 10% or
so between stock boats, mostly higher that the sales brochure.
If you are truly interested in this topic you can download a copy of the IRC
measurers hand book.I haven't kept up with the latest IRC happenings but the
IRC rule is still being used around the world
G Donald Wagner
don.wag...@verizon.net
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