Facts & Falacies
30ft 8ton displacement sailboat built in ferro-cement weighs
A 30ft 8ton displacement sailboat built in GRP/FRP
A 30ft 8ton displacement sailboat built in wood weighs
(glass or fibre reinforced plastic), is a method of construction
developed from SRP (steel reinforced plaster, now known
advantage of the action of Osmosis on ferroboat hulls, is
a disadvantage on GRP/FRP constructed hulls.
wood constructed boat with a hole in it will sink at the same
rate as a
lasts forever...even a ferroboat.
biggest disadvantage of a ferro-cement hull in the eyes of
surveyer, is it's almost unique individuality.
estimated 11,000 Hartley ferroboats have been built worldwide.
first solo crossing of the Tasman Sea, was made in a home-built
ferro-cement Hartley 'Tasman 33'.
earliest known ferroboat still in existence, was built by
in France in 1848.
country to have built the most vessels in ferro-cement is the
An estimated 9 million tons were built in the period
Sept 1943 to May 1944 alone.
have been built in ferro-cement from 10ft to 20,000 tons.
For amateur construction using the standard 'Hartley
truss frame', method
around 25ft is about the smallest that can be built
(smaller requires other methods).
smallest and largest 'Hartley ferroboats', that have been
are a 12ft dinghy and the 130ft Steam Yacht 'Blackwater
British designed a 120ft submarine in ferro-cement.