Ferro-cement boats

Facts & Falacies

(1)....A 30ft 8ton displacement sailboat built in ferro-cement weighs 8tons.

A 30ft 8ton displacement sailboat built in GRP/FRP weighs 8tons.

A 30ft 8ton displacement sailboat built in wood weighs 8tons.

(2)....GRP/FRP (glass or fibre reinforced plastic), is a method of construction

developed from SRP (steel reinforced plaster, now known as ferro-cement).

(2a)....The advantage of the action of Osmosis on ferroboat hulls, is reversed to

a disadvantage on GRP/FRP constructed hulls.

(3)....A wood constructed boat with a hole in it will sink at the same rate as a

ferro-cement one.

(4)....Nothing lasts forever...even a ferroboat.

(5)....The biggest disadvantage of a ferro-cement hull in the eyes of the

surveyer, is it's almost unique individuality.

(6)....An estimated 11,000 Hartley ferroboats have been built worldwide.

(7)....The first solo crossing of the Tasman Sea, was made in a home-built

ferro-cement Hartley 'Tasman 33'.

(8)....The earliest known ferroboat still in existence, was built by Lambot

in France in 1848.

(9)....The country to have built the most vessels in ferro-cement is the UK.

An estimated 9 million tons were built in the period Sept 1943 to May 1944 alone.

(10)....Boats 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).

(10a)....The smallest and largest 'Hartley ferroboats', that have been designed

are a 12ft dinghy and the 130ft Steam Yacht 'Blackwater Lady'.

(11)....The British designed a 120ft submarine in ferro-cement.