I am looking for details of the Ringleader canoe, described in Adrian
Neison and Dixon Kemp's book Practical Boat Building for Amateurs,
published in London and New York from 1884, and which ran to a number
of editions, at least to 1922.   I have a drawing taken from a
photograph of a Ringleader taken at Inverness.   The canoe was built
by Messenger of Teddington and the sails by Lawrence of Fleet St
London.   I am interested in scale drawings, photographs, and a
detailed description of the canoe

Here is an interesting website:

http://dragonflycanoe.com/stephens/introduction.html

for general work an ordinary Rob Roy is best