Thornycroft test tank model

An example of the scaled model boats used by Thornycroft

This is two views of one of the wooden boats that Thornycroft used to test the performance of of boat designs.  This particular model is of an inverted V step hull, a date on the photograph dates it to 1934. The V step design both reduces the surface area of the boat in contact with the water and enables the craft to cut through the water cleaner.

The models were tested in the experimental test tank at Steyne Battery, Bembridge, Isle of Wight by John Isaac Thornycroft and his daughter Blanche Coules Thornycroft

Thornycroft test boat