Admiralty fleet order 1443/36 laid down the purpose for which these boats were intended

    1. As the principal power boat in ‘Penelope’ and ‘Aurora’
    2. As barges where a larger boat cannot be carried
    3. To supplement the 45ft motor picket boats in certain capital ships

Note that the (upper) hull is clinker-built.


The 30ft Fast Motor Boat of HMS Diadem.

The 30ft Fast Motor Boat of HMS Diadem; HMS Duke of York in the background.