craft of the 71.5-feet type (in the sequence up to 176 and from 502 onwards) were of a modified type, known as a 'Type G' to the Canadians, and were intended to be MTBs. However, some of the earlier boats in the 'Type G' series were only ever equipped 'for but not with' 18-inch torpedo tubes and otherwise were armed as the original 2-pdr MGB variant, functioning as gunboats in the mixed 29th Motor Torpedo Boat Flotilla alongside the torpedo-armed MTB versions from 1944. Camper and Nicholson All Camper & Nicholson MGBs were composite-hulled craft. The entirely gun-armed MGB 502 class was preceded by the experimental MGB 501, which was a unique vessel adapted from a combined MA/SB & MTB design and completed in 1942 as a combined MGB & MTB, with 1 x 2-pdr pom pom, 1 x Oerlikon cannon, 2 x twin 0.5-inch HMGs and 2 x 21-inch torpedo tubes. The 502 class were slightly enlarged but otherwise based on the design of 501. They dispensed with the torpedo tubes and shipped an armament of 1 x pom pom in MkXVI mounting, 1 x twin Oerlikon in MkV mounting, 2 x twin HMGs and a 6-pdr Hotchkiss gun. Only 502, 503 and 509 were completed as MGBs; 504-508 were completed as fast blockade runners Master Standfast, Gay Corsair, Gay Viking, Hopewell and Nonsuch. Dimensions for the Camper and Nicholson motor gunboats (MGB 502 to MGB 509): Length: Beam: Draught: Displacement: 95 tons Propulsion: 3 × Paxman VRB diesel engines Total power output: 3,000 bhp Speed: Maximum: Continuous: Complement: 21 Endurance: at MGB 509 was powered by three Packard supercharged petrol engines giving a total output of and a maximum speed of 31 knots (27 knots continuous). Later re-numbered MGB 2009, the central engine was replaced with a Metrovick F.2 gas turbine engine in 1947. Elco Elco built twelve MGBs for the Royal Navy. Higgins Higgins built 12 MGBs and 15 MGBs. Fairmile designs Fairmile Marine produced designs for small craft for the Royal Navy but most construction was carried out in other yards. The Fairmile C motor gun boats were long boats. For flexibility the following Fairmile D design (approx. 200 built) could be fitted out either as MGB or MTB. These equipped the Royal Canadian Navy, Royal Navy, and Royal Norwegian Navy. Survivors The only fully restored and operational example of a Royal Navy Coastal Forces MGB