An item referred to the magazine U.S.R. dated 21 October 1937 reporting that at Hythe a fast motor boat was under construction to be used with high speed towing gunnery targets. She was designed by Scott Paine with as dimensions 57 x 14 x 3.5 feet and was extra ordinary seaworthy able to execute 14-15 runs against the 4-5 runs of a tug. The 2-5.00hp engines made a maximum speed of 30 miles able. She was fitted out with special instruments to check the results of the gunnery practices. Her crew was to number 10 men.