Successive G-5 series changed machinery, displacement, and machine-gun armament. Series 7 boats displaced about 14 tons and initially carried a 7.62 mm machine gun, sometimes supplemented by a 12.7 mm weapon. Series 8 used a single 12.7 mm gun, while Series 9 increased displacement. Series 10 had 850 bhp engines and a stated top speed of 53 knots. Series 11 raised engine output to 1,000 bhp and speed to 56 knots, with two 12.7 mm machine guns alongside the torpedoes.
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How G-5 production series changed speed and armament
G-5 development increased speed and light gun armament through successive production series.