Model Variants (Including Prototypes)
WB III - William Beardmore and Company company designation; navalized version of the ship-borne Sopwith Pup; folding wings; removable undercarriage; straight parallel struts.
SB 3 - Official Royal Naval Air Service series designation.
SB 3F - Initial production models; 13 examples produced.
SB 3D - Improved SB 3F; jettisonable undercarriage; emergency floation equipment in a lengthened fuselage.