The Slingshot was designed for 6/7 cell underwater drive and can be a very fast boat. It now has a vertical transom and comes with a self righting lid. You will get a good performance with a standard 540 motor. Made of fibreglass and is 460 mm (18 inch) long.
SLINGSHOT 460mm (18inch) FAST ELECTRIC 6-7 CELLS £39.50