hi Paul I have one of these boats and its fitted with a brushless motor, its a Turnigy d2830/11 1000kv running on 11volt lipo and its more than fast enough.I will post some pics if you like.my boat is at least 25years old and still sails very well regards sammyk

Hi Paul I have posted an album of the piranha pictures hope this helps. the turn fin under the hull is made from aluminium and is 28mm long and 16mm deep and 23mm from the stern, it was fitted to the hull when I bought it. the rear fins are made from aluminium and added by me they help to stop the boat bouncing ,keeps the nose down when powering though rough water they are42mm in width 40mm long and tapers to 28mm and adjustable. I all so fitted an air vent in the cockpit to help keep everything cool inside the hull with exit vents at the rear of the top cover all helped with a small cooling fan above the motor.regards sammyk