Chat 18 catamaran motoring June 24
An earlier video showed our Chat 18 being used as a power cat fitted with a 6hp outboard and cruising at 6 knots up a Cornish creek. This video is of the same boat, but taken from the shore. Thus rather too shallow water (under 1m - 3ft), so the stern "sucked" more than usual (thank you Froude) and thus limited speed. Deep water is cruicial for optimum speed on all non-planing power boats. A fairing on the outboard leg (as drawn on my Skoota 18, 20 and 24) is essential for larger engines as otherwise there is too much aeration and drag from the leg. Another job for another time.... You can see more on the Chat 18 here https://www.sailingcatamarans.com/index.php/designs-2/2-catamarans-under-25ft/475-chat-18-daysailing-catamaran and the very similar Skoota 18 here https://www.sailingcatamarans.com/index.php/designs-2/6-powercats/489-skoota-18 (The Skoota has more buoyancy aft and of course no sailing rig, deck gear, nor LAR keels.) (as always, no audio on my short videos)
