For a predominantly downwind race in fresh conditions fresh enough for two large cats to capsize the average speed for the 14 finishers was approx 10 knots for an average boat length of approximately 12 meters.
Catamaran speed boat speed. Pro Boat Veles 29 Catamaran Brushless Electric RC Speed Boat OverviewThe Veles 29-inch Catamaran looks as good as it performs. This boat should have no trouble appealing to safety-minded bluewater cruisers who are looking for fast and easy passage-making. The square root of 64 is 8 and 8 times 33 equals 264 knots.
The short answer is- from my perspective- that I agree with you 6-7 knots for a 30 ton 18 m cat in 20-30 knot winds is not good sailing performance. With a top speed of 122-plus-mph the model is among the fastest in the breed. A trait all Catanas share is twin helms one on each hull.
Pointing ahead before the wind reaching up to 29 knots. While the Fountain 32 Thunder Cat likely isnt the most refined sport catamaran on the market it definitely was the most important addition of the new year. This concept has been in Catanas DNA from the very beginning.
The 416 metre 400 pax high-speed catamaran features the super efficient seaspeed deep vee Seacat hull for Shanghai waterways. A 60 foot cat with 25 bean cruising at 89 knots at well over 2 mpg. So the rules about limiting displacement speeds still apply to Cats its just that the slim hull gives then a much higher displacement speed.
That gives you a k factor of 33 - the k factor replaces the usual 135 that you multiply times the square root of the waterline length to get the hull speed. Dong Hai was launched in December 2008 with excellent performance results. Deciding between a catamaran and a monohull is a big decision and one worth considering well before taking the plunge.
Personally I find the most important benefit of speed of a multihull is the ability to outrun bad weather. Boarding takes place around 900 am. See Fountain Powerboat listings.