This July, I conducted performance testing on Lake Saint Clair with winds less than 10 mph and waves less than 0.5 feet. Engine runtime about 12 hours, fuel tanks
and water tanks
at half. Two occupants and essential load out only, so weight about 8500 pounds. On all runs the tabs were set to position 5 (recommended by Aspen). Engine RPM
areas of interest, 1) turbo activates 1500 to 1700, 2) wake from both hulls create drag 2400 to 2800. Subsequent boating
under less than ideal conditions similar with this performance.
At the Volvo
engine commissioning, the Volvo
tech was very impressed with performance, fuel
economy and sound levels. During the performance testing sound level at the helm
measured between 55 db @ idle and 70 db @ 3200 rpm
then plateaued to WOT, 4000 rpm. In choppy conditions 1 foot with period less than 1 sec speed above 3200 rpm comfortable; in swell or crossing wakes speed balanced with angle off bow and use of tabs achieves best comfort.
Ran the boat on Lake Erie with 2.5 foot significant height waves and period of 2 seconds with some discomfort but acceptable with short duration.