The Boston Whaler website is already providing extensive information about the 2021 220 DAUNTLESS boat. There is detailed performance information of the 2021 220 DAUNTLESS\, as Boston Whaler always provides for its boats.
According to the Boston Whaler test data, the boat as tested weighed 4,149-lbs. The engine was 250-HP. The top speed observed was 51.3-MPH.
After reading that, I immediately thought: "What is the Crouch Speed Prediction Method hull factor coefficient?"
I took data
HP = 250
LBS = 4149
MPH = 51.3
to the
Crouch's Calculator and found the hull factor coefficient as 209.
A second set of test data (with different propeller)
HP = 250
LBS = 4,369
MPH = 50.3
calculated a hull factor coefficient at 210.
A hull factor coefficient of 209 to 210 indicates a very efficient and fast planing hull. A traditional Boston Whaler moderate v-hull boat like a c.1985 OUTRAGE 22 would typically have a hull factor coefficient of about 190.
Next, I thought: "What was the propeller SLIP was in those tests?"
For the REVOLUTION4 17-pitch propeller the data was input to my
Propeller CalculatorRPM = 6000
RATIO = 1.75
PITCH = 17
MPH = 51.4
and the SLIP calculated to be 7.1
For the ENERTIA 17-pitch the data was
RPM = 6000
RATIO = 1.75
PITCH = 17
MPH = 50.3
and SLIP calculated to be 8.9.
Propeller SLIP below 10 at top speed is a good outcome, indicating a good propeller selection.
Other interesting data in the performance report was the optimum cruising speed fuel economy in MPG.
For the 4,149-lbs boat with the REVOLUTION4, the peak fuel economy was 3.67-MPG at 22.2-MPH and tapering to 3.54 MPG at 28-MPH. I think those figures are very good for boat that weighs over 4,000-lbs.
For the heavier 4,365-lbs boat with the ENERTIA propeller, the peak fuel economy was 3.63-MPH at 22.3-MPH and down to 3.43-MPG at 28.9-MPH, again, very good numbers.
Any fuel economy over 3-MPG seems good for a 22-foot boat, and 3.5-MPG around 28-MPH seems very good. (Of course, for the buyer who has over $85,000 for a 22-foot day boat, to save a few dollars on fuel cost with great fuel economy probably is not a top consideration.)
So there are some interesting performance aspects of the new 2021 220 DAUNTLESS boat to consider.