Peter et al,
That's 1.34 X Square Root of LWL(in feet), so the 55 "max" hull speed would be 9.4Kts and the 54 would be 9.5 kts. That's using the Stationary water line - if you're heeled over the water line lengthens out to the Dynamic LWL so the 54's speed goes up to 9.5 kts. I couldn't find a Dynamic LWL for the 55, but assume it would be longer (faster) than the 54.
Also, that abbreviation Lh that Peter mentioned is likely Hull Length, not LWL. Looks like the boat names "Amel 54" and "Amel 55" came from the Hull length rounded up to the next foot. Anyway, here's a buncha numbers from the Amel website in both Metric and Imperial units.
Craig - sv/ Sangaris, SN#68
|Amel 55||Amel 54|
|Per Specifications on Amel website:||M||Ft & In||M||Ft & In|
|LOA||17.3||56' 9.1"||17.2||56' 5.2"|
|Hull Length||16.74||54' 11.1"||16.4||53' 9.7"|
|Stationary LWL||14.85||48' 8.6"||13.75||45' 1.3"|
|Dynamic LWL||15.35||50' 4.3"|
|Beam||4.99||16' 4.5"||4.8||15' 9"|
|Width at Water Line||4.14||13' 7"||4.8||15' 9"|
|Draft||2.2||7' 2.6"||2.1||6' 10.7"|
|Height from water line||21.3||69' 10.6"||na||na|
|Displacement with full load||24t||na|
|Theoretical "max" hull speed= 1.34 X Stationary LWL||9.4||9.0|
|Theoretical "max" hull speed= 1.34 X Dynamic LWL||9.5|
, wrote :
Very interesting - could someone remind me of the formula for Max Hull speed using the waterline length as the basis?
Carango Sailing Ketch
A meter is 39.37 inches.
It puzzles me.
I'm fairly sure that there are 39 inches in a meter. So 17.2 x 39=670.8 inches divided by 12 for feet = 55.9 feet. I'm rather old fashioned in my maths! So I guess the deck length is 55.9 feet.
Then 16.4 m is 53.3 feet - I assume that is the water line length.
But some wise men like Joel or Bill should interrupt this and tell us the actual figures?
Isn’t 17.2 meters 56.4 feet?
And 16.4 meters 53 feet that is the waterline?
Kimberlite SM 376
This could mean the LWL as we Brits call it is 16.4m and the Beam at WL is 4.7.
Max length - deck level 17.2 - max width at widest point is 4.8m
I hope that helps
Carango Sailing Ketch Amel 54 #035 2006.
What is the length at the waterline of the Amel 54 and 55 and its beam?
Kimberlite SM 376