Originally Posted by FF
On ships it was found the bulbs were built for long term operation at one cruise speed.
Change the cruise speed and you need to remove and redesign the bulb.
Big bucks unless you measure fuel burn in tons per day.
I have read this in relation to smaller yachts, too.
Particularly, I was reading about the bulb design on the Nordhavn 62. The bulb offered advantages in fuel burn at full cruise. But if one throttled back slightly to extend range for a long passage, the savings evaporated.