Join Date: Jul 2012
Location: Southern California
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D/L Ratio Questions for Cruising Boat
Still looking for the ideal cruising boat as we plan our escape from Southern California. The goal now is to sail across the Pacific to French Polynesia and eventually circumnavigate the Pacific a la Hal Roth and I'm sure many others.
I should note that I've always been a seat of the pants type and have little knowledge of non-dimensional figures like D/L ratio but I do know that, while a heavy boat my be a slug in light airs, it's not going to get tossed around the way a light boat would be in bigger seas.
We're looking for a CC in the 45-50 foot range (bumped up from a former max length of 46 feet) and have really taken to the idea of a deck salon. If we can find a used Oyster we can afford, that might be the ticket.
Anyway, the Oysters and other cruising boats we've looked at tend to have D/L ratios between say 240 and 280+, which - based on my reading - seems to be a solid compromise between stability and speed. I'm not really interested in a full keel, long overhang design. A close friend owns a Mason 44 and, while it's beautiful, it's really not very maneuverable and is something of a chore to day sail or enjoy in light airs.
While surfing the web the other day, we came upon the new Elan Impression 494, which is beautiful, a heck of a lot more affordable than an Oyster - we could buy it new - and includes the option of bunk/passage berths right by the companionway, which would work well for us on passage.
The boat was designed by Rob Humphreys, who does the new Oysters, and is recommended for bluewater cruising. It's got plenty of tankage, decent handholds and the option for a full, closed transom instead of a gate/swim platform. I was shocked, however, when I did the D/L calculation to see the boat comes in at an ultra-light 155!
Can anyone shed some light on this? Is Elan full of BS when they say the boat will be comfortable in a seaway? Is the "bluewater" moniker just marketing hype from a company that knows full well that 99% of their customers will only day sail the boat? I may be able to test sail the boat but there's really no way to know how it'll behave in heavy seas or a big swell.
I'd rather not fixate on the Elan 494 specifically, as I'm more interested in the value of D/L ratio for bluewater use in general.
Is there a legitimate "lighter is better" school of thought?
Last edited by ColdCutterRig; 01-31-2013 at 12:45 AM.