Kelsall Trimaran Polars

[andresesteve95]

Hello,

I am looking to buy a trimaran built in the Netherlands.

Anyone know how fast these can be sailed (when crusing) upwind, downwind in moderate conditions (force 4 or so without Gennakers etc. just Jiob and Main) attached are some photos and these are the specs:

LOA: 11.3m (Without bowsprit)
LWL: 10.9m
Beam: 9.1m
Draft:0.7m (Boards up), 1.5m (Boards down)
Displacement: 4100kg

Main: 54m^2 (square top, fully battend)
Genoa 36m^2







If anyone has polars of a similar boat I would live to have them.

Cheers,

Andres

[purvisgs]

It might be helpful to put the model/design & year or decade built, ex; k39. or kss 38 etc.. and if you have them, plans/drawings.

You're not going to find polars, it's vintage, it's custom/homebuild not production.

Polars from a "similar boat" would be useless -even a visually (or specs wise) "similar" tri wouldn't be close enough to make anything more than a wild guess..

Multihull dynamics (nowadays paid site) might be a good source of getting the type of data you seem to be after- (if you have the full specs/design/drawings & you're willing to spend $ on getting the design added or a custom report etc, that is. No kelsall tris in the general pre-existing database, only Kesall cats) - But even if you're not getting a full custom evaluation, for a small membership fee - you might still consider signing up- likely would still be able to find a "somewhat similar" ~40 ft tri on their site, look over the #s- and do some comparisons to other boats.

"Similar" cruiser/racer 40ft tris might (perhaps a little optimistically) hope to *average* ballpark 7 knots on passages, likely a bit less, maybe a tad more pushing hard with a race crew/mindset or on downwind runs.

Keep in mind the multihull "average" speeds you see thrown out there are often accompanied by some bias and could, often, be more accurately described as "average in ideal conditions".. On similar boats pushed hard with good sails - 200 mile days (8.3 knot average over 24hr) for example are probably do-able but not exactly easy or common.

[andresesteve95]

Thank you this is super helpful!