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I wouldn't know about off topic because it's TLTR!  (Too Long To Read)  Especially the nested blue font...

With added RM at the top from a NACA foil windvane float, the Gougeon-32: P.S.  from G-Wiz!  Russell Brown’s New Toy, April 25, 2018 https://www.epoxyworks.com/index.php/g-32-catamaran-g-wiz/ P.P.S.  Great place to mount a camera or two!

Ya mon!  I can picture that so clearly... 

I'm not surprised.  Raising a long (9 feet draft) daggerboard to match rudder draft reduces draft and wetted surface substantially.  The significant feature is that very little mass moves in the daggerboard, which could be done on monohulls too, but is a given on multihulls. Heavy Weather...

As far as I know, it's been common lore for 50+ years(?) that bluewater multihulls, when sailing downwind or in rough seas from unfavorable directions, will raise their main (forward, deepest) daggerboard(s) to improve directional stability.  It has no effect on their righting moment since they...

KAURI, 35 years ago.