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Has anyone experienced a loss of speed with RCBB trim tabs on the Blackjack 42?
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I'll take a crack at an answer based on some personal trials
My H&M Drifter S is a much smaller cat hull but superbly designed to air out nicely. During NAMBA SAW time trials I was attempting to squeeze out just a bit more top end and adjusted the ride attitude to be just on the verge of blowing over. I could break my existing record downwind but upwind I was blowing over (you need a 2-way average for a record). I did try small trim tabs and yes the speed dropped ; I surmised that the tabs kept the hull from airing out enough to reduce the wetted area and added more real estate in the water for more drag so I ditched them. I might have adjusted them to serve only as "wheelie bars" but didn't. Just my experience - others may have different views
Drifter nicely aired out :
drifter aired out 10.jpg2008 NAMBA P-Mono & P-Offshore Nat'l 2-Lap Record Holder; '15 P-Cat, P-Ltd Cat 2-Lap
2009/2010 NAMBA P-Sport Hydro Nat'l 2-Lap Record Holder, '13 SCSTA P-Ltd Cat High Points
'11 NAMBA [P-Ltd] : Mono, Offshore, OPC, Sport Hydro; '06 LSO, '12,'13,'14 P Ltd Cat /Mono -
I appreciate your insight. I am machining the tabs down from 60x50 to 50x40. Will let you know how it works out.Comment
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