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Old 06-08-2014, 04:25 PM   #21
cafesport's Avatar
City: Miami
Country: USA
Join Date: Jul 2013
Posts: 519
This is from ABT's website:

Paragraph 9:

TRAC stabilizer fins and exclusive winglets are computer-optimized to provide the highest lift-to-drag ratio available. Fins are built to exacting standards using modern vacuum-infusion methods, GRP laminates, and structural foam cores. TRAC fins are free-flooding and near neutrally buoyant, reducing overall weight. The TRAC winglets create an "end-plate" at the tip of the fin to prevent the escape of water from the high-pressure side of the fin to the low-pressure side. This increases the overall efficiency of the fin and provides more anti-roll force than conventional offerings. The TRAC winglet also significantly reduces drag creating "tip vortex". TRAC fins and actuators are selected (sized) based on specifics of the vessel hull, roll period, speed range, and meta-centric roll radius.

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Old 06-08-2014, 04:40 PM   #22
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City: Mooloolaba
Country: Australia
Vessel Name: Ohana
Vessel Model: DeFever 72
Join Date: Jul 2011
Posts: 82
thank you for a great discussion. My boat travels at 8knots and is displacement types hull, 53 ft long and have wesmar 6ft fins.

i am not going to pull the boat out to put tips on specifically, but next haul i think it is a relatively easy thing to do with almost no risk as the hydraulic rams and system can work a larger fin already. So i will do this at a later stage and will self judge the outcomes.

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