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ggh said..
Q1. Do they significantly increase the efficiency of the sail due to the stiffness ? IE will the average hack feel the difference ?
Q2. And do they reduce fatigue ?
Q3. When you compare the weight difference there is as little as 20 grams between them. Six to seven hundred dollars for a 20 gram saving in weight just seems over the top. Or is this when question one comes into play?
A1. You will be able to feel the difference i.e. the increased stiffness and reduced weight of the carbon boom, however I think it is unlikely this would translate into any noticeable sail efficiency improvement for an average sailor (although it does feel much better).
A2. Looking at the 140-190 specs of the Platinum Aero 1.85kg vs Silver 2.35kg, the weight difference is 0.5kg. Approx 20% reduction. This is significant but in the context of holding a 5m sail in a 20kt breeze it is relatively small, hence I think it would be unlikely to noticeably reduce fatigue.
A3. As above, the difference is more like 0.5kg which is a significant weight saving and may be worth the extra money depending on your circumstances.
Summary of benefits:
a) noticeably lighter when not blasting (ie in gybes, transitions, carrying)
b) noticeably stiffer
c) increased strength & durability
Based on (a) and (b) it is generally more enjoyable when using a light & strong carbon boom.