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Paducah said..decrepit said..
I can't get planning in 12kts, even with my biggest gear I need over 13
Cold air is a lot denser. It's a noticeable difference. It can be worth a sail size (12-15% denser). That's one of the few positives of winter sailing - the air is so much punchier.
Its true that colder is denser - but not as much as people ascribe it to be.If you are comparing 40deg to 0deg, then it is 14%.
Most of us in Straya sail somewhere between 30deg and 10deg which is 7% ** vs sail sizes which vary about 11% per size gap, eg Severne Mach3 7.8 vs 7.0
**Ocean water tends to reduce/increase the air temp that is above it, limiting the max air-temps. Obviously Melbourne Summer Northerly @ 38deg or Tassie @ 4deg are extremes.
Its rare for someone to to experience a full-sail-size difference due to air temp -> its closer to a half-sail-size.