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Sail Plan/Wind Range
Not to hijack the thread but this is interesting to me. I discovered the same thoughts on larger headsails. Just for fun, I started Wednesday racing my old Hunter 27 this year in our cruising class. I learned a lot about boat speed, or lack therof. For much of the season we either had too much or too little wind so I experimented with sails a bit. I have two genny's that I use, a 155 and a 130 that are on a furler (yes its set up for cruising, and has a grill).
While this might seem elementary to some, in very light air, the 155 is actually harder to fill, especially off the wind (unless its poled out). Despite its larger size, its heavier and has more drag so its seems slower than the 130. At the upper end of the wind spectrum, its size makes it easy to get overpowered, and clearly the 130 is better there too. Obviously that's why those that race seriously have 4-5 staysails.
The 155 is a great sail on my boat, but in a narrower wind range ( maybe 5-15 kts) than its smaller cousin. Above and below, the smaller sail is faster, and easier to handle. Ive always considered my boat fairly good in light air, but racing it taught me a bunch about getting speed out of it in different conditions. Sailing in 10 knots is easy on any boat, Light air sailing takes skill and patience, and the right boat/sail selection. I got slaughtered in both very heavy and very light wind, but did quite well in the middle. Next year, we'll see if I can get faster at the ends of the spectrum.