John,
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<br>I agree with You on this point, lets go for a maximim reasonable spi area, for Texel Rating this is 21m^2.
<br>I would suggest to set this also as limit for the F16 HP class.
<br>In fact it's hardly more expensive than an 17^m, time will tell what the best area will be.
<br>I heard a story about the (New)Tornado spi' ; at first they were 25^m, there were complains that they collapsed too soon, and smaller spi's were used. But.. very soon the spi was redesigned, and now a lot of the Tornado sailers again go for the 25^2 spi, as it handles well now.
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<br>This could also be the case for the F16 class
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<br>Geert
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