Speaking of spinnaker use while racing: my experience on lightweight, planing boats (dinghies, J22, Express 27, Synergy 1000, etc) is that we always use the spinnaker downwind because more power means more faster. The Tartan 37 is a lot heavier and doesn't plane (at least not for us).
So we've come to think the benefit of the spinnaker is in light wind. Under 10 knots apparent, using the spinnaker downwind helps us go 5 or 6 knots instead of 3-4 with white sails. Once the breeze is up to about 15 apparent, the spinnaker doesn't really provide any extra speed. (And then we usually twist it, rip it, or get it fouled up so we can't get the sock down.)
Yes, we need a lot more practice, and maybe some sock improvements.
Does the rest of the fleet agree that the spinnaker doesn't help much in heavy air because, broad reaching with the genoa, the boat is already at hull speed?
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