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re: Jib vs Genoa vs Spinnaker
Not quite... A Jib is a 100% (or less) foretriangle headsail.. A genoa is typically a 120 to 155% foretriangle headsail. Both are set and used similarly, with jibs being deployed in heavier air, genoas lighter.
A symmetrical spinnaker is quite different. Colourful, yes.. Usually made of lighter nylon material but it is a 'flying' sail that sets ahead of the forestay usually on a pole.
Cruising spinnakers, drifters, Asails, etc more closely approximate large, light, colourful genoas.. They do not attach to the forestay like jibs and genoas, and don't usually need/use a pole, though short bowsprits are often used.
Hope that helps a bit.
1984 Fast/Nicholson 345 "FastForward"
".. there is much you could do at sea with common sense.. and very little you could do without it.."
Capt G E Ericson (from "The Cruel Sea" by Nicholas Monsarrat)