Umm.. skiffs and australian sharpie classes have long had flatties as part of their sails.. The original skate and VJ kite was assymetrical.. with a furler.. one tacked/gybed the kite by throwing the pole over the forestay and replacing it on the mast.. May I point out "ballooners" were used before "genacker" in the 30s.. fuller cut sails that flew from long "bowsprites".. This practice died when bowsprites died.. To be resurrected by beasho on assymetric poles in the 90s..