to me. yer boat shouldn't need to be self bailing as it shouldn't leak....
anyways. i assume yer boat is a regular speedboat. i've never thought about applying this idea to a boat. but for jetskis, w/o self bailing capabilities. the make a plug that is self bailing underway.... just a thought...a example... http://www.atlanticjetsports.com/bilge_flappers___drain_plugs.htm
no idea if they work....