Pretty old school tech. They had there time and place. Surface piercing technology. A light weight rig running higher rpms makes use of those. You still real similar looking stuff on outboards. Not for a Baja 27'. Seems like I see alot of late 80's stuff that still have them. Always hear how much better the bigger heavy ones run when changing to a more modern round ear cupped 3 or 4 blade set up...