Dave & Nancy said: "The Martec folding props can fail to open a blade and are worthless when they fail requiring a trip over the side. The geared folders like the Gori and similar ones make sure both blades open at the same time and amount. A better mousetrap, IMO." Speaking from 30 years of experience using Martec prop on two sailboats -- if a blade does fail to open, and it does happen occasionally, you engage reverse, rev it a bit, then quickly shift into forward. The martec, I believe, has the most streamlined shape of any prop (more so then a Gori) which appeals to racing sailors. Robby Dolores E., SF Bay