Re: Prop Blowout
Usually with a spun hub you don't really have to mark much of anything. Just go out and try to bring the engine speed up to over about 2,000 RPM with out it breaking loose.<br /><br />I immagine what you are talking about is plain old everyday ventilation. A lot of folks call it cavitation, but that's not he right term. Cavitation is a condition in which very small bubbles form on the propeller blades because of extremely low pressure and their collapse errodes the metal of the blades. Ventilation is quite different. When one blows out from ventilation what is happening is that the pressure in front of the blades is so low that it will allow surface air to be drawn down to it. Outboard props move water very well but they are terrible in air, so because it can't get a bite in the airiated water it slips like crazy and the engine RPM's soar. Just backing off the throtle for a moment corrects it and you will probably not even fall off plane if you catch it quick. The cause of ventilation is simply to high an engine mounting. Of course some props hold on better than others too, and that is why you can get away with running a 4-blade higher than a 3-blade.<br /><br />Thom
