Would this prop suit my engine?

[steam_mill]

Re: Would this prop suit my engine?

stant1man:<br /><br />I bought a 19" for my boat used and went to 21" for my Merc.<br /><br />I still have the prop. It is used but rebuilt. It has a permanent mounted hub.<br /><br />Email me if you want to talk:<br /><br />joe.sue.ferreira@sympatico.ca

 

[achris]

Re: Would this prop suit my engine?

Stan,<br /><br />I just about have to stand my boat on it's nose to make the prop let go.<br /><br />I am very keen to buy your 21" Laser.<br /><br />Chris............

 

[stant1man]

Re: Would this prop suit my engine?

As soon as the prop comes through i'll let you know Chris. I dont understand what you mean by let go? what does that mean. Like when you get cavitation it wont "grab" the water again?<br /><br />Or is not letting go a good thing? I dont need to worry about sea weed where i go with my boat but I suppose cavitation is something that can never be avoided.

 

[achris]

Re: Would this prop suit my engine?

Stan,<br /><br />Correct again. The 4 blade holds the water very well. And yes, to 'let go' is to lose grip on the water and spin veeeery quickly, and not go anywhere. The term 'cavitation' is often used where the correct term is 'ventilation'. The difference?<br /><br />Ventilation is where the propeller is ventilated to atmosphere. ie, air gets into the blades and the prop loses grip on the water.<br /><br />Cavitation is where the angle of attack between the blade and the water becomes so high that the water on the low pressure side of the blade 'boils', effectively creating a 'cavity' that the blade spins in. <br /><br />The result felt by the driver is the same, but the cause and effects are very, very different. If a prop has been cavitating then 'cavitation burns' will be seen on the low pressure side of the blade(s). This causes quite severe erosion of the aluminium and is easy to pick. Looks like the blade has been sand-blasted near the leading edge. Ventilation doesn't leave any marks like this. <br /><br />Chris.............

 

[stant1man]

Re: Would this prop suit my engine?

Good good, well im very willing to lose a little top end to gain more control in the water!<br /><br />Thanks for the info Chris im learning alot. I always thought that on my old engine the prop was spinning up because i had air caught in it but what you have described would explain the tell tale marks on the prop.<br /><br />Thanks<br /><br />Stan......

 

[stant1man]

Re: Would this prop suit my engine?

Chris that prop arrived, if you still interested send me an e-mail. Im currently looking for a stainless 4 blader for my engine. What pitch should I aim for????? 17-19??????<br /><br />Where is the best place to look???<br /><br />Stan........