Prop Question

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wickedcool16

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Aug 7, 2002
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Hello:<br /><br />I am new to boating so please bear with me.<br />I have a coulpe of questions. the first is I was running my boat yesterday and hit the bottom. I dinged the prop just a little bit. Should I be worried about this? Should I have anything looked at? Should I have the prop fixed?<br /><br />The other question is what size do I need. I have a 1990 mercruiser 350 5.7 with an Alpha One drive with a 1.47 gear ratio. What size diameter do I need. Any help would be great..<br /><br />Thanks
 
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karayj

Chief Petty Officer
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Aug 4, 2002
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Re: Prop Question

first take a close look a small ding dont worry if its bent bad the fact that its out of balance will cause problems down the road if you need a prop buy it from ebay very cheep 3rd on the prop between the fins on the round shaft try to see if you can se a serial stamping like 48-17824-40-23 that will help you or if you look at the back of the prop where the look for the numbers on the hub again 48 17824-23
 
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karayj

Chief Petty Officer
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Aug 4, 2002
Messages
468
Re: Prop Question

I looked up some info on baot us you should be a<br />14 1/4 x 19 pitch
 
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Spidybot

Lieutenant Commander
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Re: Prop Question

Minor damages can be ignored - if you feel comfortable about it. Performance may be affected, and if it's out of balance (vibrates) it puts extra stress on bearings etc.<br /><br />Props' dimensions are designated by diameter and pitch. Pitch is the nominal travel by one turn and is stated in inches. High pitch equals a high gear on a car (or bike) and by using the right pitch for your boat setup and use, you can make your engine perform optimal within the rated rpm range at WOT.<br /><br />Much more info here: http://www.iboats.com/cgi-bin/ubb/ultimatebb.cgi?ubb=get_topic;f=17;t=015097
 
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wickedcool16

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Aug 7, 2002
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Re: Prop Question

Ok, so I have an Idea what the pitch does, but what does the diameter do as far as performance wise? How big or small can a person go?<br /><br />Thanks again
 
flashback

flashback

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Jun 28, 2002
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3,963
Re: Prop Question

Small dings can be filed out of a prop as long as you take a little metal out of the other blades as well. most important is that you keep the prop in balance, I have a cone shaped piece of metal, a plumb-bob in reverse, with a string in the center of it. I put the prop on it and hang it from a joist in my basement. depending on which way it leans can tell me if one blade is heavier than the others. hit the heavy one with a file and you can get it balanced... may be a bit archiac but it works pretty good... good luck
 
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