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scotty cannella
Member
Username: bigdog86
Post Number: 26
Registered: 06-2009
| | Posted on Thursday, July 02, 2009 - 12:44 am: | 
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hi i was wourding should i switch from a 4 blade prop to a 3 blade prop will it make the motor run any better i have an 87 mariner 150 magnum will it take any stran off the motor whats the diff as in what is a 4 blade good for vs a 3 blade |
Fastjeff
Senior Member
Username: fastjeff
Post Number: 6179
Registered: 09-2003
| | Posted on Thursday, July 02, 2009 - 06:06 am: |
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About 500 bucks missing from your walet!
Jeff |
scotty cannella
Member
Username: bigdog86
Post Number: 27
Registered: 06-2009
| | Posted on Thursday, July 02, 2009 - 12:40 pm: |
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well i have a 4 blade on it right is there any reson i should switch to a 3 blade |
Graham Lamb
Senior Member
Username: galamb
Post Number: 5527
Registered: 05-2007
| | Posted on Thursday, July 02, 2009 - 01:06 pm: |
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The two styles serve different puroposes, so it depends how you use the boat.
A 3 blade will ultimately give you better top end performance - not so much that you will really notice, but could see a couple more mph at wide open.
The 4 blade will get you out of the hole faster, get you on plane sooner and keep you there at a lower speed than a 3 blade will.
So if you use the boat to tow ski's, tubes, boards or do alot of cruising or travel distances in "no wake" or reduced speed areas (canals etc), then the 4 blade is the better choice.
For just general "horsing around", the 3 blade can be considered a "standard" prop.
Since you are running a 4 blade you would normally move up in pitch by 1" going to a 3 blade of similar characteristics (same diameter, same material ie. stainless, or whatever, cupped or not cupped).
However, if you were running say a 19 pitch 4 blade aluminum (non cupped) moving the a 3 blade stainless would probably stay at 19 pitch since the stainless flexs a little less/bites a little harder than aluminum or composite.
Selecting a prop is a bit of trial and error with a little bit of science thrown in... |
scotty cannella
Member
Username: bigdog86
Post Number: 28
Registered: 06-2009
| | Posted on Thursday, July 02, 2009 - 01:52 pm: |
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thank u so much |
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