Correct Prop ?????

[Taz59]

Hi
How do I know if I have the correct prop fitted,just bought 1995 Fletcher Sports Cruiser with Mercruiser 3Litre LX 140hp
Engine Serial Number OF554183
Transom Serial Number OF576974
Drive Serial Number OF530821

Alpha 1 Gen 2
Ratio 2:0

Cheers

 

[Joshua Nichols]

Re: Correct Prop ?????

HArd to know.. Did you read this? http://forums.iboats.com/showthread.php?t=287818

No speed and no RPM data.. Makes it tough.. Only one person on here has a crystal ball...

 

[Taz59]

Re: Correct Prop ?????

Cheers
Manual says WOT 4400-4800
At the moment boat only goes 30mph,next time out what should i check

 

[Joshua Nichols]

Re: Correct Prop ?????

Okay? Is that a GPS speed or a speedo speed?
Okay? I know what the WOT engine speed should be; but what does your TACH say?

Next time out.. Take a GPS.. record the best speed you can get with it trimmed out the best ya can..
Then at that point.. See what your tach says.. That will help folks answers your questions..
Do ya know what pitch prop you run on the boat now?? Sometimes it is stamped on the hub or on the side of the prop.. If you are unsure.. Write down every number on the prop.. Might be able to figure what you got from that...

Jolly good day

 

[Taz59]

Re: Correct Prop ?????

Nice One
when you say trimmed out do you mean the leg right down

 

[steelespike]

Re: Correct Prop ?????

Cheers
Manual says WOT 4400-4800
At the moment boat only goes 30mph,next time out what should i check

We need to know boat details,type,length, dryweight.present prop size (near base of blades or under the prop nut.)
Need max rpm and speed at wot.(wide open throttle)lightly loaded.
Trimming out/up prop away from boat trimming in/down prop closer to boat.
trim in for hole shot out for maximum speed.

 

[Taz59]

Re: Correct Prop ?????

Fletcher 18 Sports Cruiser
18ft
Approx Dry weight 1370kg
Number stamped on Prop
18-832828-C117 L M

 

[Joshua Nichols]

Re: Correct Prop ?????

17 pitch I think

Now all we need is RPM @ WOT(good excuse to good boating)
A kilogram to pound conversion maybe

about 1kg to 2.2lbs? I think? Been a while since geometry class