Yes another prop question.

You know the drill..

Moderators: Redneck_Randy, badmoonrising, lakerunner

Post Reply
Message
Author
CaptainBob
Posts: 49
Joined: Fri Apr 29, 2011 7:08 pm
Location: Elgin SC

Yes another prop question.

#1 Post by CaptainBob » Sat Jun 04, 2011 8:20 pm

I bought a new Turning Point prop a month ago and it was a 13 3/4 x15. Wot rpm at that time 5400 which was in my range (5000-5500) Now I am at 4900-5000. I haven't hit anything. So why could this be happening?? Also This is driving along with the same load or even pulling a tube. I am lost. :donno
2000 Fisher 200 dlx 20'
2001 Mercury 90hp 2 stroke

spurhunter
Posts: 798
Joined: Mon Feb 21, 2011 3:20 pm
Location: Cleveland, TN
Contact:

Re: Yes another prop question.

#2 Post by spurhunter » Sat Jun 04, 2011 8:29 pm

Only two things I can think of, your either loosing compression, or a blade is bent. Even the SLIGHTEST bend can possibly make a difference sometimes.
Custom 89 24' Procraft Funchaser Tri-toon
1985 Johnson 175 gas guzzler
2007 2500HD Duramax Z71

CaptainBob
Posts: 49
Joined: Fri Apr 29, 2011 7:08 pm
Location: Elgin SC

Re: Yes another prop question.

#3 Post by CaptainBob » Sat Jun 04, 2011 9:00 pm

I didn't see any bends today when I checked. And it is getting worst everytime I go out. This could cost me some $$$.
2000 Fisher 200 dlx 20'
2001 Mercury 90hp 2 stroke

User avatar
ROLAND
Posts: 4248
Joined: Sat Oct 03, 2009 4:29 am

Re: Yes another prop question.

#4 Post by ROLAND » Sun Jun 05, 2011 12:46 am

CaptainBob wrote:I bought a new Turning Point prop a month ago and it was a 13 3/4 x15. Wot rpm at that time 5400 which was in my range (5000-5500) Now I am at 4900-5000. I haven't hit anything. So why could this be happening?? Also This is driving along with the same load or even pulling a tube. I am lost. :donno
I kind of noticed somthing along the same lines today. New prop on my boat at the beginning of the season... was turning 6000 to 6100 rpms. Today I noticed that at wot I was maxing out at 5800 rpm's. Now there were 4 people on the boat instead of just two... could that make a difference, how about the lake being alittle more choppy than the time before? I'm fine with it turning 5800 since yamaha recommends 6000 max for my motor, just curious as to what could reduce me 200 rpm's or so within a month....
Roland & Jo
2010 Bennington 20 Sfi
Yamaha 75 4 Stroke
Shreveport, Louisiana

User avatar
rrhodes
Posts: 284
Joined: Tue Apr 05, 2011 1:35 pm

Re: Yes another prop question.

#5 Post by rrhodes » Sun Jun 05, 2011 6:32 am

Heavier loads will drop your rpm. As far as dropping 500 RPM, I would do a compression test on your motor. Something is not right and I doubt it is the prop.
Rick
2008 JC Neptoon 25TT
115hp Honda 4-stroke
2007 Suburban LTZ
Lake Murray, SC
Image

CaptainBob
Posts: 49
Joined: Fri Apr 29, 2011 7:08 pm
Location: Elgin SC

Re: Yes another prop question.

#6 Post by CaptainBob » Sun Jun 05, 2011 8:41 am

One other thing can dirty toons affect it since I wet slip??
2000 Fisher 200 dlx 20'
2001 Mercury 90hp 2 stroke

User avatar
wed
Posts: 144
Joined: Sun Aug 23, 2009 7:22 pm
Location: Lafayette Louisiana

Re: Yes another prop question.

#7 Post by wed » Sun Jun 05, 2011 9:26 am

Check the tach and make sure something has not happened to it.
2009 Tracker Fishing Barge 21 /NV logs/90 Merc 4 stroke
2007 GMC Sierra
Toledo Bend Reservoir Louisiana (mostly)

margaritaman
Posts: 6078
Joined: Tue Feb 16, 2010 3:37 pm
Location: Florida

Re: Yes another prop question.

#8 Post by margaritaman » Sun Jun 05, 2011 8:02 pm

CaptainBob wrote:One other thing can dirty toons affect it since I wet slip??
If you have things growing under the waterline on your toons it will definitely affect your rpm and speed. The same goes for V hull boats.
Cruising the salt waters of East Florida.

CaptainBob
Posts: 49
Joined: Fri Apr 29, 2011 7:08 pm
Location: Elgin SC

Re: Yes another prop question.

#9 Post by CaptainBob » Mon Jun 06, 2011 3:57 am

margaritaman wrote:
CaptainBob wrote:One other thing can dirty toons affect it since I wet slip??
If you have things growing under the waterline on your toons it will definitely affect your rpm and speed. The same goes for V hull boats.

What can I do to the toons to keep stuff from growing on them?
2000 Fisher 200 dlx 20'
2001 Mercury 90hp 2 stroke

User avatar
rrhodes
Posts: 284
Joined: Tue Apr 05, 2011 1:35 pm

Re: Yes another prop question.

#10 Post by rrhodes » Mon Jun 06, 2011 5:37 am

You wouldn't notice this change in one outing. If you leave the dock with dirty toons you should see the same performance issues then.

as far as keeping them clean, pressure wash them regularly and you should be fine unless they already have allot of build up.
Rick
2008 JC Neptoon 25TT
115hp Honda 4-stroke
2007 Suburban LTZ
Lake Murray, SC
Image

User avatar
Bamby
Posts: 1409
Joined: Mon Nov 03, 2008 7:30 am
Location: Near Wheeling W.V.

Re: Yes another prop question.

#11 Post by Bamby » Mon Jun 06, 2011 6:23 am

Besides dirty pontoons which will cut into your performance there are a few other things that can cause a loss of performance. On my boat the switch from ethanol free fuel to ethanol cost me 200 rpm's off the top. Another thing it done was effectively clean the fuel system displacing it to the fuel filters which then also needed purged and replaced. Your boat is getting enough age to it maybe go over the basics first which wouldn't really heart to do anyway.

First pull all the spark-plugs and inspect them for firing, carboned up, excessive gap, etc. and replace or re-gap as necessary.

Take a look at and or replace all the fuel filters.

Also check the fuel lines and verify they are both unobstructed and in sound condition. Due to ethanol some fuel lines are failing and separating in the cores and effectively blocking fuel flow to the motor.

Once you've verified and checked for function all the basically maintenance items it may then be the time to "dig deeper into your problem".
Respect Our Recreational Resources
Leaving Only "The Footprints of Your Passing"

Boating the Muskingum River
1972 35' Crest Pontoon Houseboat
2007 90 hp. Yamaha

Post Reply