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New prop put on 60 HP Merc won't get on plane with 3-4 people on boat

2/17/17 @ 8:02 PM
ORIGINAL POST
Mikey68
Mikey68
User since 6/28/04

Last summer I dinged up my prop pretty good so I took it into Pharo Marine to have it looked at and we decided to put a new prop on.  They did so and I had used my boat with no issues until the end of the season when I took the family out for a ride and there was 4 of us and the boat wouldn't get up on plane.  Did they put the wrong prop on?  I'm not the most knowledgeable about props but it seems like it is the same prop and pitch.  Any ideas?

I am thinking of calling them to have them check it but I usually fish alone in my boat or one other person and it was never an issue.

DISPLAYING 11 TO 18 OF 18 POSTS
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2/21/17 @ 1:28 PM
jbird68
jbird68
User since 1/24/05

I've thought about getting a stainless steel prop for my 90 HP Optimax. But my Alumacraft Navigator 165 CS gets up on plane with no problem. I'd still like to get a spare prop just in case. I can get to about 40 MPH with the aluminum prop. Only thing I want to add is a hydrofoil to help keep the boat up on plane at slower speeds. I am not concerned about losing a little top end speed if that happens.  

2/20/17 @ 12:28 PM
Highthrust
Highthrust
MEMBER since 1/21/13

The only way to know if you have the correct pitch propeller is to check Rpm at full speed. With most four strokes you'll need to be near the top of the recommended operating range. Using a lower pitch will help acceleration. But you'll have to make sure you're not over revving the engine at full speed - especially when you are lightly loaded. As one other stated - a four blade with smaller diameter may help your acceleration also.

2/18/17 @ 11:05 PM
Mikey68
Mikey68
User since 6/28/04

Ohhhhhhh how I dream of putting a 90 HP Opti on it.  It is also rated for 90 HP max.  I wish I could afford to trade up.

2/18/17 @ 4:24 PM
Ready2Launch
User since 6/22/05

I own a 2005 single console version of the same boat with a Merc 60 HP. The motor originally had a 13 pitch and it struggled to plane with 3 in the boat. Playing with the trim during take off helped. I dropped to a 12 pitch and it helped considerably. Mine is rated for 90 HP so it is under powered with the 60 HP. I've since repowered with a 90 Optimax.

2/18/17 @ 9:03 AM
Tuffy2
MEMBER since 7/7/04

I have helped several people with your problem in the past. Try running a Mercury Spitfire four blade, or a Quicksilver Nemesis four blade, both in a 10.6 x 12 size and pitch.

Also, make sure that you are doing your best to distribute the weight in the boat as best that you can. 

You do not need a stainless steel prop on a 60 hp motor. It does not create enough torgue to flex the blades to a point of reduced performance. 

2/18/17 @ 7:59 AM
Mikey68
Mikey68
User since 6/28/04

Master_Piker,


1st, thank you for your input and expertise.  I appreciate it a lot.  My boat and motor is a 2004 Tracker Targa 16.6 WT model.  The motor is a Tracker/Merc 60 HP and was an aluminum prop before and is again.  The new prop they put on my boat is 10 3/8 diam, 13 pitch, 3 RH.  The old one I will have to look up.  I believe I kept it and it is out in my garage somewhere.  Sorry I did not include that from the start.  I find it odd the dealer would not have put the same matching prop on it.  I will go and talk to them but I am sure they are not going to want to exchange it at this point.  Live and learn I guess.  I wouldn't mind putting a stainless steel one on it but again, I am not that knowledgeable with props and knowing which one is best for my boat.

Thank you for your input though I really do appreciate the help.  I kind of thought it was the pitch or something about the new prop that was wrong.

2/18/17 @ 12:28 AM
Master_Piker
Master_Piker
User since 12/7/05

Sounds like you are over-pitched to me. When they re-propped your boat did they put the same pitch and diameter prop on? Sounds like they went up a pitch or two, which would probably be OK with you by yourself, but when you add 3 people, the motor isn't able to get into the power band to plane the boat. If you have ever driven a vehicle with a manual transmission, it would be like trying to pull away from a stop sign starting in 2nd or 3rd gear.

I don't have specifics on your boat, motor, lower unit gear ratio, etc. which all play into the equation but based on the information you provided, it sounds like you need to drop one pitch, possibly two in order to plane your boat. Depending on the HP, you may not be able to plane the boat with 3-4 people in it? If you drop too much pitch, you risk over-revving the motor which isn't good either.

Also, prop material makes a huge difference as well. I run a 13x19 stainless on my 70 Evinrude, and have 13x19 and 13.25x17 aluminum props as spares. The 13x19 stainless planes the boat better and runs about 3 mph faster at wide open throttle than either of the other two due to reduced blade flex. This is another possibility as well. Did they replace a stainless prop with an aluminum one, thus reducing performance?

There are several scenarios that could cause what you are experiencing. To better help you, the make and model of your boat, the make and HP of your outboard and the material and size of your old prop and current prop would be very useful information. Not trying to be disrespectful, but without more information all we can do is guess for each possible scenario.

Also, most marinas will have props you can test on your boat before buying. See if you can find a place that does this. Then get a couple buddies to go for a cruise and try to find the correct prop.

Edit: Just noticed you stated it was a 60 HP Mercury..but former and current prop information and boat info would help. I'm not up on the latest Mercury motors, but either way it sounds like you are overpitched or running aluminum when you used to be running stainless.

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