2012 50HP E-Tec on a Crestliner Storm 16

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I bought a 2012 Crestliner Storm 16 with a 50HP E-tec on it. I've looked at performance reviews of the motor on larger and heavier boats and they seem to be getting pretty much the same speed as I am with my Storm 16. Particularly the Performance test on Evinrude's website of the 16' Sylvan with the 2012 50HP E-tec. That boat is 300lbs more than mine and I only get about 1 to maybe 2 MPH more. Granted they have a SS prop, but it's the same size as my alloy prop.

Am I totally off base here? Or is my motor under performing?

Just wondering if someone could shed some light on this.

Cheers
Brad

 

[steelespike]

Re: 2012 50HP E-Tec on a Crestliner Storm 16

You'll have to help us with the details of your boat and your present prop size wot rpm and speed.
It has been my experience that it seems to me that if you look up aluminum boats apparently of similar size,weight and design
same motor that they will vary in prop selection and performance for no apparent reason.My theory is that some have more rivets
keels and convolutions than others and I suppose one bottom may be more sophisticated than another.
It also appears to me that many times a heavier glass boat will be faster than a similar but lighter aluminum boat again the assumption is that the glass hull is more sophisticated.
I don't think 2 mph difference for 300 lbs is unreasonable.
Did you note the all up weight of the boat and yours?
Don't assume because your boat is new that it is setup right. Your anti vent plate(just above the prop)should be even with or slightly above the bottom of the transom.Be sure that the throttle opens all the way.
I usually suggest that you raise the motor to a point that venting becomes a problem.
There are props that are resistant to venting.
I checked out the storm 16 It appears to have 6 keels,not good for speed.
Also I think that while the flat bottom helps it get up the primitive hull can sometimes lay down too flat causing extra drag.

 

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Re: 2012 50HP E-Tec on a Crestliner Storm 16

My Boat is a JON Boat style aluminum boat, more or less flat bottom. The boat is all welded. I do not have a RPM gauge on the boat, just a SPEEDO, so I don`t know what RPM I`m hitting at full throttle. Think I may put a RPM gauge on it this year though. I`m thinking the RPM`s is far more important then the speed I`m running at.

Testing will have to wait until spring when I can drop the boat back in the water. Was just hoping you more knowledgeable folks could shed some insight on this. I was really expecting the boat to hit the 35-40MPH mark.

Prop is aluminum 13-1/2 x 15

BOAT DETAILS
Overall length-15' 10"
Beam-75"
Bottom width-55"
Side depth-20"
Transom height-20"
Deadrise-8?
Weight (boat only, dry)-610lbs
Max. HP capacity-50HP
Aluminum gauge bottom -.090"
Aluminum gauge sides-.090"
Aluminum gauge transom-.090

 

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Re: 2012 50HP E-Tec on a Crestliner Storm 16

I was also looking at another site that does boat reviews and they tested a Crestliner 17`CW with about the same body style as my boat, and they hit 33MPH at 5400 RPM. This was with a 50 2-stroke Merc. This boat was almost double the weight of mine.

 

[steelespike]

Re: 2012 50HP E-Tec on a Crestliner Storm 16

I think you posted as I was adding the info above that I noticed on the storm.
Is your speed by gps?What is the spee
I checked 3 boats these with 40hp on the Etec site A WACO 18' 600 lbs dry weight 1372 lbs all up weight. 17" ss prop 32.5 @ 5425 6% slip.
Aluma craft 16' 680, 1456 all up weight, 13" al prop,5700 @ 26.2 3% slip.
Triton 16 788 lbs,1350 all up weight,17"ss prop 31.5 @ 5400, 3% slip.
These are all Jon boat types of essentially the same all up weight You can see the extreme difference of the Alumacraft.
The aluminum prop doesn't account for a 4" pitch difference.
On the 50 hp motors the Alumacraft 1650 may be more appropriate to compare to yours.
Its turning 5675 @ 32.6. 1
If less the 30.3 of the Sylvan I I think I would attribute that to those 6 keels on your boat.
Jon boats do tend to have a lot of keels to stiffen the bottom.If yours has a center keel that that would make 7 keels.
Get a tach and in the spring we'll get you straightened out.

 

[steelespike]

Re: 2012 50HP E-Tec on a Crestliner Storm 16

I was also looking at another site that does boat reviews and they tested a Crestliner 17`CW with about the same body style as my boat, and they hit 33MPH at 5400 RPM. This was with a 50 2-stroke Merc. This boat was almost double the weight of mine.

What size prop?
What is your speed and is it by gps?
A ss prop doesn't guarantee more speed but it could easily add 2 to 3 mph.
Aha, just noticed that is a Merc.It has a different gear ratio. May be faster but a little slower out of the hole perhaps more sinsitive to added weight. Generally run a slightly lower pitch for a similar application.

 

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Re: 2012 50HP E-Tec on a Crestliner Storm 16

My prop is a 13-1/2 x 15
The prop used in my last post just says it`s a 14" Vengenace
Also the test was with 2-people in the boat, min gear, and 1/2 tank. When I tested my boat it was just me in the boat, min gear, and 3/4 tank.

The speed of my boat is about 31-33MPG buy Speedo (depending on the level of chop on the water), by GPS it was 30-32MPH

 

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Re: 2012 50HP E-Tec on a Crestliner Storm 16

Ya pricing Tach`s now. But from what your saying I`m pretty much on par with other boats of similar design and build. Correct ?

I`ll check the number of Keels tonight, but my guess is it has 7.

 

[steelespike]

Re: 2012 50HP E-Tec on a Crestliner Storm 16

I found a picture and counted 6 keels not counting the center because I couldn't tell.
At 32 mph The prop calculator indicates your rpm could be over 6000. Thats using 32 mph and a 6% slip,a guess.
You should be able to pin down the speed more accurately with the gps.
In the spring with accurate rpm And careful gps reading we can tell better.
Its possible if your actually over 6,000 you might go to a 17" prop and lower the rpm yet gain some speed.

 

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Re: 2012 50HP E-Tec on a Crestliner Storm 16

Thanks for the help. I`ll touch base with this again in the spring.