Go figure this out

You know the drill..

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smltooner
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Location: Smith Mountain Lake, Virginia

Go figure this out

#1 Post by smltooner » Sun May 28, 2017 7:34 pm

We have a 2007 Suntracker w/ Merc 60 Bigfoot that we bought new.
For the last 9 yrs., the best this setup would run was 5,000 rpms and 15 mph.
Took it out yesterday, for the first time this year, and am running 17mph@6,000rpms.
This was under normal conditions with 2 adults and 1/2 tank of gas.
The boat has been hanging in the lift since last October and has not been touched.
I think I'll hang it back until next year and maybe hit 20mph.
LOL....all this is true, but I'm not really hanging it up for a year.
SMLTOONER
Ted & Emily
2019 Bennington 21SL Tri-toon
2019 Yamaha 150 HP
Smith Mtn. Lake, Virginia

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joe20toon
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Location: Central Florida

Re: Go figure this out

#2 Post by joe20toon » Sun May 28, 2017 7:54 pm

This sure is an amazing election year !!!
You've gotta be happy !
2016 20 foot Sylvan RPT (V Pontoons)
Yamaha Vmax SHO 115HP
80 Pound Thrust RipTide Trolling Motor
Humminbird Helix 7 Side Imaging

boocat
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Location: Texas Hill Country

Re: Go figure this out

#3 Post by boocat » Mon May 29, 2017 6:36 am

somebody wanted your prop so they sneeked in and changed it out so you wouldnt notice right away.

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joe20toon
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Re: Go figure this out

#4 Post by joe20toon » Mon May 29, 2017 6:41 am

The prop changing theory is good too!
2016 20 foot Sylvan RPT (V Pontoons)
Yamaha Vmax SHO 115HP
80 Pound Thrust RipTide Trolling Motor
Humminbird Helix 7 Side Imaging

urbnsr
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Location: Celina, Ohio

Re: Go figure this out

#5 Post by urbnsr » Mon May 29, 2017 6:57 am

We started out last year, in cooler spring temps (cooler than summer, anyways), running ~5750RPM and maybe 21MPH with our 70HP 2 stroke. At some point during last summer, WOT was no more than 5250RPM and 20MPH. I assumed it was growth on the bottom of the toons as I was 'warned' about this (from a shop that cleans tunes). Life went on...

Then last fall, without any cleaning of the toons, our RPM increased and back to 21 MPH max.

I now believe the air temperature was the reason for the changes. I can't think of anything else to cause this. If so, would this show up more on a 2 stroke compared to a 4 stroke? I dunno.
Paul

Bamaman
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Re: Go figure this out

#6 Post by Bamaman » Mon May 29, 2017 8:03 am

There's more oxygen in colder air than hot air. Boats are usually faster in Spring and Fall than in the heat of the Summer. A couple of mph difference may be normal.
'12 Bennington 24' SSLX Yamaha 150

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smltooner
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Re: Go figure this out

#7 Post by smltooner » Mon May 29, 2017 3:07 pm

The temp was 84, so I consider that a summer time temp.
I like the prop thief theory.
SMLTOONER
Ted & Emily
2019 Bennington 21SL Tri-toon
2019 Yamaha 150 HP
Smith Mtn. Lake, Virginia

crspang
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Location: Lexington, SC

Re: Go figure this out

#8 Post by crspang » Mon May 29, 2017 5:45 pm

Strong tailwind?

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Strake
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Location: Smith Mountain Lake, VA

Re: Go figure this out

#9 Post by Strake » Mon May 29, 2017 6:54 pm

Ted,

I'm going with the OLD FUEL theory !

We had our toon our on the lake yesterday, and again today for a few hours. Noted to friends, that I'm still running on last November's last fuel up. Have put on about 12 hours of use since last filling up in November. Our tank holds 52 gallons so I'll be getting fresh fuel next time out or so.......

Richard
"Strake"
Richard and Angie
Smith Mountain Lake, VA
2015 Berkshire 233 RFX STS
Yamaha F200 LB

BobL
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Location: Louisiana

Re: Go figure this out

#10 Post by BobL » Tue May 30, 2017 6:48 am

What about the clean toons theory? All the gunk/crud/growth dried up and fell off during winter lay up.
SOLD - 2009 20' Bentley w/4 Stroke 90hp Mercury
SOLD - 2011 SouthBay 522CR w/115 4 Stroke Mercury
2014 Xcursion 23RF XS package w/150 4 Stroke Mercury

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smltooner
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Location: Smith Mountain Lake, Virginia

Re: Go figure this out

#11 Post by smltooner » Tue May 30, 2017 6:29 pm

Strake.....how would OLD FUEL make it run better? I was running on last year's gas.

BobL.....when my 'toon is not being used it is hanging in the lift, so there is no growth, to speak of, on the logs. I do like the idea though.

crspang.....not much wind that day and it was consistently better no matter the direction.
SMLTOONER
Ted & Emily
2019 Bennington 21SL Tri-toon
2019 Yamaha 150 HP
Smith Mtn. Lake, Virginia

DWRAT
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Re: Go figure this out

#12 Post by DWRAT » Tue May 30, 2017 7:08 pm

If it truly gained 1,000 rpm's, I agree that someone had to change the prop.
Old gas would hurt RPM's
A tail wind would not gain rpm's more the 50-100.
2012 SouthBay 722CRO 115hp Merc 4-stroke. Edit, make that a 150hp Merc 4-stroke now.

Bryden24shp
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Re: Go figure this out

#13 Post by Bryden24shp » Wed May 31, 2017 1:55 am

I think its the EzFenders! They work magic...
Owner-EzFender Boat Products
Members, visit your discount page at:
http://www.ezfender.com/PontoonForums-M ... -Page.html

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Strake
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Re: Go figure this out

#14 Post by Strake » Thu Jun 01, 2017 6:10 pm

[quote="smltooner"]Strake.....how would OLD FUEL make it run better? I was running on last year's gas.[/quote]

only jesting.....
"Strake"
Richard and Angie
Smith Mountain Lake, VA
2015 Berkshire 233 RFX STS
Yamaha F200 LB

Scott1
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Re: Go figure this out

#15 Post by Scott1 » Sun Jun 11, 2017 6:22 am

It is well know in the boating industry that if your boat sits up high off the ground or water for a while, all your horsepower will start to settle to the bottom of your outdrive. Your first time taking the boat out, you will have more than normal horsepower at the prop. I don't think you will have much more left for your second time out, let us know.
2014 Bennington 2375 RCW with Verado 250 Pro and Simon Motorsports ECM upgrade to 325 HP
Tri Toon with ESP package

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