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2007 Johnson 15hp 2stroke prop help (Read 3771 times)
jtaylor
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2007 Johnson 15hp 2stroke prop help
Mar 18th, 2010 at 4:23pm
 
My boat is turning about 6100 rpm w/ me and a fishing buddy on the tiny tac.  Right now I am running a 10x11 piranha composite prop. I would like to go to 9 1/4 x 12 alum and see where that takes me.  I have tried a 10 x 13 and that was too much prop (4900rpm). I can't find any alum props pitched more that 11 for my motor.  Where should I look and is a 9 1/4 x 12 sound about right?  Also I would like to go to ss prop but what to make sure the size/pitch is right before I drop that kind of money in a prop.   Thanks
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DuckNut
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Re: 2007 Johnson 15hp 2stroke prop help
Reply #1 - Mar 18th, 2010 at 5:15pm
 
Take your aluminum prop to a prop shop and for about $65 they can make it anything you want it to be.  After you get it right go to evilbay buy another for $20 and have a spare made.
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jtaylor
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Re: 2007 Johnson 15hp 2stroke prop help
Reply #2 - Mar 31st, 2010 at 10:48am
 
We dont have a prop shop here. I fish in small rivers in south east georgia and in the summer they get very shallow and you hit alot of stuff. The tech at the boat shop here told me I shouldn't run a stainless prop because i would likley damage the lower unit. Are the hubs in props for smaller boats not designed to spin before lower unit damage? I am trying to decide between ss and alum. Thanks
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whitesnooky
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Re: 2007 Johnson 15hp 2stroke prop help
Reply #3 - Mar 31st, 2010 at 12:43pm
 
U know composite propeller spins faster than aluminum propeller because of the weight and flexibility?

Say u have 10x11p composite propeller spins at 6100 rpm.

If u get a aluminum propeller 10 x 11p and u will be looking at 5500 rpm average.

I'm thinking 9.25 x 12p aluminum will spin about the same.

10 x 13p aluminum = 4900 RPM as you stated.

10 x 12P = 5200 RPM

10 x 11p = 5400 RPM

9.25 x 11p = 5700 RPM

9.25 x 12P = 5500 RPM

That's the best guessimate by increase 1" pitch will lost 200 RPM or decrease 1" pitch will gain 200 RPM.

My 2 cents...
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southboundchicken
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Re: 2007 Johnson 15hp 2stroke prop help
Reply #4 - Apr 1st, 2010 at 7:35am
 
i do know one thing  Huh i have busted up many a aluminum prop but never busted a lower unit using a ss prop and i've hit more stuff than the average guy Wink
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jtaylor
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Re: 2007 Johnson 15hp 2stroke prop help
Reply #5 - Apr 1st, 2010 at 8:34am
 
Thats kinda what I was thinkin.  I think I'm gonna go with powertechs class a srt3 9.5 X 11. Anybody got any sugestions on where to order it from?
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whitesnooky
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Re: 2007 Johnson 15hp 2stroke prop help
Reply #6 - Apr 1st, 2010 at 8:47am
 
jtaylor wrote on Apr 1st, 2010 at 8:34am:
Thats kinda what I was thinkin.  I think I'm gonna go with powertechs class a srt3 9.5 X 11. Anybody got any sugestions on where to order it from?



Call Ron at theskiffshop.com

The 11" pitch SRT model sounds deep......

Get a 10" pitch stainless steel if u get a SRT model....trust me on this.

I ordered a 9.25 x 10" pitch SRT S.S propeller with no cup for my merc 15hp 2-stroke.

I should have went to 9.25 x 9" pitch with cup but it'll be fine.
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Maurice
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Re: 2007 Johnson 15hp 2stroke prop help
Reply #7 - Apr 2nd, 2010 at 1:27pm
 
I have a SWA3 10" on my 9.9 Evinrude and it runs great!
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ECC Gladesmen

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whitesnooky
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Re: 2007 Johnson 15hp 2stroke prop help
Reply #8 - Apr 2nd, 2010 at 3:00pm
 
Maurice wrote on Apr 2nd, 2010 at 1:27pm:
I have a SWA3 10" on my 9.9 Evinrude and it runs great!


SWA has a smaller blade which is spin faster than SRT model.  SRT model has little bit wider blade than swa model.
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Maurice
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Re: 2007 Johnson 15hp 2stroke prop help
Reply #9 - Apr 2nd, 2010 at 3:38pm
 
whitesnooky wrote on Apr 2nd, 2010 at 3:00pm:
Maurice wrote on Apr 2nd, 2010 at 1:27pm:
I have a SWA3 10" on my 9.9 Evinrude and it runs great!


SWA has a smaller blade which is spin faster than SRT model.  SRT model has little bit wider blade than swa model.


Wasn't sure what the actual difference was, thought it might be cup in the blades.
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ECC Gladesmen

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- Lefty Kreh -
 
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whitesnooky
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Re: 2007 Johnson 15hp 2stroke prop help
Reply #10 - Apr 2nd, 2010 at 7:54pm
 
The SRT model has wider far blades for designed heavy load and 4-stroke engine

...

The SWA model has a smaller blade design for high speed  light load application.

...


Look closer and you will see the difference of the propeller Wink
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Maurice
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Re: 2007 Johnson 15hp 2stroke prop help
Reply #11 - Apr 6th, 2010 at 11:31am
 
Cool!  I just need a few more ponies to get the MPH up! Grin
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ECC Gladesmen

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- Lefty Kreh -
 
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whitesnooky
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Re: 2007 Johnson 15hp 2stroke prop help
Reply #12 - Apr 6th, 2010 at 12:16pm
 
Maurice wrote on Apr 6th, 2010 at 11:31am:
Cool!  I just need a few more ponies to get the MPH up! Grin



What's the max RPM are u running?

Tune your 9.9hp to 15hp by swap bigger carb.....
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Maurice
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Re: 2007 Johnson 15hp 2stroke prop help
Reply #13 - Apr 6th, 2010 at 1:05pm
 
whitesnooky wrote on Apr 6th, 2010 at 12:16pm:
Maurice wrote on Apr 6th, 2010 at 11:31am:
Cool!  I just need a few more ponies to get the MPH up! Grin



What's the max RPM are u running?

Tune your 9.9hp to 15hp by swap bigger carb.....


Don't have a clue what RPM but it sounds and feels wound out good with the 10 pitch.  I like the holeshot so don't think more pitch without more HP is going to fix my issues.  The boat performs great just runs out of juice on top.  I'm used to the power of a 25HP but don't think that would be a good idea on the Gladesmen!!! 
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ECC Gladesmen

"there is no disadvantage in being able to cast far"
- Lefty Kreh -
 
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