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Discussion Starter · #1 ·
13 footer 9.8 4 stroke Sting ray Jr ...

TSG JP Battery TM up front 2 170 pound people.. Want top Speed

Purchased 2 props already Do Not want to Buy 5 ... @ $70 bucks a pop !

Dave
 

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Dave, what does this mean in English??

GPS speed, RPM's, current prop dia/pitch, etc...

I'm sure someone here has some helpful input if they know a starting point of where you are at right now performance-wise.

That 9.8 should be an ideal little motor for a hi-sider.

-T
 

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What size of the propeller for 9.8 hatsu 4-stroke?
This one:



Notice the man in the lower part of pic

-T
 

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tohatsu 9.8 prop info;

http://www.tohatsu-nissan-parts.com/Propeller%20&%20Prop%20Hardware%20Chart.htm

best I can do without access to a performance shops database
 

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Did not know you were a wood carver Tom or are you just a little person?  [smiley=smilie-iamwithstupid.gif]
 

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Discussion Starter · #8 ·
I have run an 8.5 X 8.5

and am running an 8.5 X 7 but it looks cupped ....

When funds allow I will get a tach ...

but the 9.8 merc 2 stroke is a LOT faster

and the 15 HP merc 2 Stroke with the sting ray and the Capt. Ron prop is Freakin Scairy fast !!!

So Far I am NOT impressed by 4 Strokes !

But soon I will be testing an 8Hp Yamaha ... and I bet it will Stomp the 'Hatsu 9.8

dave
 

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9.8 hp is 9.8 hp, no matter whether it's 2 or 4 stroke or a wenkel.

Something isn't right with the combo, but you'll probably need to get a tach first. How fast is it pushing the boat?

-T
 

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I have run an 8.5 X 8.5

and am running an 8.5 X 7 but it looks cupped ....

When funds allow I will get a tach ...

but the 9.8 merc 2 stroke is a LOT faster
and the 15 HP merc 2 Stroke with the sting ray and the Capt. Ron prop is Freakin Scairy fast !!!

So Far I am NOT impressed by 4 Strokes !
But soon I will be testing an 8Hp Yamaha ... and I bet it will Stomp the 'Hatsu 9.8

   dave

I have to take that away from you!  There's nothing wrong with 4-stroke performance, 4-stroke runs same top speed as a 2-stroke but 4-stroke has more weight.

I have a 9.9hp (enchanced to 15hp motor) 2-stroke engine.....
I know the yamaha offer 9 X 11 J-1 propeller is terrible set-up because the blade are wider and fat like a solas prop so I switched to 9 x 10.5 J model pitch and I noticed this one has a thinner blade propeller like a black max propeller (the mercury brand) runs alot faster and more RPM than 9 x 11 pitch J-1 Model.

9 x 11 inch pitch J-1 model 5750 RPM fat solas blade design (yamaha brand)  24.3 MPH

9 x 10.5 inch J model 6050 RPM thinner more cupped blade design (yamaha brand) at 27.9 MPH. ;)

You just gotta find a right propeller for a 4-strokes!  U have to look very carefully on the blade design, not just because 4-strokes are dogs...no....you're wrong! ;D
 
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