Guests - If You want access to member only forums on HSO. You will gain access only when you Sign-in or Sign-Up on HotSpotOutdoors.

It's easy - LOOK UPPER right menu.

Sign in to follow this  
Followers 0
Deep_Sinker

Props for 115 Yamaha 4-stroke?

14 posts in this topic

I'm looking for suggestions on prop choice for my Yamaha. I wasn't impressed with the over-revving of the stock 17 pitch aluminum prop, so I bought a 19 pitch stainless. The 19 lowered my RPMs by 1100 at WOT but didn't notice any speed gains and have a much slower hole shot. I am hoping to find a prop that doesn't rev out and would still be able to pop a skier out the water. Does such a prop exist? Any other suggestions?

Share this post


Link to post
Share on other sites

Maybe a 17P 4-blade?

What RPM's were you getting at WOT with these two props?

Share this post


Link to post
Share on other sites

What RPM's were you getting at WOT with these two props?

The information LMITOUT asks for above is information that's needed prior to any propping questions can be answered. Also, the RPM at WOT should be when you've got the boat running trimmed up to the optimum running position.

marine_man

Share this post


Link to post
Share on other sites

It's a tough motor to find the right stainless for. I tried several and gave up, went to the standard Yamaha 19P aluminum.

Northlander has this motor and he has a couple SS props he swaps out pending on what he's looking for.

Try Soderblooms and see what they have in mind for your specific hull.

Share this post


Link to post
Share on other sites

Maybe a 17P 4-blade?

What RPM's were you getting at WOT with these two props?

17P Alum hit the rev limiter at 6000

19P SS gets 4900 at WOT

Both get similar top end (39mph gps).

The SS was bought from Jay. He thought SS would lower RPM to 5600 and increase top end...

Boat is a 1700 Fisherman.

Share this post


Link to post
Share on other sites

I'd work with Jay and look at a 17P steel, that was what got me closest to the combo of speed and hole shot with decent RPMs.

Another option is the 19P alum, it works for me on almost the same lund hull.

Share this post


Link to post
Share on other sites

I was thinking raising the motor might help, but then again that will probably mess with your hole-shot. I'd try a 17P 4-blade. That'll get you hole shot and probably less RPM's. That motor should run between 5-6000 RPM's when lightly loaded and right in the middle would probably be ideal.

Share this post


Link to post
Share on other sites

17P Alum hit the rev limiter at 6000

Top end on RPM for that motor is 6k... were you going past, or are your sure you were hitting the rev limiter?

Your best best is to go with a 17 stainless 3 blade or the 4 blade as LMITOUT said.

marine_man

Share this post


Link to post
Share on other sites

Your best best is to go with a 17 stainless 3 blade

I agree. Not surprised your rpms and holeshot dropped so much going from 17 alum to 19 stainless --- you're bringing a lot of variables into play there. A 17 stainless or a 19 alum are probably going to give you better performance than the 19 stainless.

Share this post


Link to post
Share on other sites

Deep sinker send me a e-mail and you can come try some of my props out. I have a stainless that Jay cupped, holes and tweeked up a bit and I get 45 with a light load and hole shot and cornering is great. Average with full load and 2 guys is 40mph. Ill be around all weekend and we can test them out if ya like.

Share this post


Link to post
Share on other sites

Top end on RPM for that motor is 6k... were you going past, or are your sure you were hitting the rev limiter?

marine_man

6k is the rev limit. Motor would run up to and cut out.

Northlander, you have mail.

Share this post


Link to post
Share on other sites

6K is the top of the RPM spec.. I wonder if there's some variance in your Tach and you were running beyond 6k even though the tach didn't show it.

You should be able to run right up to (but not much over) 6k.

marine_man

Share this post


Link to post
Share on other sites

I have a similar set up as you deep sinker. 1800 fisherman with Johnson 2 stroke 115. It came with a 17 p 14 dia prop and @ WOT it was 5700 rmp. I did not have a spare so I replaced it with a 17 p 13 1/4 dia hustler aluminum and that gave a WOT @ 5400. I though with a smaller diameter prop I would gain rpm's but this one must be cupped differently. Now I get 39 mph (gps) and a hole shot that should have no prob popping a skier up.

Hope this helps. I know you have a 4 stroke so we may be talking apples and oranges?

Share this post


Link to post
Share on other sites

The gear ratio is most likely different too.

Share this post


Link to post
Share on other sites
Guest
This topic is now closed to further replies.
Sign in to follow this  
Followers 0



  • Posts

    • Actually the guy at ace was pretty close. These little guys are for framing steel studs before sheetrocking,  but yes they also could be for sheet metal work even though they are black . But your right hawg sharp and go in fast. 
    • What  a sweet find !!   Even better that you had a camera handy !!
    • Great trade and as of last year I know I wasn't ready to part with Lavine and his potential but that all changed when he went down with the injury.  I hope Lavine becomes a stud for Chicago in a few years but our time to win is now with this addition!!  Great move giving up hope for a top 15 player in the league that plays D is brilliant with the young studs we still have on roster.  Now all we need to do is add another player or 2 in free agency to strengthen our bench and we will be looking good.  Excited for the free agency to start!!! Playoffs here we come!!!!!! GO WOLVES!!!!!!!!!!!
    • http://minnesota.cbslocal.com/2017/06/22/mall-of-america-slips/   Classic case of doctors juicing up a medical claim with a series of failed therapies, creating a life long patient and a corporation with deep pockets to bill for those services.  Think not?  Dont be so naive.  Nobody wanted to fix her, they just wanted to keep billing, sad deal that happens all too often.          
    • That Drouin contract at 5.5 is kind of bad for us right now. Nino is far more proven than him and Granlund has had the beast season out of the 3 of them. Hard to see anything under 5 for each of them. 
    • Looks like the Wild moved Schroeder for....another Schroeder.  Maybe the new guy will be more consistent.   I see Evander Kane is on the trade market.  On the expensive side, but if the Wild decide to move Scandella instead of Dumba, that would free up more money.  A guy capable of scoring 30+ goals with some size would be sweet.     I am thinking Granlund and Nino each sign for in between 4-5$ mil each.  Hopefully less and hopefully Pominville will restructure a little.  Doesn't leave a ton of cap space for free agents or other guys.     Lots of moving parts in Chicago.  They seem to be moving a lot of parts around to try to work with their cap situation.  
    • I think you, or the person at Ace, meant "Sheet metal". That's what they're used for....sheet metal and HVAC work. They have a self-tapping thread. Look on your furnace where the sheet-metal ducting is fastened...bingo!   Also called "sheet metal screws".  Hope they work for ya!  
    • Reminds me of a memorable morning at our place when  THREE male's landed on a front picture window ledge and just sat there for a few minutes looking in.  What a glorious sight!  They were likely just moving through because we do not see them during a normal summer. In fact this summer we have noticed a decline in many species; no bluebirds at all, only a couple doves, fewer swallows, not as many wrens (but still plenty of them) and for the first time a pair of cowbirds. Normal mornings are like a symphony around here just about daybreak.
    • forgot I made this post, I fished a lake here in SD last weekend that has a sunken road way and bridge completely submerged. Its gotten to the point the concrete has fallen apart under water but you can still see most of the structure in tact but also some rebar etc.   I wanted to get a screen capture but as usual that exact spot was popular and already occupied with other boats playing bumper boats to anchor and fish near and I didn't want to intrude on their fishing space just for a picture. 
  • Our Sponsors