New SS Prop... Got questions....

Well I finally broke down and bought a new SS prop for my motor. The aluminum prop I had was bent bad and I needed to either fix it or get a new one. So I opted for the new SS prop. The new prop fits fine but it is real real real close to the little rutter thing above the prop (wish I new what the name of that was). Do you think this is too close? Is yalls prop that close to it? There might be a couple millimeters there to spare...

Few specs just FYI:
Old prop 12 5/8 x 21 K aluminum yamaha prop
New Prop 13 1/4 x 20 SS yamaha prop

The old prop
http://i615.photobucket.com/albums/t...s/IMAG0227.jpg


The new prop
http://i615.photobucket.com/albums/t...s/IMAG0223.jpg


The new prop installed (see how close it is to touching?)
http://i615.photobucket.com/albums/t...s/IMAG0226.jpg

DoubleG

I think you got too big a prop ( dia) My 115 Yamaha that I used to have the prop was a 12.25 X 21 The prop on my new Yamaha 90 is a 12.25 X 19

Wow. That's cutting it close...You mighta went up in diameter and didn't need to. :confused:

I tried to tell you that you needed a 19P for that motor. I can't see your pictures but you need to return and swap it for a 19P.

I don't understand why you went down in pitch either. Several boat techs have told me when replacing aluminum props with SS to stay with the same size and pitch and that is what I have always done through the years.

Re reading your post I have come to the conclusion that your old prop was the wrong size and your new one sure is.

Well I looked at alot of props and called alot of prop shops and they all said to go with the same pitch that I had or real close to it. Yamaha makes a 18 and a 20 pitch SS prop. I didn't want to jump from 21 all the way to 18 so I compromised with the 20 pitch. Plus I found a steal of a deal on it. Also when I looked up the Solas 19 pitch prop like the one you got they said it was the same as the 20 pitch yamaha that I bought. So that made my decision a little easier. See info below.

3 13 1/4 19 L 3442-133-19 SOLAS 3 13 1/4 20 L MAR-GYT3B-L4-20 Yamaha

SBC - They only make the 12 5/8 in aluminum. Check out this sheet below. It shows the props that yamaha makes and the diameters.
http://www.yamaha-motor.com/outboard...20T50~F115.pdf

DoubleG

My bad DoubleG......I was thinking of my old Merc when I said 12.25 dia. Both of my Yamahas ran 13 inch props. The SOLAS that I have on the new 90 is 13 in. dia X19 pitch It works great, gets out of the hole quick. Thats 13 in. even.

Call RJ's Outboard and ask him what you need. He'll shoot you straight.

Ignernt way to post pics iffen you want an eggspurt opinion on the matter. Pffft.

Wannabe...

I just called yamaha. They said that the prop did not have to clear the trim tab by much at all. That as long as it cleared it, then it was fine. He said that when the prop is in use, it is pushed toward the boat which would make it further away from the trim tab. Also, when in reverse it is not pulling it very hard so it would be fine.

I still might look into replacing the trim tab with one that is smaller to get more clearance. It still gives off a certain pucker factor.

If I read correctly, you can bring a prop to a prop shop and they can adjust it down or up a pitch if needed.. So if the 20 is too much then I could dial it down to a 19 if need be... Yamaha is also sending me a free tacometer to put on my boat since I don't have one so I can make sure I don't get over 6000 RPM.

DoubleG

Don't worry Double, if you open her up and it doesn't clear, I figure if the first blade doesn't shave that trim tab enough, the second one will and the third will just polish it shiney.

Wannabe...

Haha.. Yeah... I just did some searching online and found where some have trimmed there trim tab themselves just to get more clearance. I know if it does touch the trim tab will be gone. That darn SS prop is not going anywhere.

DoubleG

Quote:

---

Originally Posted by DoubleGobble00

I just called yamaha. They said that the prop did not have to clear the trim tab by much at all. That as long as it cleared it, then it was fine. He said that when the prop is in use, it is pushed toward the boat which would make it further away from the trim tab. Also, when in reverse it is not pulling it very hard so it would be fine.

I still might look into replacing the trim tab with one that is smaller to get more clearance. It still gives off a certain pucker factor.

If I read correctly, you can bring a prop to a prop shop and they can adjust it down or up a pitch if needed.. So if the 20 is too much then I could dial it down to a 19 if need be... Yamaha is also sending me a free tacometer to put on my boat since I don't have one so I can make sure I don't get over 6000 RPM.

DoubleG

---

SInce I know nothing about props, I'll need to jack this thread....cuz I do KNOW about that! Rofl

Taco meter? I think DD needs one of those before he hits the Messican joint next time!!! ;) Sorry just had to!!! :(

Take it to Art Payne and let him check it out. It could be off pitch. It might be a c- rather than a c sharp. Seriouly.

You should have a noticeable hole shot difference and you prolly won't lose anything on the top end cause the stainless ain't gonna flex. With this being said, I don't remember what motor you got, but I run a 21 on my 115.

I hate to call Art since I didn't get the prop from him. When I talked to art in the past he said that he would buy the same pitch prop I had on the boat which was a 21.

Minner - That is what I was shooting for... I got plenty of hole shot and speed when in my boat alone. When I got two people in there and full of gas the hole shot is slow but it will still get on plan and go good. I have to keep in mind the aluminum 21 prop does flex and it was bend really bad. So a non-bent prop and prop that won't flex should give me that little bit more emmmfffff by itself. Plus I stepped down to 20 which would give more power. I just thought the 18 would be too low. I guess we will see how it does. My motor is a yamaha F90. Below is the performance data for a boat close to mines size with the aluminum 21 prop on it.

http://www.g3boats.com/uploads/sites...170-F90TLR.pdf

DoubleG

Quote:

---

Originally Posted by DoubleGobble00

Haha.. Yeah... I just did some searching online and found where some have trimmed there trim tab themselves just to get more clearance. I know if it does touch the trim tab will be gone. That darn SS prop is not going anywhere.

DoubleG

---

Wouldn't be so sure about that there Double. Pretty much anything can booger stainless when it's turning 5500 rpms. That's some serious mph dood.

Wannabe...

What is the best way to figure out what size prop i need.I have a 60hp merc.

Talk with one or more prop shops that size em every day. It's part knowledge, part luck and part voodoo getting it right the first time.

Wannabe...

Quote:

---

Originally Posted by Wannabe...

Talk with one or more prop shops that size em every day. It's part knowledge, part luck and part voodoo getting it right the first time.

---

Thumbs Up Truer words have never been spoken. :) You hafta take into account EVERYTHING...boat type, weight, cargo/passenger weight, horsepower, power band and redline, purpose [pulling skier, top end, holeshot, etc.]. There are several calculators online to give you a rough guesstimate, but I'd hit the prop shop like Wannabe said, just to be sure.

Well I broke out the dremmel tool yesterday. I got a good 1/4 inch of clearance now. I am going to grind it a little more and round off the edges of the trim tab. My dremmel tool battery died on my yesterday. Hope to finish it tonight and I will post some pictures...

DoubleG

For a second there, I thought you were grinding on the prop....then I remembered, you're OOG, not ES.

Wannabe...

Quote:

---

Originally Posted by Wannabe...

For a second there, I thought you were grinding on the prop....then I remembered, you're OOG, not ES.

Wannabe...

---

or DD? Devil Icon

DD says if you grind too much off you can build it back up with duct tape

Yeah... Only one blade on the prop was close to touching... As you see in the picture... SS is not that hard to grind... I was surprised....

Quote:

---

Originally Posted by DoubleGobble00

Yeah... Only one blade on the prop was close to touching... As you see in the picture... SS is not that hard to grind... I was surprised....

---

Rofl LOL

Well I got more clearance now.... LOL. I took the dremmel tool to it yesterday. I got at least a 1/4 inch clearance now. That is much better than a 1/16 or less. We will see how it does this weekend...

http://i615.photobucket.com/albums/t...s/IMAG0230.jpg

DoubleG

Hope it performs good for ya.