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Posts: 574
| Can't read the #s on my prop so that makes getting a replacement a little tricky......
Hopefully someones got the same boat, or close and can give me an idea what pitch I'll need..
Boats a 97 Alumacraft Tournament Pro 175, with a Honda 75 hp tiller
Anyone?
Thanks |
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Posts: 138
Location: Aurora IL | go to philspropshop.com and use prop wizard. it will tell you exactly what you should be running. good fishing, Bill |
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Posts: 3504
Location: Elk River, Minnesota | Hiya,
Chances are with that size motor on that size boat, you are looking at a diameter of 13" to 13.5" and a pitch of around 15" with an outside chance at a 17" pitch.
That is a big boat for a 75 tiller so I would tend to believe the 15 pitch is going to be fairly close to being the ticket.
Steve |
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Posts: 272
| I would agree with VMS. With that "small" an outboard, you're going to be on the smaller end of the pitch range or you're never going to wind that engine out.
My 1775 TP has a 115, and that's about the smallest you generally see. I don't think its underpowered, but its definitely not over powered. Occasionally you'll see a 90. Can't say I've ever seen a 75hp tiller on a big 18' boat. I'd post you my prop/pitch, but its not going to do you much good with 40hp between us. Boat is also an '02.
Good luck....what'd you do to your prop? |
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Posts: 574
| I went to Phils prop shop,(in the link) they had my actual boat in their system... year, model, etc...
They recomend a 21 or 19 pitch... Now I'm a bit confused... "21 for top speed......19 for heavy loads, or water sports"
VMS..... Typicaly you seem to know what your talking about prop wise.... Thoughts?
The 97 is smaller and lighter than the current TP alumacrafts... The newer ones are 96 wide, mine is 88.
Were you thinking more along the lines of a 1400lb newer TP, or do you think the 15-17 is still probably right for my closer - 1000lb boat...
I'm gonna put it in the water today and see what my rpms are at, then bring the prop in somewhere to figure out the actual pitch...
Edited by Jason Bomber 4/21/2011 8:33 AM
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Posts: 574
| muskie-addict - 4/21/2011 7:28 AM
My 1775 TP has a 115, and that's about the smallest you generally see. I don't think its underpowered, but its definitely not over powered. Occasionally you'll see a 90. Can't say I've ever seen a 75hp tiller on a big 18' boat. I'd post you my prop/pitch, but its not going to do you much good with 40hp between us. Boat is also an '02.
Good luck....what'd you do to your prop?
Just got the boat over winter... Prop came pretty beat up, so I'm just trying to get a SS and use the beat up aluminum as a backup... |
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Posts: 3504
Location: Elk River, Minnesota | Hiya,
In doing a bit of research on the 97 tournament pro, it comes in at a weight of 990 pounds....just a tad above of my alumacraft Navigator 165 which is 960. Given there is a solid chance you have an on-board gas tank of roughly 20 gallons or so (I could not find this info..., but threw out a number just to have something to work with) and 3 people in the boat and 200 pounds of gear (like a bow mount motor and batteries), I figured the motor to be pushing pretty hard. so...I threw out the recommendation of 17 pitch to maybe a 15 pitch depending on load.
Now...one thing I didn't do was look at the gear ratio of your motor....which is 2.33:1. So...you can get away with a little more pitch since most midrange 4 stroke engines have a 2.0:1 gear ratio. With that in mind, I would say the 17 is pretty close for your rig. I think if you went 19, it would really be pushing hard to get out of the water if you have any kind of load in it.
When choosing your prop, there will always be a compromise of some sort. Go for speed, and you lose hole shot. Go for holeshot and more than likely you lose a little top-end speed. The biggest thing to consider is how you will load the boat and how many people you will have with you at any given time. The best thing you can do is load the boat as you normally would, and go test it and see how it performs... If it is a dog...go lower in pitch. If it pops up really quick and over-revs at full throttle, go up in pitch. This is a bit of tongue-in-cheek here, assuming you are looking to stay with a stock aluminum prop. If you start looking at aftermarket products, a huge array of options are there due to prop design, blade thickness, vent holes, cupping, etc... many more variables to play around with, but a bunch of fun if you enjoy tinkering and have the extra cash to spend on different brands and styles of props. Some people will find a demo program through a dealer to test various styles of props, then purchase from there.
Without actually running the boat, though, it will be hard to dial in a good prop, but I would say 17 pitch is a good starting point. I also like the fact you are going to take the prop to a shop to figure it out. They will be able to lay it on a template and get the pitch for you... My gut says 17...
I did not take into account the boat being that much lighter when I considered my first statement, so you were right on. For that I thank you for responding...
Good luck and enjoy!!
Edited by VMS 4/21/2011 1:53 PM
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Posts: 255
| I have a Tournament Pro 185 tiller with a 90hp ETEC. I went through numerous prop shops that I thought were very knowledgeable. Until I got to John at DAH propellers in Burlington, WI John was extremely knowledgeable and got me what I was looking for. I wanted more speed and get on plane faster. He was great. Not the cheapest but, in my opinion better than any other guys I had spoken to. His site is www.dahpropellers.com. 262-534-4440 I hope it is O.K. to post his site here.
VMS gave me a lot of help back when I started my prop quest as well. You can't go wrong with his help too.
Hope this helps,
Tom
Edited by Musky53 4/21/2011 1:39 PM
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Posts: 7
| VMS, I also have a Navigator 165. I run a 75 Yamaha Tiller with a 15 pitch. What kind of pitch do you have on your motor? |
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Posts: 574
| Tried it and brought it in to get the pitch figured out...
Its a beat up 13 x 19..... and I got just under 5100 rpm... Rating for the motor is 5000-6000
He said I'll probably want a 17, but the only SS 1 he had was a 13 x 18..
At least I can try it and decide what I'll really need..
Thanks Steve & others...... |
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Posts: 3504
Location: Elk River, Minnesota | Hiya,
If you were not even getting 5100, you might find a 17 pitch to be a bit on the low side as well. The 13 x 18 steel will probably give you about the same numbers as your 13 x 19, but could be potentially less since it is a steel prop rather than an aluminum.
Roughly you can count on every inch in pitch of prop will equate to around 175 - 200 RPMs, so going to a 17 would get you to about 5500, a 15 would get you close to 6000 which would be the ideal situation.
Depending on how much you want to spend, you could try a 15 or a 17 pitch ballistic propeller on there which is designed to give excellent bow lift and great handling. you might even be able to move the motor up a hole or two on the transom to get even more RPMs without too much loss of handling.
My 165 Navigator has a 90 hp yamaha 2 stroke that has had a couple of aftermarket items placed on it to get higher top end. I am running a 17 pitch ballistic propeller on mine, getting 5400 RPM on a low humidity comfortable temp day. When it gets hot and muggy, it bogs down and only pulls about 5300, but that is due to conditions, yet is still in the upper 1/3 of the RPM range which is ideal.
Steve
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Posts: 574
| Sooo, 3 guys and we got 5400 rpm with the 18p SS prop.. Found a Honda SS 16 pitch prop on Ebay for a a good price and bought it..
Seemed like that would be the closest since I couldnt decide between a 15 and 17.....
Didnt really think I'd find a 16...
Thanks again for the help VMS.........
Edited by Jason Bomber 4/26/2011 7:37 AM
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