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70 Yamaha 15' standard
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| huckelberry145 |
Posted on 02/13/13 - 9:03 AM
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I will soon be picking up my new 1999 70hp Yamaha for my 1996 15' standard. The seller is keeping the stainless prop so I will run the aluminum one he is giving me for now. Any suggestions on rigging and prop selection would be appreciated. Speed is not what I'm after, good handling in rough water is.
Thanks in advance, Bill
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| Tom W Clark |
Posted on 02/13/13 - 9:38 AM
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You want the 13-1/4" x 17" Stiletto Advantage 4.25 with a DE-500 hub kit.
Be sure to mount the motor as high as it can go on the transom, "three holes up"
o
o
o
o <-- Mounting bolts through this hole on motor's mounting bracket.
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| huckelberry145 |
Posted on 02/13/13 - 4:24 PM
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Thanks Tom, this 70 looks like it belongs on here. I work a lot and between working on this and the "girlfriend", I haven't had much time to post pictures. I'll get to it one day. I'm not very computer literate.
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| huckelberry145 |
Posted on 03/01/13 - 7:35 AM
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I finally ran the boat yesterday. I was told wrong on how to set the tach. Even though I tried every setting, I could not get it to read right so i don't know yet what wot was. I have the motor set three holes, all the way up with the Stiletto advantage 13 1/4 x 17 and was going about 40 mph according to my smart phone GPS. The boat pulled HARD!!! To starboard and would porpoise real bad when I got it into the wind. It was very windy yesterday and where I was is a protected channel with no current and no chop. It would run great though when i could get it out of the wind. I adjusted the engine tab and tach per instructions and going to try again today.
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| Bake |
Posted on 03/01/13 - 11:26 AM
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As you stated speed is not your top priority I would drop the motor one hole. I tried to raise mine to the maximum height and the only thing I got out of it was blowing the prop out in tight turns. At the time this was my primary boat for pulling the kids on water toys. I am sure I could have spent money on a prop that might have gotten better bite but in the end that one hole up is not going to give you much benefit on that boat. I moved my motor up and down. I changed my prop from 17 to 19 pitch. With all set ups I ran 42 mph wot. I do not even have a tach on my old 70 so I can not speak to rpm change. I just know my boat handles better with the motor set a little lower.
I will add that you are going to love that boat with a 70. I tell everyone it is like driving a corvette on the water. Sitting down on the water like that 42mph feel like 62mph. The 15 will come off a wave as soft as any other boat you have ever ridden in. The smirked hull will provide a very dry ride. I love my 15, I want to go out and give it a hug right now.
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| huckelberry145 |
Posted on 03/01/13 - 2:52 PM
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Bake, during my propeller endeavors today, I met a guy that offered me, well let me say more than I paid for the boat. We politely waved at the ramp and when we pulled away followed each other to the prop shop. Long story short he cant find the right prop for his flats boat and i can't get mine to quit proposing. He let me try his power tech stern lift prop and it ran flat and smooth, like it should. 34 mph at 6000 rpm. The only markings this thing has on it is scd3r13pym90. Looks like it might be a 13 pitch.
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| huckelberry145 |
Posted on 03/01/13 - 3:12 PM
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Continued.... I got the prop at an excellent price. But I didn't sell the boat lol. I'll go by the next time I get some time off work and trade this stiletto 13 1/4 x 15p for a 13p and see if that doesn't do the same thing. All I know is with my friend in the boat with me today with that 17p prop it porpoised so bad it almost threw us out and I'm not exaggerating. He had to go to work so when i tested the power tech I was by myself. I hope it does the same , run right, when i have my gf or dad in it. The hull doesn't have a hook or anything like that so I don't know what the problem is that makes it porpoise so badly. I have looked at pictures of other 15s on here and mine is set up basically the same. The boat sits in the water with both splash well drains out of the water and level. I don't know.
P.s., I only weigh 185 so it ain't me lol.
Edited by huckelberry145 on 03/01/13 - 3:41 PM |
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| Bake |
Posted on 03/01/13 - 8:40 PM
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13 pitch 6000 rpm. I do not think that is going to be good for your motor. Off the top of my head 5500 to 5800 should be max.
I am sure I will be corrected but I did not take the time to Google it.
It is just my opinion but I think you will be happier if you drop the motor and get back up to the 17 pitch prop.
.
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| huckelberry145 |
Posted on 03/01/13 - 10:23 PM
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Thanks Bake, I'll give that a try Monday.
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| Tom W Clark |
Posted on 03/02/13 - 8:11 AM
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The 1999 Yamaha 70 HP two stroke has a 5000-6000 RM range and a 2.33:1 gear ratio.
I am confused about a number of things.
I have the motor set three holes, all the way up...
So the mounting bolts are going through the lowest set of hole in the motor, like this?
o
o
o
o <-- Bolts through this hole, motor mounted All The Way Up
...was going about 40 mph according to my smart phone GPS
Are you sure your phone is using GPS and not antenna triangulation to determine speed? There can be a big difference between the two and 40 seems too slow to me, so maybe there is a measuring error.
The boat pulled HARD!!!
Again, I find that very odd. Usually when you have a motor mounted high, it makes the steering effort light. A motor mounted too low will often produce a lot of steering "pull".
Also, does it really pull? Or is it just hard to turn one direction? In 1996 Whaler would have been using a Teleflex NFB steering system so it should NOT be pulling at all. Please clarify.
How did the pull change as you trimmed the motor all the way out at WOT?
A PowerTech! SCD3R13PYM90 propeller is their version of the Yamaha Painted Stainless Steel model. It is a semi-cleaver design. This one would be 13" x 13" with a press-in rubber hub for Yamaha. 13" pitch is way too short for your boat.
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| dgoodhue |
Posted on 03/02/13 - 10:59 AM
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As for the porpoising, how is the motor trimmed? The only time my 15' porpoises is when I have it trimmed out for top speed and I slow down & leave it trimmed to far out.
The wind will affect the performance of the boat. A little bit of head wind actually seems to help my top speed when i have passengers. If have too much head wind it will raises my hull to much out of the water that induces uncontrollable chine walking at much earlier speeds.
Dave |
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| Bake |
Posted on 03/02/13 - 1:00 PM
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To the point that the prop can not cause porpoising. He is going much slower with the 13 pitch. That in itself will help the boat ride smoother because its down in the water.
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| huckelberry145 |
Posted on 03/02/13 - 8:32 PM
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Good evening all, and thank y'all for all of your questions and comments, I really think I'm going to get to the bottom of this soon with all of y'alls help. Tom, I have the motor set all the way up, as high as it will go. Also I am using speed view GPS on my phone and if I would have let go of the wheel, me and the boat would have been into the rocks in .5 second. I mean it pulls HARD!!! The tab is not corroded in any way nor was it adjusted any, so I adjusted it a little and that helped some. As soon as I get a chance, I'm going to drop the motor 1 hole down and go back to the stiletto prop like bake suggests.
Again, I can't thank you all enough.
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| Derwd24 |
Posted on 03/02/13 - 11:02 PM
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You said that the boat pulls hard to stbd, did you move the trailing end of the tab to stbd when looking at it from behind the motor to compensate for the pull?
Edited by Derwd24 on 03/02/13 - 11:04 PM
Dave - 1983 Outrage 22 |
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| huckelberry145 |
Posted on 03/03/13 - 6:11 AM
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Derwd24, I'm out of town and cant look at it bot I'm 99% sure I moved it, the trailing edge to starboard.
Thanks, Bill
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| Binkie |
Posted on 03/03/13 - 7:31 AM
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You say your boat is a standard model. Are you using a tiller outboard. If so, that may answer some of these confusing questions and answers.
rich
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| huckelberry145 |
Posted on 03/03/13 - 11:54 AM
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Nice sweeeet13 binkie. My 15' standard has a side console just like a striper model but set up with thwart seats like a sport model. Look at the whaler models section under 15' standard and that one is my boat.
Thanks
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| Joe Kriz |
Posted on 03/03/13 - 12:13 PM
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Here is Bill's (huckelberry145) 15' Standard.
http://www.whalercentral.com/userphot...oto_id=132
For some reason, for 1996 and 1997, the 15' models only came with the name of Standard 15'.
These Standard models had the option of the side console and thwart seats but Boston Whaler did not call that a Sport model like they did in the earlier days.
Just one of those stranger things they did back then?
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| Tom W Clark |
Posted on 03/03/13 - 1:24 PM
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Joe is correct, the Standard name in the 1990s meant something a little different from the 1960s and 1970s.
The 15 Standard was available with, or without, remote steering. Obviously Bill's boat is remote because he is describes his steering wheel.
If the motor is pulling to starboard, we know two things:
The steering is non-NFB. This is odd, because the Standard's optional steering was explicitly Teleflex No Feedback (NFB) so while it might be very hard to turn the motor one direction, the wheel would not move if you let go. Somebody must have installed a non NFB system in your boat at some pint.
If the motor is pulling to Starboard, the motor is trimmed in. You didn't answer my question about how the pull changed as you trimmed the motor out. A (standard rotation) motor tucked in will pull to Starboard. When trimmed out, it will pull to Port. The trim tab should be adjusted for neutral steering at the speed and motor trim angle you must commonly cruise at.
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| huckelberry145 |
Posted on 03/03/13 - 1:39 PM
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If the motor is pulling to Starboard, the motor is trimmed in. You didn't answer my question about how the pull changed as you trimmed the motor out. A (standard rotation) motor tucked in will pull to Starboard. When trimmed out, it will pull to Port. The trim tab should be adjusted for neutral steering at the speed and motor trim angle you must commonly cruise at.
Tom, when I trimmed the motor up it porpoised so violently and pulled to starboard I think a little less. I know it still did but it's hard to judge how much when you think I think I'm about to get thrown out.
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