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Post by chunk on Apr 6, 2015 4:57:49 GMT -6
Just wondering if anyone has a prop suggestion for my rig. Running a 2004 200 Optimax on a 2003 SV2100. Currently running a 21P three blade and full of fuel with three adults its hitting almost 6000 rpm. Thats a little much but don't know if it can handle stepping up another inch in pitch? Any suggestions?
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Post by Juan on Apr 6, 2015 5:49:15 GMT -6
What's the factory recommended rpm for your Optimax? 6,000 is just right for a Yamaha.
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Post by chunk on Apr 6, 2015 5:57:15 GMT -6
5750 rpm
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Post by Juan on Apr 6, 2015 6:11:07 GMT -6
An inch higher pitch should lower the rpms by around 200. Would that be about right?
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nlaudy
Petty Officer
Posts: 171
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Post by nlaudy on Apr 7, 2015 9:35:48 GMT -6
I know nothing about props but run a similar setup to yours. I have a 2002 SV2100 with a 2003 200 Optimax. I am running a 3 blade Rapture 14.25x19 RH prop. Not sure what all that means though
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Post by Juan on Apr 7, 2015 17:34:26 GMT -6
I know nothing about props but run a similar setup to yours. I have a 2002 SV2100 with a 2003 200 Optimax. I am running a 3 blade Rapture 14.25x19 RH prop. Not sure what all that means though 14.25 is your prop's size (diameter)... 19 is your prop's pitch and means that for every time your prop turns one revolution, your boat should move forward 19 inches. The RH means it's a right hand prop..(turns to the right)
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nlaudy
Petty Officer
Posts: 171
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Post by nlaudy on Apr 7, 2015 19:26:39 GMT -6
Thanks Juan!
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Post by Simple Man on Apr 11, 2015 10:35:32 GMT -6
Is your prop stainless? How old is it? It may have a lot of the cup beat out of it. That motor should not be turning that prop 6K on that boat. Consider having the prop recupped if it's stainless and has some age on it.
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Post by captfred on Jan 8, 2017 16:47:12 GMT -6
Hi! I'm new to the forum as well as the boating world. I own an 1993 Sea Pro 220 pushed by a 1994 200 HP 2 stroke Mariner. The motor is in perfect condition (compression/oil injection/carburation) as well as the transmission. Recently the propeller I bought the boat with had a close encounter with "something" and had missing pieces on the blades, but I was able to get it to the dock. It was an aluminum 14.5 X 19, 3 blade and I got consistently 30 kts by GPS (no speedometer). I went to a marine shop and I was advised to buy an aluminum 15 X 16, 4 blade prop which I did, but I definitely feel a drop in performance. Even running a light boat the most I could get out of it was like 25 knots. A couple days ago I took the boat offshore (quite heavy this time) with 3 to 5 seas and it was frustrating that I couldn't get more than 12 kts with the RPM approaching 6000 (needed to throttle back a couple times to allow it to grab better). Engine behavior was normal and temperature within limits (tell-tale stream healthy and steady). Mercury's website says that at my fully loaded weight (5,100 lbs) I can get about 40 mph. Does it sounds like a wrong propeller issue, or should I be looking for something else? Thx!
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Post by gnrphil on Jan 8, 2017 20:54:27 GMT -6
HI Fred and thwelcome31 . I'd expect you to see 40 mph with your setup easily, A few things could be holding you back, such as 1. incorrect prop 2. Motor not performing correctly 3. Motor mounting height too low 4. Hull condition. I think you'll be needing a 17 pitch prop assuming everything is working as it should.
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Post by captfred on Jan 9, 2017 20:33:11 GMT -6
Hi Admiral! Thx for your fast reply! I don't know much about 2 cycle motors, just the basics, but I have no reason to believe mine is not working correctly. It starts immediately after choke application (I've tried without choke and it starts, but after several cycles), all cylinders close to 115, no unusual roughness, some smoking, good "peeing", no overheating, restarts in a fraction of a second, a couple month old spark plugs look like new (not that many hours on them though), all 6 coils sparks are actually "scary" (got a hit from one). I measured the height of the motor, and the center of the propeller is about 8 inches below the lowest part of the hull (my waterline is about 15 inches above this point). The anti ventilation plate seems aligned to the bottom of the hull. I can say that my hull is in pristine condition, maybe in need of a polish for "aesthetics", but it is very smooth (no battle scars...ha ha ha!). Maybe I'm running the wrong prop. Today I bought on eBay a 3 blade 14.5 X 19 for $60, which is the same type and size as the previous one. I also got a new set of sparks just in case. If I get the prop before the weekend I'll do some testing and come back with the results. However, I'll be looking for a cheap 17P prop to continue the search for that optimum setup. By the way, what's your opinion regarding stainless steel props? Thx again! Fred
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Post by gnrphil on Jan 9, 2017 21:19:30 GMT -6
If your AV plate is level with the bottom of your hull you're running to low, best way to check is while running up on plane, the AV plate should be visable on top of the water. I'll post a video later, watching the SEC kick some but right now .
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Post by Juan on Jan 10, 2017 6:12:14 GMT -6
watching the SEC kick some but right now . That didn't turn out quite the way I hoped!!! 013
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Post by gnrphil on Jan 10, 2017 10:06:08 GMT -6
watching the SEC kick some but right now . That didn't turn out quite the way I hoped!!! 013 No Sir, looked good there for a minute. Good game though.
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Post by Juan on Jan 10, 2017 13:30:27 GMT -6
That didn't turn out quite the way I hoped!!! 013 No Sir, looked good there for a minute. Good game though. Yes it did but that feeling didn't last long. They earned and deserved the win. There's always next year.
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Post by gnrphil on Jan 10, 2017 20:38:56 GMT -6
Here's that video
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Post by captfred on Jan 12, 2017 21:16:44 GMT -6
Thx for the plate info! I'll try to run the boat on Sunday with both props and will check the AV Plate's position if above or below the water. I still have 3 bolt holes above current position to get the motor higher. Will come back with the results. Thx!
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Post by captfred on Jan 12, 2017 21:31:09 GMT -6
Wow man! That was so logic and eye opening. Can we assume that a "digged" AV Plate with too much trim can cause so much drag that it would be abnormally slow at high RPM like in my case? Would trim tabs help on lifting the stern on a boat with a too low mounted motor? Or they would just lower the bow? Thx!
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Post by gnrphil on Jan 12, 2017 22:04:41 GMT -6
Wow man! That was so logic and eye opening. Can we assume that a "digged" AV Plate with too much trim can cause so much drag that it would be abnormally slow at high RPM like in my case? Would trim tabs help on lifting the stern on a boat with a too low mounted motor? Or they would just lower the bow? Thx! Yes, the lower unit will create drag and slow you down, you will increase rpm and speed by raising it. You may also find you're able to run a higher pitch prop after its at the right height. Yes and No, deploying tabs will also create some drag. Tabs are not a fix for a motor mounted too low. Interested to see what you have when you run it next.
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Post by captfred on Jan 14, 2017 13:36:17 GMT -6
Hi! I got the test prop, just hoping seas come down a little. They're expected to be at 8 to 10 outside the bay tomorrow so I'll have to see if it the ramp is safe as it gets really choppy. If unable I'm off on Wednesday then I'll do the tests. Thx!
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