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Planing on one outboard

Old 02-25-2016, 06:15 AM
  #41  
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My 28 ocean master (shortened 31) with twin 250 ox66 not only planes off on one motor but could probably get by with one motor indefinitely. With one, not changing props I get 4800 rpm 38 mph, I don't even have tabs, and Noone has to go up front.
What allows this is the almost flat transom deadrise, a deep v just takes too much power.
Old 02-25-2016, 07:13 AM
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Originally Posted by HarvestTime View Post
My 28 ocean master (shortened 31) with twin 250 ox66 not only planes off on one motor but could probably get by with one motor indefinitely. With one, not changing props I get 4800 rpm 38 mph, I don't even have tabs, and Noone has to go up front.
What allows this is the almost flat transom deadrise, a deep v just takes too much power.
I believe it. Spent summers in the Abacos on a 31 with a full tower, only had twin 150 Yamaha two strokes and was all we needed. Great hulls.
Old 02-25-2016, 08:41 AM
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Yea a friend of mine keeps telling me to repower with twin f150's in hopes of breaking into the unheard of (in the ocean master community) 2mpg lol
Old 02-25-2016, 09:46 AM
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Originally Posted by pas View Post
You are 100% wrong.

All of it is hard, my boat will plane out on one engine and get up to around 30, but the engine is only turning 2600 RPM making close to 30 psi of boost and running EGT close to 1200 degrees. That is not a happy engine or outdrive.

My wide open rpm is about 4000 (55-58 mph) and I am normally around 25 psi of boost and 1150-1200 EGT.

I have never lost a motor but if I do I am fast idling home, no reason to kill the one good motor you have left as many others have said.

I guess it depends on the boat, yours definitely does not sound happy running on only one. But some of these guys are talking about running nearly 40 miles an hour with only one motor so it doesn't sound like same situation as your boat. I was just saying that IF you were going to run on one, it seems to me it would be wise to at least jump on plane with both IF you can.
Old 02-25-2016, 09:56 AM
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I'm genuinely surprised at how many boats here are able to plane off on one engine without any change in prop pitch. However, I'm not necessarily surprised to hear that the engines seem to be two strokes and generally at the higher end of the horsepower range. And aside from a few exceptions, I'm not seeing too many boats that are, say, 28 feet and larger and true offshore hulls.
What about the current trend of boats in the 25-30 foot range that are often running twin 150 fourstrokes or maybe 200s? 26 seahunt 28 cobia, etc etc.Those types of boats that are often sold with minimum, yet sufficient twin power.

I'm more interested in hearing from people who have boats like a 32 Seavee, 33 invincible, 32 yellowfin, 32 contender, etc which are all dedicated offshore hulls with 22-24 degree deadrise and are often specd out with twin 300 fourstrokes. When 60 miles out and an engine goes, will these boats be able to run in on plane? My guess is no, but this thread seems to be proving me wrong.
Old 02-25-2016, 09:57 AM
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Originally Posted by john kent View Post
In a twin outboard engine setup, who can do it without switching props?

My whaler planes easily with the 250 only..

But the 9.9 just can seem to get it where I need it. Thinking I need a different pitch on that prop..
Old 02-25-2016, 10:52 AM
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Originally Posted by Jim311 View Post
I guess it depends on the boat, yours definitely does not sound happy running on only one. But some of these guys are talking about running nearly 40 miles an hour with only one motor so it doesn't sound like same situation as your boat. I was just saying that IF you were going to run on one, it seems to me it would be wise to at least jump on plane with both IF you can.
I understand your thinking but look at differently.

35' center console with twin 300's

You don't need 600 hp to get on plane, most likely you can do it a much lower rpm where each engine is only making 100 hp. Then once up and running you may be using 200 hp between both engines. So when you remove one engine from the equation the single engine has to work very hard to get on plane but it is a short duration. Once you are up and running to maintain that on plane speed still takes 200 hp so now that one engine is severely loaded trying to make it happen. Its like driving uphill in your car in to high of a gear except that the hill never ends. Not saying you can't do it but if you are trying to get home better to be patient and make it versus killing the one good engine you have. Also don't forget the gear case and prop are now carrying double the load they normally do and that could be another potential failure.
Old 02-25-2016, 11:56 AM
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I can & have in the Ranger. Old ('95 vintage) Mercury Black Max 150's. It takes me two hole shots to do it. I firewall the engine then chop it back to idle. When the wake washes back into the stern & lifts it, I slam it to WOT again & surf the wake to get on plane. After that, I can stay up fine.

Would I do it out of impatience? No, no way. Now, if I had one down with a waterspout bearing down on me, I sure would. Emergency use only & only for short (very short) periods.

I've never considered keeping an extra prop around that was purpose-sized for running a single, if needed. I may look into that.
Old 02-25-2016, 12:36 PM
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I tried in my old SCarab 302 when the Yam 200 head blew. Then the 6 month old other lower unit tore up. so no.
Regulator with 300s.. NOpe.
Worldcat 302 with 250s.. Nope. But I can change props easily and relatively savely from the platform without getting wet. I carry a lower pitch on long trips.
Old 02-25-2016, 04:14 PM
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Originally Posted by coores14 View Post

I'm more interested in hearing from people who have boats like a 32 Seavee, 33 invincible, 32 yellowfin, 32 contender, etc which are all dedicated offshore hulls with 22-24 degree deadrise and are often specd out with twin 300 fourstrokes. When 60 miles out and an engine goes, will these boats be able to run in on plane? My guess is no, but this thread seems to be proving me wrong.
We're on a new 30st contender, and I have not been able to get it on plane with one motor (runs twin f300 yamaha).
Old 02-25-2016, 05:04 PM
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Originally Posted by john kent View Post
noticing a trend already....two stroke torque increases ability of twin engine setups planing on one engine without re-propping.
Not really, depends on the setup. 26' mako running on 1 4 stroke 175hp 32+MPH

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Last edited by v12mac; 02-26-2016 at 09:10 AM.
Old 02-25-2016, 08:34 PM
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Worldcat 320cc with 300 4 stroke yamahas planes on one engine with very little effort
Old 05-19-2016, 12:13 AM
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Would it be worth carrying a spare set of props with a more appropriate pitch, and just throwing one on for that one time you need to plane and "get home" on just on motor? At least for setups where is would be possible otherwise, just to reduce some of the motor lugging,

Last edited by wp3223; 05-19-2016 at 12:33 AM.

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