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Cat up on plane with one motor?

Old 01-11-2019, 03:18 PM
  #21  
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Originally Posted by alloyboy View Post
Do you hate your motors? Why would you want to abuse them so?
To get home. Motor is fine to this day.
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Old 01-11-2019, 03:27 PM
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My WC 266SF with Optimax 150s would plane easily on one engine and cruised comfortably (80% power) at 24-25 MPH on one. It was propped to run about 41mph @WOT with both enignes. My WC 270TE with Yamaha F225s really struggled to plane on one engine and really did not like running on one. It was propped to run 50-51mph @WOT with both engines.

Difference between 2S and 4S....
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Old 01-11-2019, 03:32 PM
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26 Glacier Bay able to do 18 to 20 knots with one motor with 150 Suzuki 4 strokes.
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Old 01-11-2019, 03:37 PM
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Regulator 26 with ox66 225 would not plane on one engine. Lower picth props would be handy if you have plans on breaking often
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Old 01-11-2019, 03:54 PM
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Twins on a cat are propped for running twins and unfortunately many put more importance on speed over prop load, expecting to plane home on 1 engine is generally not going to happen unless you have extra HP than required in the first place or drop the props down a size or 2, pushing 1 engine hard on any hull that is setup and propped for twins is not good, the general idea is to run at a speed that will get you home and not over stress the engine.
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Old 01-11-2019, 04:04 PM
  #26  
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My 23' World Cat wouldn't plane on one engine with 115 4 strokes. Repowered to 150 2 strokes and will run mid 30's on one engine, but I've only done it with a light load out of curiosity. As I recall, my RPMs were just under the lower limit for WOT at that speed too.

Sounds cliche, but the torque of the 2 stroke to getting it past the "hump" seems to be the major difference.
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Old 01-11-2019, 04:47 PM
  #27  
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There is a video out from a few years ago with a Calcutta 263 planing on one 90 hsp honda
I can say that a 140 Suzuki also will do it on a 263 Calcutta, Think it might have something to do with the hull design.
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Old 01-11-2019, 05:24 PM
  #28  
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Going to have to learn more about props I guess. Iím assuming these are the standard props that came on my motors? Also, the boat had the permtrims on it when I bought it. Had the boat three years and a motor only went out on me twice (once was gas and the other an IAC valve). Not my normal practice if I can avoid it.
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Old 01-11-2019, 05:37 PM
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Can you put left prop on right engine anr run it reverse? This way you could have one spare lower pich prop on the boat
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Old 01-11-2019, 07:37 PM
  #30  
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Your other post related that you cannot even reach 5,000 RPM with the Suzuki 140's--so there is something wrong there. Excessive weight--due to water in the hulls would be my guess.
The 140 is a "Weak" 140---it is on the 115 block. The 150 is a much larger engine. I doubt that even at light weight--and with engines running correctly--correctly propped--that the boat will plane on one engine.

Consider that 6 knots is a very respectable speed to bring the boat "home" with. Live with it. But find out why the engine/boat is under performing. I have not yet seen WOT speed numbers? What are they.

Last edited by thataway; 01-12-2019 at 01:46 PM.
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Old 01-11-2019, 07:42 PM
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Originally Posted by bnz View Post
Mine is a 23í cat with twin zuk 140s. Boat weighs about 4500 lbs I believe.
Might be why. The 140's are the same block as a 115 so its lacking displacement. The 150's are much stronger and bigger displacement.
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Old 01-12-2019, 05:47 AM
  #32  
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Now that makes sense. Always wondered why the 140 weighed less than the 115 (405 lbs vs 412 lbs) and a hundred pounds less than the 150 (522 lbs).

Okay, another question now. If the boat is rated for 280 hp, what happens if you were to put a heavier engine like the 150s on it? Just curious, not that Iím going to.

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Old 01-12-2019, 07:16 AM
  #33  
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Originally Posted by bnz View Post
Now that makes sense. Always wondered why the 140 weighed less than the 115 (405 lbs vs 412 lbs) and a hundred pounds less than the 150 (522 lbs).

Okay, another question now. If the boat is rated for 280 hp, what happens if you were to put a heavier engine like the 150s on it? Just curious, not that Iím going to.

Woking for Florida Sportsman Magazine as the boating editor and also testing for BoatTest.com, Ive run just about every cat on the market and many different length hulls from the same manufacturer. My experience has been that not all cats will plan on one engine and some of the ones that do are putting too much strain on the one motor that is not running in its RPM range. It all depends on hull design, interior configuration (weight) and the outboard hp. As mentioned before in this thread, yes, every 2 stroke I tested performed better running as a single then the 4 strokes did. When your boat was built and designed it was powered with much lighter 2 strokes. If you ever re-power, look at taking away weight not adding hp.
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Old 01-12-2019, 07:23 AM
  #34  
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I have Zuk Df140's on a 25.5 cat, I can plane and hit 18mph on one motor... OP, you have issues with your setup, maybe worth having a mechanic have a look just to see if the engine is operating in spec. That would help you determine if it's your power plant or the hull that needs some trouble shooting. There are way too many variables right now it seems to me.

and to answer another posters question....yes it wants to run in circles when you run one motor on a cat, not a practice i make a habit of, just a way to get home when one motor is acting like a bitch.

Good luck
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Old 01-12-2019, 08:48 AM
  #35  
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I have 300 g2 on my 27' cat don't know and ain't going to try it probably would.
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Old 01-12-2019, 09:53 AM
  #36  
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My 26 Twin vee with 150ís would but only with a very light load. My 31 with 300ís will no problem. It will run 25mph at 4500rpm in one motor.
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Old 01-12-2019, 12:07 PM
  #37  
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I owned the same hull with 115's and it was set up right, but would not plane on one engine as it was propped to get max economy and speed with two props.
These hulls weigh 3700 dry with now motor, top, fuel, fresh water, gear or trailer when they were new up to 17 years ago if you have the 2002.. Ypo have most likely absorbed some water in one of the 3 foam compartments in each sponson. They will partially dry out if you tilt her trailer bow up with the drain plugs when you store her.Leaving and changing pieces of weighted newspaper under the rear drain plugs will stain them with water, and let you know when the dripping stops.
Your hull probably now weighs closer to 7000 lbs loaded out, and you are over propped. by up to 4" of pitch if you can only get 5000 rpm's wide open. changing props is recommended.

As Dave Est said, cats are sensitive to weight, and small cats more so.

The hull will not take much more weight in the back as the transom is already closer to the water level but there are now 150's that are lighter than Suzuki's, and 150's on that hull are game changers. I could get 40 on mine with a large umblla style ttops so that was plenty fast enough for me as 25 miles was the farthest I had to got out in Mexico 90% of the time.

Last edited by Bullshipper; 01-12-2019 at 12:20 PM.
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Old 01-12-2019, 06:38 PM
  #38  
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I read that you have 22" pitch props. Too much load on one engine to plane with those props. Don't do it. The cylinder pressures go through the roof. Nice and easy on one engine getting home.
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Old 01-12-2019, 07:04 PM
  #39  
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I have a World Cat 230cc (new hull style) with twin Yamaha 115’s and I can plane on one no problem and cruise at a respectable 25-27MPH. Wouldn’t run it like that unless one engine went down and had to run in. Handling was almost normal as far as steering.
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Old 01-12-2019, 08:15 PM
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Originally Posted by bnz View Post
Going to have to learn more about props I guess. Iím assuming these are the standard props that came on my motors? Also, the boat had the permtrims on it when I bought it. Had the boat three years and a motor only went out on me twice (once was gas and the other an IAC valve). Not my normal practice if I can avoid it.
Do you get any cavitation I cant see how long the threads are on the permatrims but the bolts should usually be the other way nuts on top
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