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Suzuki 300 APX - 4 Blade Stainless Props

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Suzuki 300 APX - 4 Blade Stainless Props

Old 09-26-2018, 03:05 PM
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Default Suzuki 300 APX - 4 Blade Stainless Props

Hi guys - any Suzuki 300 owners tried the Stainless 4 blade props ?
genuine or non genuine.
Single Outboard
cheers
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Old 09-26-2018, 03:34 PM
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I would be interested to know how the four blade runs compared to the 3x16" diameter props as well on a single installation.
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Old 09-26-2018, 03:38 PM
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Originally Posted by Grim Reefer View Post
Hi guys - any Suzuki 300 owners tried the Stainless 4 blade props ?
genuine or non genuine.
Single Outboard
cheers

Yes, I have, and I'm sure there are others on here who have - but what is your question? When going from Suzuki's 3 blade to 4 blade props you generally have to go up about an inch in pitch, ie I had a 3x16x20 and a 3x16x21.5, and their 4x15x22 worked fine rpm wise in place of both of these, giving me a little more stern lift and a knot or 2 less speed). But answers will depend a lot on what kind of boat you have (ie length, deadrise, weight of boat, etc.)
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Old 09-27-2018, 02:41 AM
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From what I hear the 4 blades start to really hurt fuel economy above 4200 rpm
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Old 09-27-2018, 05:23 AM
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DF250 (mechanical) owner here: Boat had a 3x16x21.5 on my boat when I purchased it. The 3 blade cruised nice (25 mph @ 3900 rpm was comfortable) and was very fast (50.0 mph on GPS @ 6000 rpm). My issue with the 3 blade was that I could not hold plane at less than 22 mph and the boat would crawl up on plane with a fishing load. I needed WOT to get on plane. I changed to a 4x16x20 Powertech with the help of Ken from PropGods. The 4 blade has the same cruise characteristics, but I can jump on plane with any load and hold plane down to 18 mph for when it gets rough. My boat also needed a stern lifting prop to help with performance. I did lose a couple of mph at WOT, now it runs 45 mph at 5900 rpm with a normal load. That is plenty fast. 4000 rpm at 27 mph sees 3 mpg. WOT at 45 mph is 2.5 mpg. I really need to write down my fuel burn and speed at each 500 rpm. I feel like the need for this information comes up a lot.
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Old 09-27-2018, 07:54 AM
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The 4 blade props decrease fuel economy but provides more bottom power and grip in turns. Also allows you to run on high jack plate heights.

The blade config, size, and pitch just really depends on the application. For example, I use 4 blade props on my 300 in the winter during low tide and runnings tight canals, but use a 3 blade 16" prop for running offshore for both speed and fuel economy.
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Old 09-30-2018, 11:52 AM
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Originally Posted by sonofasonofasailor View Post
DF250 (mechanical) owner here: Boat had a 3x16x21.5 on my boat when I purchased it. The 3 blade cruised nice (25 mph @ 3900 rpm was comfortable) and was very fast (50.0 mph on GPS @ 6000 rpm). My issue with the 3 blade was that I could not hold plane at less than 22 mph and the boat would crawl up on plane with a fishing load. I needed WOT to get on plane. I changed to a 4x16x20 Powertech with the help of Ken from PropGods. The 4 blade has the same cruise characteristics, but I can jump on plane with any load and hold plane down to 18 mph for when it gets rough. My boat also needed a stern lifting prop to help with performance. I did lose a couple of mph at WOT, now it runs 45 mph at 5900 rpm with a normal load. That is plenty fast. 4000 rpm at 27 mph sees 3 mpg. WOT at 45 mph is 2.5 mpg. I really need to write down my fuel burn and speed at each 500 rpm. I feel like the need for this information comes up a lot.
Is there a big increase in Fuel useage ? Before owning the Suzi 4 stroke I had a 4 blade on a 2 stroke & the fuel useage increased dramatically
cheers
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Old 09-30-2018, 11:54 AM
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Originally Posted by Motor Hand View Post
The 4 blade props decrease fuel economy but provides more bottom power and grip in turns. Also allows you to run on high jack plate heights.

The blade config, size, and pitch just really depends on the application. For example, I use 4 blade props on my 300 in the winter during low tide and runnings tight canals, but use a 3 blade 16" prop for running offshore for both speed and fuel economy.
Hi - any idea on the extra fuel useage ? With the 4 blade
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Old 09-30-2018, 04:38 PM
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Originally Posted by Grim Reefer View Post


Hi - any idea on the extra fuel useage ? With the 4 blade
If you have a lot of slippage with 3 blades MPG can go up. What prop are you running now and what problems do you have?
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Old 09-30-2018, 04:53 PM
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3x16x17R suzuki Stainless, - prop setup @ wot in calm water (River)
Boat is a deep vee hull, 24ft,CMC jacking plate, 20 degree deadrise, prob 2.5t to 2.8t in water loaded, prob bum heavy, hoping to get some improvements by changing prop - cruise now between 20 & 26 knts depending on sea conditions.
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Old 09-30-2018, 05:08 PM
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RPM's at WOT?
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Old 09-30-2018, 07:38 PM
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6000rpm @ 40 knts
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Old 09-30-2018, 08:02 PM
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Originally Posted by Grim Reefer View Post
6000rpm @ 40 knts
Sounds like it is propped pretty good right now. If you are blowing out a 4 blade will help and give you some stern lift if it porposes. I would stay with a 16" diameter prop, not the 15.25" Zuke. Power Tech LFS4 is what a lot run on the 300 including me.
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Old 10-01-2018, 06:05 AM
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Originally Posted by Gary999 View Post
Sounds like it is propped pretty good right now. If you are blowing out a 4 blade will help and give you some stern lift if it porposes. I would stay with a 16" diameter prop, not the 15.25" Zuke. Power Tech LFS4 is what a lot run on the 300 including me.
I have a 3x16x18.5 on my 250ap on a 25' CC with the engine on a bracket. I love the whole setup (hole shot, WOT, cruise economy, etc.) but it does porpoise unless I drop the tabs and trim down a bit. I didn't know a change to 4 blade would help the porpoising. How does it do that?
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Old 10-01-2018, 07:38 AM
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Originally Posted by baldy View Post
I have a 3x16x18.5 on my 250ap on a 25' CC with the engine on a bracket. I love the whole setup (hole shot, WOT, cruise economy, etc.) but it does porpoise unless I drop the tabs and trim down a bit. I didn't know a change to 4 blade would help the porpoising. How does it do that?
The cone of the thrust, prop wash, that radiates from the prop is fatter and shorter. Think a short traffic cone with a wide base with the point placed at the prop on its side. The top of the cone of water is thrusting against much thinner water than below. The top of the thrust cone "blows out" closer to the boat than a non-stern lift prop. By giving up thrust at the top of the cone the stern is lifted by the bottom of the cone since it is not blowing out. A regular prop would be a long cone with a thin base so when the top blows out much further back so it has limited effect since the energy is pretty much dissipated.

continuousWave: Whaler: Reference: Propeller: Part 3
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Old 10-01-2018, 07:43 AM
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Originally Posted by Grim Reefer View Post


Is there a big increase in Fuel useage ? Before owning the Suzi 4 stroke I had a 4 blade on a 2 stroke & the fuel useage increased dramatically
cheers
I did not have fuel management hooked up when I was running the 3 blade. I guess I could swap back to it for some testing, but the all around performance is so much better with the 4 blade. I am okay with 2.9-3 mpg at cruise with a normal load. The boat literally does everything better with the 4 blade on my setup.
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Old 10-01-2018, 09:20 AM
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Originally Posted by Gary999 View Post
The cone of the thrust, prop wash, that radiates from the prop is fatter and shorter. Think a short traffic cone with a wide base with the point placed at the prop on its side. The top of the cone of water is thrusting against much thinner water than below. The top of the thrust cone "blows out" closer to the boat than a non-stern lift prop. By giving up thrust at the top of the cone the stern is lifted by the bottom of the cone since it is not blowing out. A regular prop would be a long cone with a thin base so when the top blows out much further back so it has limited effect since the energy is pretty much dissipated.

continuousWave: Whaler: Reference: Propeller: Part 3
Interesting. So what 4-blade would be the best replacement for my 3x16x18.5p Suzuki prop? I currently hit 5950 rpm at WOT (47 mph) light and 5500 rpm at WOT (40 mph) loaded.
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Old 10-01-2018, 09:56 AM
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LFS4 18 should be right on. Call or email Ken at Prop Gods.
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Old 10-01-2018, 09:59 AM
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Pro-Line 251 with hardtop and full curtains. DF300AP on a 30 inch bracket.
I have tried 4 props. The best thus far is a Powertech OFX 4 blade with 19P. WOT is 43mph and 1.7 mpg at 5900rpm. 30mph and 2.4mpg at 4250rpm. This is with 125 gallons of fuel. Slower planing speeds too.

Next best is Suzuki 3x16x18.5: WOT 45mph and 1.7mpg at 6000rpm. 32mph and 2.3mpg at 4560rpm.

Suzuki 3x16x17: 31mph and 2.2mpg at 4600rpm.

Worst was Powertech LFS 4 blade with 17P was horrible! High slip at all RPM's. WOT was 34mph and 1.4mpg at 6280rpm. 22mph and 2.1mpg at 4200rpm.
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Old 10-01-2018, 01:07 PM
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Originally Posted by First Light View Post
Yes, I have, and I'm sure there are others on here who have - but what is your question? When going from Suzuki's 3 blade to 4 blade props you generally have to go up about an inch in pitch, ie I had a 3x16x20 and a 3x16x21.5, and their 4x15x22 worked fine rpm wise in place of both of these, giving me a little more stern lift and a knot or 2 less speed). But answers will depend a lot on what kind of boat you have (ie length, deadrise, weight of boat, etc.)
Can you plane at a lower speed? Thats what Im looking for. No one in my area has loaner props and I dont want to play the mail it back and forth game. Currently have the 3x16x18.5

Last edited by barrell; 10-01-2018 at 01:13 PM.
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