Finally getting to do some initial tests of a selection of propellers. I will probably add some cupping to the 13p stainless prop that performed best and re-test.
So, I guess the 13p stainless is the winner by a small margin over the aluminum propeller. It would have been interesting though to see the fourblade in 12p.
Hi mate, Yeah the 13p stainless is the winner by a fair bit because the propeller doesn’t loose grip during turns, the 13p alloy prop has bad cavitation during turns. I will probably add some extra cupping to the stainless prop and may see more top end speed. cheers and thanks 🙏
great video, just wondering what type of work you've done with four blade power tech propellers ?? how you trialed 9 and 10 inches ?? if so, what do you recommend for shaping and do you have any videos on modifying them ?? cheers
Hi Mate, I haven’t done much with the 4 blade PowerTechs other than that 9 pitch I tried in the video. 9 and 10 pitch are not enough pitch for a normal aluminum boat. those propellers are more suited to an inflatable surf rescue boat. cheers 🍻 Aussie Boat Guy 😎
Hi Champ, Unfortunately adding pitch to a 2.5hp most likely will not add any speed. It may well just load the motor more and loose speed. Very hard with the tiny hp motors to get more speed as the speed they produce stock is so low so even adding 10% you still don’t notice. Adding 10% speed to a motor that is doing 40mph you do notice. Cheers 🍻 Aussie Boat Guy 😎
Hi Mate, It really depends on what boat it’s on and how heavy that boat is plus what rpm you are getting with the 7.5 pitch. Sometimes the lower pitch props are quicker top end because they allow the motor to spin up to max rpm plus quicker up onto the plane. If your motor is over-revving then yes step up to 8:5 pitch for sure. I am always up for just trying to see if it works better too. cheers 🍻 Aussie Boat Guy 😎
@@25hpboatracerman thanks mate for answer. Have elan 401 its boar long 3.9 meters and im getting 30 kmh. Was wondering would that prop impove smth. Its reaching top speed pretty fast and engine look like he handle it smooth
Hi, great video a good propeller to insert in your test is a 10x17 aluminium, but you need to cut 1 inch each blade to reaches 8 inches diameter. I think you can reaches 72 km/h or more.
Hi mate, Yeah, sounds like a good project. The only 10 x 17 I know is an OMC (Johnson- evinrude) so would have to re-bush and machine the step down in the hub to fit the tohatsu- Mercury rear bearing carrier. Have you done this? And was it on a Johnson or a Mercury- Tohatsu? Cheers 🍻 Aussie Boat Guy 😎
@@michaeljentsch9320 Yep SRA3 11pitch Revs where over 6400rpm Bit much for a fishing rig, I didn’t mind when I was racing those motors going up to about 6500rpm, they don’t mind. Cheers 🍻
@@25hpboatracerman Yeah nice. You reckon a 13p would keep it in the 5500 - 6k mark? I have the same motor to go on same boat, converting to forward steer. Was looking at the michigan wheel ballistic 13p though but was worried it would rev too high. Wondering if the sra3 would lower the rpm slightly, wa aiming to eliminate the bow rise caused by the higher rake on the sra3 have you tried the Ballistic before?
@@michaeljentsch9320 Hi mate, I haven’t tried the ballistic before but have heard they are great. I would not be worried at all about bow rising if you are going forward steer, the rake will probably be a good thing. I am not sure that the ballistic props are much different in rake than the SRA. Keep in mind that if you get a 13p and your revs are too high you can always have more cupping added. Cheers 🍻
I've got a Tohatsu 30 2 stroke ...came with 11p .. swapped it out for 13p .... Goes faster top end...but big diff is revs at "normal" speed... dropped by 500-600rpm .
Hi champion 👌👍 want to let you know, you have always been such a support to this channel, thanks so much mate 👌 yeah, it’s been a while, I have been battling a health crappy thing and it has made it hard to do my normal hobby (boating - outboards whenever I can) Hoping that I’m back into things fully soon. cheers and thanks again mate. Aussie Boat G 😊
awesome mate another great vid good to be back mate. One question mate I have a 3.6 m flat bottom punt boat fully decked out casting deck I was planning on putting a 25hp or 30hp on it in the future I was just wondering if it can be possible or will my boat can handle with a bigger motor as right I'm running a 15hp tohatsu with mariner stickers thanks mate?
Hi mate, not too sure on your exact boat but see if you can find a maximum hp for the hull, should be on your compliance- manufacturers plate. hope it works out 👍 cheers 🍻
Hi mate, Maybe but maybe not. It depends on what boat it’s on and how heavy the setup is, how many revs your doing at full throttle with the 9p. Prop pitch is a bit like changing gears in a car but the car is going up a hill (because of a boats drag) 9p might be the perfect gear but 11p might make the motor struggle and slow the revs so much that you loose speed. In saying that I always like to try props out so see what performance difference they have but going from a 9 to an 11 on a 15hp unless it is over revving may be a bit much. Also keep in mind if you raise pitch you will have a slower take off too. Cheers 🍻 Aussie Boat Guy 😎
What do you think of the fish nipper? I have a new Mercury 20 with the new centre position tiller and wondering if it would suit? Current boat wants to tip me out as I can’t distribute weight well enough
I’ve got a few videos (review) on the fish nipper on the channel if you want to see it in other conditions etc. I really like the fish nipper and it is the most stable 3.5m tinny I have been in. I am 80kgs, sit in the starboard stern and have a 12 liter fuel tank port stern, if I was heavier it may change things but I’m sure I would position things to suit. Yeah, I guess the centre tiller moves you about 150mm further starboard too. Cheers 🍻 Aussie Boat Guy 😎
Yes I would have liked to see 13p 4 blades prop because your boat was very light. That one may have been the fastest. I think you should keep the diameter the same and go up 1 pitch and down one pitch. I think the motor could have used one pitch up it was going very easily at that pitch. Your boat is a skimmer
Hey mate I have a 3.8m tinny with a 30 hp tohatsu 2 stroke I have a stock 13 pitch aluminium prop on it it goes 62 kph and it cavitates alot. I am looking at buying either a 12 pitch stainless or should I get a 13 pitch stainless. Would you recommend the power tech sra3 or a solas stainless props. Cheers. 🤙
Hi mate, Yeah the stock alloy does cavitate a fair bit hey. I personally have not tried the solas props on the 30hp but from the look of them they don’t have much of a rake compared to the SRA PowerTech whether that’s a good thing or not? Normally more rake less cavitation. As for pitch it’s a hard one as each prop manufacturer will be slightly different. Unfortunately the best way is to try them (so hard I know) and a PowerTech will work better on some hulls and the solas better on others. Please keep me posted on your results mate, would be very interested to hear your thoughts. Cheers 🍻
Great video gives you an idea how different pitches affect performance, I am thinking of going from a 13 pitch to an 11 with my 25hp Mercury because it's not getting on plane if it's loaded with a lot weight and/or at high altitude it already has electric trolling motor with batteries, floor ect then with a heavy passenger it's too much is there any danger of the motor overreving if you go too small with the pitch?
Hi mate, cheers. If your boat is battling to get on the plane with the 13p then you should have no issues with the 11p over revving. You are correct that if you go too small a pitch the motor will over rev, like when I put the 9p on my light setup. As long as the max revs at full throttle are within the recommended range (better near the top of that range too) then it’s ok 👌. All the best Aussie Boat Guy 😎
@@25hpboatracerman thanks so much for your reply Wide open throttle is meant to be 5000 - 6000 rpm.I watched you other video on installing the tachometer and have ordered one off ebay the same so I can keep an eye on the rpm, that was an awesome video also showing that it's not that hard to install a tachometer Thanks again Alexander
Just going from a 12 to a 9 on yamaha f20b 4 stroke. Was fast top end with just me but super sluggish, no plane with 3 people. Was the 9 pitch more fun?
hey mate 👋 the only difference is the gasket just behind the carburetor, it has a smaller hole. Order a 39hp gasket and install then your golden. cheers 🍻
Possibly, you would have to try it. If you are reaching near maximum rpm (full throttle) with a 13p and your hole shot it ok then a 14p probably wont do much apart from make getting up on the plane even slower, a bit like starting a car in second gear. If you have a really light boat set up (empty 10ft tinny) a 14p will be great 👍 What I have seen on other setups is the top speed sometimes doesn’t change much with the larger pitch props but the rpm at full throttle is lower at the cost of hole shot and feeling a bit sluggish onto the plane. But always worth a try if you have the opportunity 👌 Keep me posted
Hey mate, Engine height, boat weight, propeller and trim setting also weight placement in the boat. if it is a Japan built Mercury you can add parts off an 8hp or 9.8hp. cheers 🍻
Yea thanks mate, I’ve got it on a 3m flat bottom punt witch is ultra light and only weighs around 30kg, but I’ve heard that a 6hp Japanese like mine can go 41 on a 255 tender witch is a v nose. Do you know anything about this?
@@FR54321 Yeah, maybe , probably more in the high 30kph range. The 6hp Japan made is the same capacity as the 8 and 9.8hp. I have seen 42kph with a 9.8hp on a small tinny. You can definitely grab an 8hp carburetor for some more power
@@FR54321 No, you can put an 8hp carburetor on your 6 and get a bit more power. You cannot put a 9.9 carb on but you can put a 9.8hp carb on but the 9.8hp has a fair few different parts like a high compression head, I think it has different ports as well, possibly different exhaust. Cheers 🍻
So, I guess the 13p stainless is the winner by a small margin over the aluminum propeller. It would have been interesting though to see the fourblade in 12p.
Hi mate,
Yeah the 13p stainless is the winner by a fair bit because the propeller doesn’t loose grip during turns, the 13p alloy prop has bad cavitation during turns.
I will probably add some extra cupping to the stainless prop and may see more top end speed.
cheers and thanks 🙏
The 13p stock ally prop are great for these motors, I've modified the for racing the Dam 2 Dam in Kununurra also.
Yeah mate,
I was surprised with how well the stock 13p alloy stacked up.
Dam to Dam, so much fun 👌👌😁
Cheers 🍻
Aussie Boat Guy 😎
great video, just wondering what type of work you've done with four blade power tech propellers ?? how you trialed 9 and 10 inches ?? if so, what do you recommend for shaping and do you have any videos on modifying them ??
cheers
Hi Mate,
I haven’t done much with the 4 blade PowerTechs other than that 9 pitch I tried in the video. 9 and 10 pitch are not enough pitch for a normal aluminum boat. those propellers are more suited to an inflatable surf rescue boat.
cheers 🍻
Aussie Boat Guy 😎
Great video that’s tinny looks like so fun to drive
Thank you 🤗
yeah it’s a blast 💥
cheers mate
Aussie boat g
Will adding an inch pitch to a 2.5 HP Suzuki increase speed ? All other parameters being equal.
Hi Champ,
Unfortunately adding pitch to a 2.5hp most likely will not add any speed. It may well just load the motor more and loose speed.
Very hard with the tiny hp motors to get more speed as the speed they produce stock is so low so even adding 10% you still don’t notice. Adding 10% speed to a motor that is doing 40mph you do notice.
Cheers 🍻
Aussie Boat Guy 😎
do u think 8.5 prop would be better than 7.5 on mercury 8 hp
Hi Mate,
It really depends on what boat it’s on and how heavy that boat is plus what rpm you are getting with the 7.5 pitch. Sometimes the lower pitch props are quicker top end because they allow the motor to spin up to max rpm plus quicker up onto the plane.
If your motor is over-revving then yes step up to 8:5 pitch for sure. I am always up for just trying to see if it works better too.
cheers 🍻
Aussie Boat Guy 😎
@@25hpboatracerman thanks mate for answer. Have elan 401 its boar long 3.9 meters and im getting 30 kmh. Was wondering would that prop impove smth. Its reaching top speed pretty fast and engine look like he handle it smooth
Hi, great video a good propeller to insert in your test is a 10x17 aluminium, but you need to cut 1 inch each blade to reaches 8 inches diameter. I think you can reaches 72 km/h or more.
Hi mate,
Yeah, sounds like a good project.
The only 10 x 17 I know is an OMC (Johnson- evinrude) so would have to re-bush and machine the step down in the hub to fit the tohatsu- Mercury rear bearing carrier.
Have you done this? And was it on a Johnson or a Mercury- Tohatsu?
Cheers 🍻
Aussie Boat Guy 😎
@@25hpboatracerman Hi, exist a propeller mercury black max 10x17. Seek for it. Sorry for bad english.
At grabcad exist a propeller 7.35x18.3.
At grabcad exist a propeller 9.9x24.75.
Been waiting sooooo long for this video 🥳
Hi mate,
yeah, the delay has annoyed me more than anyone, I wish I could be on the water way more. the last year has just been 🤦♂️🤦♂️🤦♂️
cheers 🍻
@@25hpboatracerman Tell me about it mate.
Out of curiosity, was that Sra3 really an 11p and what was engine rpm at full throttle?
@@michaeljentsch9320
Yep SRA3 11pitch
Revs where over 6400rpm
Bit much for a fishing rig, I didn’t mind when I was racing those motors going up to about 6500rpm, they don’t mind.
Cheers 🍻
@@25hpboatracerman Yeah nice.
You reckon a 13p would keep it in the 5500 - 6k mark?
I have the same motor to go on same boat, converting to forward steer.
Was looking at the michigan wheel ballistic 13p though but was worried it would rev too high. Wondering if the sra3 would lower the rpm slightly, wa aiming to eliminate the bow rise caused by the higher rake on the sra3 have you tried the Ballistic before?
@@michaeljentsch9320
Hi mate,
I haven’t tried the ballistic before but have heard they are great.
I would not be worried at all about bow rising if you are going forward steer, the rake will probably be a good thing.
I am not sure that the ballistic props are much different in rake than the SRA.
Keep in mind that if you get a 13p and your revs are too high you can always have more cupping added.
Cheers 🍻
I've got a Tohatsu 30 2 stroke ...came with 11p .. swapped it out for 13p .... Goes faster top end...but big diff is revs at "normal" speed... dropped by 500-600rpm .
Yeah, sounds about right.
Great motors 👍
Awesome.. do with cleaver and chopper prop comparation speed with standard outboard engine..
Hi Mate,
unfortunately I don’t have any chopper and cleavers for that engine, will definitely put a video up if I find one.
cheers 🍻
Hey mate do stainless props with a cup use more fuel ?
Wow…. had to wait 2 months. Shows how much a prop changes things.
Hi champion 👌👍
want to let you know, you have always been such a support to this channel, thanks so much mate 👌
yeah, it’s been a while, I have been battling a health crappy thing and it has made it hard to do my normal hobby (boating - outboards whenever I can)
Hoping that I’m back into things fully soon.
cheers and thanks again mate.
Aussie Boat G 😊
Hope your felling better real soon. Love your work so happy to wait for more content when your up to it.
awesome mate another great vid good to be back mate. One question mate I have a 3.6 m flat bottom punt boat fully decked out casting deck I was planning on putting a 25hp or 30hp on it in the future I was just wondering if it can be possible or will my boat can handle with a bigger motor as right I'm running a 15hp tohatsu with mariner stickers thanks mate?
Hi mate,
not too sure on your exact boat but see if you can find a maximum hp for the hull, should be on your compliance- manufacturers plate.
hope it works out 👍
cheers 🍻
I have a 9 pitch on a murcury 15hp and it does 26 by myself if I put a 11 pitch on would I gain any speed from it?
Hi mate,
Maybe but maybe not.
It depends on what boat it’s on and how heavy the setup is, how many revs your doing at full throttle with the 9p.
Prop pitch is a bit like changing gears in a car but the car is going up a hill (because of a boats drag)
9p might be the perfect gear but 11p might make the motor struggle and slow the revs so much that you loose speed.
In saying that I always like to try props out so see what performance difference they have but going from a 9 to an 11 on a 15hp unless it is over revving may be a bit much.
Also keep in mind if you raise pitch you will have a slower take off too.
Cheers 🍻
Aussie Boat Guy 😎
What do you think of the fish nipper? I have a new Mercury 20 with the new centre position tiller and wondering if it would suit? Current boat wants to tip me out as I can’t distribute weight well enough
I’ve got a few videos (review) on the fish nipper on the channel if you want to see it in other conditions etc.
I really like the fish nipper and it is the most stable 3.5m tinny I have been in.
I am 80kgs, sit in the starboard stern and have a 12 liter fuel tank port stern, if I was heavier it may change things but I’m sure I would position things to suit.
Yeah, I guess the centre tiller moves you about 150mm further starboard too.
Cheers 🍻
Aussie Boat Guy 😎
Cant beat the 13 .... u have enough power to spin a 15 no doubt
Hi mate,
Yeah I reckon it would spin a 14p or 15p for sure and if I find one I would love to see what it does.
All the best,
Aussie Boat Guy 😎
Yes I would have liked to see 13p 4 blades prop because your boat was very light. That one may have been the fastest. I think you should keep the diameter the same and go up 1 pitch and down one pitch. I think the motor could have used one pitch up it was going very easily at that pitch. Your boat is a skimmer
Hey mate I have a 3.8m tinny with a 30 hp tohatsu 2 stroke I have a stock 13 pitch aluminium prop on it it goes 62 kph and it cavitates alot. I am looking at buying either a 12 pitch stainless or should I get a 13 pitch stainless. Would you recommend the power tech sra3 or a solas stainless props.
Cheers. 🤙
Hi mate,
Yeah the stock alloy does cavitate a fair bit hey. I personally have not tried the solas props on the 30hp but from the look of them they don’t have much of a rake compared to the SRA PowerTech whether that’s a good thing or not? Normally more rake less cavitation.
As for pitch it’s a hard one as each prop manufacturer will be slightly different. Unfortunately the best way is to try them (so hard I know) and a PowerTech will work better on some hulls and the solas better on others.
Please keep me posted on your results mate, would be very interested to hear your thoughts.
Cheers 🍻
Great video gives you an idea how different pitches affect performance, I am thinking of going from a 13 pitch to an 11 with my 25hp Mercury because it's not getting on plane if it's loaded with a lot weight and/or at high altitude it already has electric trolling motor with batteries, floor ect then with a heavy passenger it's too much is there any danger of the motor overreving if you go too small with the pitch?
Hi mate, cheers.
If your boat is battling to get on the plane with the 13p then you should have no issues with the 11p over revving.
You are correct that if you go too small a pitch the motor will over rev, like when I put the 9p on my light setup.
As long as the max revs at full throttle are within the recommended range (better near the top of that range too) then it’s ok 👌.
All the best
Aussie Boat Guy 😎
@@25hpboatracerman thanks so much for your reply Wide open throttle is meant to be 5000 - 6000 rpm.I watched you other video on installing the tachometer and have ordered one off ebay the same so I can keep an eye on the rpm, that was an awesome video also showing that it's not that hard to install a tachometer
Thanks again
Alexander
You didn't give full diameter dimensions with pitch on each one, are they all 10x13 with only difference in pitch?
Just going from a 12 to a 9 on yamaha f20b 4 stroke. Was fast top end with just me but super sluggish, no plane with 3 people. Was the 9 pitch more fun?
Hi mate,
Yeah the 9p was fun but the top speed was ridiculously slow and annoying.
Can you try a 10 or 11p?
Cheers 🍻
Aussie Boat Guy 😎
hey mate, I have a 25hp tohatus and was wounding how to convert to a 30hp thanks
hey mate 👋
the only difference is the gasket just behind the carburetor, it has a smaller hole. Order a 39hp gasket and install then your golden.
cheers 🍻
hey mate
would i get more top speed if i went a 14p stainless
cheers
Possibly, you would have to try it.
If you are reaching near maximum rpm (full throttle) with a 13p and your hole shot it ok then a 14p probably wont do much apart from make getting up on the plane even slower, a bit like starting a car in second gear.
If you have a really light boat set up (empty 10ft tinny) a 14p will be great 👍
What I have seen on other setups is the top speed sometimes doesn’t change much with the larger pitch props but the rpm at full throttle is lower at the cost of hole shot and feeling a bit sluggish onto the plane.
But always worth a try if you have the opportunity 👌
Keep me posted
how would you get the max speed out of a 6hp mercury?
Hey mate,
Engine height, boat weight, propeller and trim setting also weight placement in the boat. if it is a Japan built Mercury you can add parts off an 8hp or 9.8hp.
cheers 🍻
Yea thanks mate, I’ve got it on a 3m flat bottom punt witch is ultra light and only weighs around 30kg, but I’ve heard that a 6hp Japanese like mine can go 41 on a 255 tender witch is a v nose. Do you know anything about this?
@@FR54321
Yeah, maybe , probably more in the high 30kph range.
The 6hp Japan made is the same capacity as the 8 and 9.8hp. I have seen 42kph with a 9.8hp on a small tinny.
You can definitely grab an 8hp carburetor for some more power
@@25hpboatracerman if I put a 9.9 carb in my 6 would it make it a 9.9? I’ve done some research and that’s not the case, can you tell me why?
@@FR54321
No, you can put an 8hp carburetor on your 6 and get a bit more power.
You cannot put a 9.9 carb on but you can put a 9.8hp carb on but the 9.8hp has a fair few different parts like a high compression head, I think it has different ports as well, possibly different exhaust.
Cheers 🍻