Simon, some of your announced values must be wrong. Your gear ratio is 1,92. 11P 3 blade prop 6300 rpm and 52 kph. That´s a prop slippage of 5 %. 11 P 4 blade prop 6300 rpm and 45 kph. That´s a prop slippage of 18%. The 4 blade prop grab´s the water much better than the 3 blade prop with similar pitch. You know about that too. My rib is equipped with an Tohatsu 30 hp 4 stroke. It´s the same engine like yours. With my 3 blade 13P prop i run 49,5 kph, and with the Mercury Spitfire 4 blade 11P i run 48,5 kmp with higher rpm. Spitfire is a top prop! No cavitation issues, and very quick acceleration and quick holeshot.
have the same motor in 25hp, you need to trim out more until that V shaped spray has gone, you'll plane better and pick up a tad more speed. Just remember to trim back down to take of from the hole shot
The spitfire prop pulled much stronger than the 3 blader and caveated a lot less. I ran that motor quite high (probably a hole higher than it should have been). The spitfire was definitely slower which was a surprise considering the marketing material on it but it was a better prop for the boat.
Hi mate I've got a 30hp 2 stroke Merc and I was wondering if you knew much about what prop is best to run on one of those. Bigger or smaller, stainless etc?
Hey Mate, Nice set up. I bought a 390 quintrex with a 30hp merc four stroke Any tips on set up (prop selection etc) would be mostly appreciated. I generally run lightly loaded 2 blokes and a bit of gear, but every year a dozen or so of us load up or tinnies to the max weight and go camping for a week down a river moving camp every night. What would you suggest would be an ok prop to get me up on the plane better when fully loaded?
Simon, Are you sure about those speed figures? 45km/h with the Spitfire prop and 52km/h with the 3 blade 11 pitch? Mercury claims no loss in top end speed with the Spitfire prop when compared with the 3 blade.
30 fourstroke Merc is great, its heavier than the Yammie 30CV but 20kgs lighter than a Yammie 30 fourstroke. Its power delivery is fine if you prop it right and its much more user friendly than the 30CV but in saying that it is also twice the cost. This one is a 2006 which is still a current model.
I want to install this on my zodiac it will take up to a 30 I just want to know. and can not find anything online of how big my transom plate needs to be I have a 14”x 11” transom plate What is req for your motor thank you
Weird, I have the same engine, 30hp merc 4 stroke 2009 mounted on a quicksilver 430 sport inflatable (alu floor) and it runs 43 km/h at max with just one person in it. Compared to your boat and packing which is much heavier, I should be able to go faster...
William Larsen an aluminum boat has les recistance in the water as a inflatebel boat I have a zodiac with 15 hp and a friend of mine has a aluminium boat with 5hp and he goes the same speed as me
1greghawk ,I absolutely agree with you,the suzuki is a powerhouse compared to the merc,136lbs compared to 160+lbs at it's lightest for the merc and they are dogs out of the hole. Now the new 25/30hp merc/tohatsu has a new gear ratio that can push a bigger prop which should of been done from the get go. The new efi 4 stroke yamaha looks promising also at a mere 126lbs which is insane light for a 25hp 4 stroke outboard.
yeh i bought my boat recently from a yamaha dealer n my suzuki df20a from another dealer. the yamaha salesman did tell me about the upcoming lighter efi 25hp but wasnt due to be released til about this april .The current 25hp carby yamaha is a heavy dog compared to the new suzuki's
I think the Proline Anglers are around 100kgs heavier than a basic Proline like this one but these Merc/Tohatsu 30hp fourstokes with the right prop would work okay, you will just loose top end compared to a two stroked prop'd to equivalent holeshot (I found the Merc Spitfire 4 blade alloy prop worked well). All of the EFI four strokes I've owned (Merc 30, 40, 150, Honda 90 with BLAST, Yamaha 60) definitely don't have the very low down punch of the equivalent HP two strokes but they are a million times less cranky than a carbie twostroke motor and still noticeably smoother than a DFI two stroke.
If set up correctly of course you can run for extended periods at WOT. If there was an issue with it the manufacturer would set the rev ceiling lower. In saying that, running at WOT while having the motor over propped with too larger pitched propellor would cause issues over time however even under those circumstances it would still take many hours before a problem presented itself.
Simon Hall Well, seen from another perspective, most four stroke outboards have the the same technology as car engines. Cars are driven in different gears, which makes it possible to drive at high speeds even with a low rpm. If you run a car engine at high rpm for a long time, there is a very big chance it will be blown or defective. I own both 4stroke and 2stroke outboards myself, and always have this in mind when I use the 4stroke.
Yes but car engines run much hotter, generally 90 degrees C compared to 50 degrees C for a four stroke outboard. Look at a house boat as an example. I'm know an operator who has a fleet of them that weigh upwards for 40 tonnes each and they run two 60 hp Merc fourstrokes which are constantly operated at WOT throttle. The serviceable life of those motors is generally between 5000-6000 hrs. It's not a problem for them.
+WarthDader74 you can only achieve max rpm if you rev your motor in neutral, or if its out of the water, when your outboard is up and running through the water your prop has to push all that water out of the way so the motor is going to struggle to reach anywhere near max rpm, even if its at wide open throttle
jack masters That depends on if the motor has a rev limiter or not. Running an outboard at WOT in neutral is anyway not a smart thing to do. It will be destroyed in a couple of minutes.
Simon, some of your announced values must be wrong. Your gear ratio is 1,92. 11P 3 blade prop 6300 rpm and 52 kph. That´s a prop slippage of 5 %. 11 P 4 blade prop 6300 rpm and 45 kph. That´s a prop slippage of 18%. The 4 blade prop grab´s the water much better than the 3 blade prop with similar pitch. You know about that too. My rib is equipped with an Tohatsu 30 hp 4 stroke. It´s the same engine like yours. With my 3 blade 13P prop i run 49,5 kph, and with the Mercury Spitfire 4 blade 11P i run 48,5 kmp with higher rpm. Spitfire is a top prop! No cavitation issues, and very quick acceleration and quick holeshot.
have the same motor in 25hp, you need to trim out more until that V shaped spray has gone, you'll plane better and pick up a tad more speed. Just remember to trim back down to take of from the hole shot
The spitfire prop pulled much stronger than the 3 blader and caveated a lot less. I ran that motor quite high (probably a hole higher than it should have been). The spitfire was definitely slower which was a surprise considering the marketing material on it but it was a better prop for the boat.
Hi mate I've got a 30hp 2 stroke Merc and I was wondering if you knew much about what prop is best to run on one of those. Bigger or smaller, stainless etc?
Thanks for the video was thinking of getting one for my 3.9 stacer seahorse should be a good match up
My cousins friend has a 30hp mercury fourstroke on a 16 ft war eagle with a 4ft bottom and it does 39 mph...quiet but powerful....very fuel efficient
Any idea what prop he is running ?
Hey Mate, Nice set up. I bought a 390 quintrex with a 30hp merc four stroke Any tips on set up (prop selection etc) would be mostly appreciated. I generally run lightly loaded 2 blokes and a bit of gear, but every year a dozen or so of us load up or tinnies to the max weight and go camping for a week down a river moving camp every night. What would you suggest would be an ok prop to get me up on the plane better when fully loaded?
Nice boat
Simon, Are you sure about those speed figures? 45km/h with the Spitfire prop and 52km/h with the 3 blade 11 pitch? Mercury claims no loss in top end speed with the Spitfire prop when compared with the 3 blade.
Hey Is that a 20”lower or 15 .and power trim or gas powered trim
The 2021s have trim assistance but dont think you can use under way thanks
Just a question mate, what is the Tinnys weight. Love the vid if you can film another test it would be lovely cheers
30 fourstroke Merc is great, its heavier than the Yammie 30CV but 20kgs lighter than a Yammie 30 fourstroke. Its power delivery is fine if you prop it right and its much more user friendly than the 30CV but in saying that it is also twice the cost. This one is a 2006 which is still a current model.
Efi or carb?
What’s your propellers pitch? Its very speed for 30 hp motor.
I want to install this on my zodiac it will take up to a 30 I just want to know. and can not find anything online of how big my transom plate needs to be
I have a 14”x 11” transom plate
What is req for your motor thank you
Yamaha 25hp 2st on a 399 will work very well. Ive seen as small as a 15hp 2st push them along fine.
Yep no swell here - Brisbane Water NSW
Team Merc!!!!!!
Motor was made by Tohatsu of Japan .
I think all Mercurys up to 30hp are actually a rebadged Tohatsu in Japan (i.e. very good)
How about you opinion if i used Yamaha 25 HP 2ST with Stacer 399. It's ok or not.? Thanks.
Get tha dog!!
Is that a 2012 model??
cool
Weird, I have the same engine, 30hp merc 4 stroke 2009 mounted on a quicksilver 430 sport inflatable (alu floor) and it runs 43 km/h at max with just one person in it. Compared to your boat and packing which is much heavier, I should be able to go faster...
William Larsen an aluminum boat has les recistance in the water as a inflatebel boat
I have a zodiac with 15 hp and a friend of mine has a aluminium boat with 5hp and he goes the same speed as me
William Larsen
Which one is your favorite motor Yamaha 2-stroke 30hp or Mercury4-stroke 30 hp??
suzuki four stroke all the way, lighter, and EFI
1greghawk ,I absolutely agree with you,the suzuki is a powerhouse compared to the merc,136lbs compared to 160+lbs at it's lightest for the merc and they are dogs out of the hole. Now the new 25/30hp merc/tohatsu has a new gear ratio that can push a bigger prop which should of been done from the get go. The new efi 4 stroke yamaha looks promising also at a mere 126lbs which is insane light for a 25hp 4 stroke outboard.
yeh i bought my boat recently from a yamaha dealer n my suzuki df20a from another dealer. the yamaha salesman did tell me about the upcoming lighter efi 25hp but wasnt due to be released til about this april .The current 25hp carby yamaha is a heavy dog compared to the new suzuki's
hey mate i have a stacer 399 proline angler with a 30cv will this 30hp merc be under powered i usally take 3 guys with me?
I think the Proline Anglers are around 100kgs heavier than a basic Proline like this one but these Merc/Tohatsu 30hp fourstokes with the right prop would work okay, you will just loose top end compared to a two stroked prop'd to equivalent holeshot (I found the Merc Spitfire 4 blade alloy prop worked well). All of the EFI four strokes I've owned (Merc 30, 40, 150, Honda 90 with BLAST, Yamaha 60) definitely don't have the very low down punch of the equivalent HP two strokes but they are a million times less cranky than a carbie twostroke motor and still noticeably smoother than a DFI two stroke.
Simon Hall Nice tinnie!
Лодка без самоотливного рецесса...очень странно. Мотор по высоте не выставлен.
You are not supposed to run an outboard like this at max rpm for as long time as in this video.
If set up correctly of course you can run for extended periods at WOT. If there was an issue with it the manufacturer would set the rev ceiling lower.
In saying that, running at WOT while having the motor over propped with too larger pitched propellor would cause issues over time however even under those circumstances it would still take many hours before a problem presented itself.
Simon Hall Well, seen from another perspective, most four stroke outboards have the the same technology as car engines. Cars are driven in different gears, which makes it possible to drive at high speeds even with a low rpm. If you run a car engine at high rpm for a long time, there is a very big chance it will be blown or defective. I own both 4stroke and 2stroke outboards myself, and always have this in mind when I use the 4stroke.
Yes but car engines run much hotter, generally 90 degrees C compared to 50 degrees C for a four stroke outboard. Look at a house boat as an example. I'm know an operator who has a fleet of them that weigh upwards for 40 tonnes each and they run two 60 hp Merc fourstrokes which are constantly operated at WOT throttle. The serviceable life of those motors is generally between 5000-6000 hrs. It's not a problem for them.
+WarthDader74 you can only achieve max rpm if you rev your motor in neutral, or if its out of the water, when your outboard is up and running through the water your prop has to push all that water out of the way so the motor is going to struggle to reach anywhere near max rpm, even if its at wide open throttle
jack masters That depends on if the motor has a rev limiter or not. Running an outboard at WOT in neutral is anyway not a smart thing to do. It will be destroyed in a couple of minutes.