The Correct Prop For Your Boat! How To Know!
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- čas přidán 30. 12. 2019
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I went to a 4x4 prop set on my Bravo-III’s dropping 2” of pitch also. Running twin 350 MAG MPI’s. Huge difference in stern lift, less bow rise ans suprisingly less engine noise too!
Hey your video was very informative. I just re-propped my F115 Yamaha on a 22 foot fibreglass cuddy. Went from a SS three blade 17P to an alloy 4 blade 15P to gain better hole shot and more stern lift at a slow comfortable cruise around 15 knots. This helps keep the bow down so I get a better ride in the frequent 2 to 3 foot chop we get in my neck of the woods. Best economy still comes at 4000 rpm (22 knots). I only dropped 2 mph from my previous 36 mph top speed.
Happy new year from Spain. Always is a pleasure to learn with yours videos.
Great explanation. Now it all makes sense why the previous owner of the Flats boat I just purchased installed a different prop and why the boat hole shots like a champ. #cleanboat
Great info! Happy new year!
Wow. That was extremely informative. Well done. Will have to watch several times through
What a great explanation on props... good stuff
Awesome video, answered a lot of questions that I had
I bought a new Sleekcraft some years back and didn't know much about props. I had my boat at the dealer while someone was making a custom boat cover for it and someone with a boat just like mine told me my boat had the wrong prop. I changed props and it solved my cavatation problem while pulling up skier's and had a fine top end too. Today I have a Glastron I have had just 3 months. After whatching and reading your website I switched to a four blade from three. The boat has excellent take off for water sports. Being a Chevy V-8 Volvo Penta outdrive I remember their advice on the RPMs. Though it will rev 6 easily, For extended crusing keep it about 3,000 RPMS
Happy New YEAR Mate!
Man I need to move to the coast. These boating videos are giving me the fever.
Interesting video and factual. I've got a 4 blade adjustable pitch prop on my boat. I set the pitch lower for more load ( people), handy to have . One prop adjustable.
Yup perfect timing here too. Doing work on my boat trying to fix steering. Noticed problems with my top end rpm so I know I need to change the prop. Great CZcams channel guys.
#cleanboat
WHAT IF THE MOTOR IS NOT UP TO POWER ?NOW YOUR JUST PUTTING A BANDAID ON A PROBLEM....
MAKE SURE MOTOR IS RUNNING CORRECTLY FIRST
I just went from a 3 blade 21P prop to a 4 blade 19P prop on a 17' family boat (Glasspar, Merc 90CT outboard) and there were three notable differences.
You could trim further up with the 4 blade before ventilation, so a bit more top end RPM with less set towards one chine.
You have better throttle control at cruising speed. Our preferred is 3,600 RPM and the 4 blade allows finer throttle control around that range.
And we come up right now. The 3 blade was Ok, but felt a bit lazy climbing up. The 4 blade is right now : )
Oh, and the top speed did not change, so who cares : )
Same here. 4 blade big hole shot, better control same top end. Fuel economy improved too.
Good info. I need to look into this on my own ride.
Back in the day when I bought my boat and had only passing knowledge of props I learned a tough lesson: The boat dealership doesn't know a thing about props either. I did my own research, talked to Mercury and solved my own performance problems. Astonishing. I've been running a 5 blade Hi-Five steel prop for years on a carbureted 150 Merc, good hole shot and less top end speed. #cleanboat
2 things I think are important:
1) Motor height needs to be correct. Many outboards are mounted to low. Anti vent plate needs to be just skimming on top of the water at normal cruise
2) you really should be aiming for the middle point or higher of the max rpm range at WOT. hitting the lower half is marginal and easily further degraded by extra weight
I have three bladed Mirage plus on my two Mercury Verados. Very useful information, thank you Born Again Boating! #Cleanboat
I never really thought about weight making that big of a difference. Good info. #cleanboat.
#cleanboat..awesome video cant wait for the 2020 videos.happy new year!
that is good information because i was just looking for new props
When it comes to 3 or 4 blade props its simple. You want more speed/performace then go with 3 blade. You want better control, handling, more power, better hole shots with fully loaded boat then go with 4 blade.
Been working on a proper size for my 5.6 meter RIB, thanks for the help! #cleanboat
Your spot on with your information. I owned a prop shop for 9 years. And that's exactly what I used to tell my customers when figuring out the correct one to use.
Thanks for sharing
I know it's been 2 years, I hope you can still answer. Is it generally accepted that when determining your rpm at wot, you should keep the engine trimmed down?
No, you want to trip up to achieve you top speed and top RPM for that speed the way you would normally drive the boat with the amount of weight in the boat that you would normally be carrying. If you propped it for proper RMP with out lifting the trim during your run you would not be able to lift your trim during regular use with out getting your rpm’s too high.
During your prop testing, Load your boat and run it just like you would normally be using it.
Well that makes so much more sense now thank you for the good video
you are killing me smalls ...its late december 2020 and you are talking about hope your Christmas was ok i really thought i missed christmas somehow!!!!!
Two friends had identical bass boats and motors, one had a three blade prop, the other had four blades, hole shot was identical, four blade prop was one MPH faster.
Thank you for the info. Just purchased a 175 HP Suzuki for re-powering a 2100 CC Sea Pro (2004) for fishing on the Sea of Cortez, BCS. They give a standard prop with the motor. Before it had a 140 HP Suzuki which I sold. The boat is rated for a 200 HP. I will start the standard prop and hope it is a good match. You provided enough information I can kind of gauge if the prop is functioning well. Like your channel allot.
Good luck!
#cleanboat very informative I run a four blade on my twin 300 verados after watching your video my motors are running in the right range keep the videos coming
The manufacture/dealer done an awesome job on propping out both our pontoon boat and bass boat. Didn't need to change anything. #Cleanboat
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So well explained and very informative. 👍👍
I think(from watching this) I might finally understand something that's been puzzling me for some time. I have a 150hp mercury on a 20ft wellcraft w/a 4 blade prop. That was the setup when I got it and haven't changed it. Never used 4 blade before, just assumed it was like airplanes (to help balance ). Don't remember any other boats being so twitchy. Better at pushing back at waves but before you make any significant speed change warn the passengers. Never had one that practically jumps out of the water and lands on a plane like this one does. Thought it acted more like a ski boat than a fishing boat. I suspected either the prop or the development of mental illness. Thanks for the clarification, I feel better.
Ahh spun mine today on the dirty James River relaxing waiting on Towboat lol
i would love to see a video on hydrofoils and what they do for your boat and how they work
JOSH G THE OG Permatrim.com. Permatrim plates are the best and I have used most all of the others in my many years of boating. Currently I have one on my 17 foot skiff with a 90 Yamaha and one on my 24 foot Triton bay boat. It’s amazing the difference it makes.
Great video. I had to get the height of the engine right before I changes out props. My engine was too low. #cleanboat
Great information. Ty much!
Always good info
Good explanation of how to prop out a boat! Just a comment on 4 blade vs. 3 blade propping. I found my boat would reach recommended WOT rpm early with normal load on board. Also, I do a lot of tubing and kneeboarding with the kids. Since I had headroom, I switched to a 4 bladed prop to get better traction on the water for water sports. Very satisfied with performance now. Happy side effect is better handling, especially in following seas. Having an extra blade in the water really seems to help. Losing a few mph at WOT is well worth it, especially since where I boat is very rarely calm enough to boat at WOT. Not sure what the fascination with top speed is all about anyway. I’ll take the quicker hole shot and improved performance any day.
Did you change the pitch (down) when going to the 4 blade? Or keep it the same as the 3 blade? 🇨🇦
Couldn't agree more, 4 blade, two pitches down is the way to go!
@@barrybebenek8691 I went down two pitches
i put a nice four blade stainless prop on my tow boat and it cut a good three or four knots off my top speed i didnt like it put the old three back on this is a work boat and an extra four knots is good to have
The fascination with top speed for me relates to cruising speed. I like to sit between 3800 and 4200 rpm for cruise if I can. I'm looking for the best fuel economy and speed at those revs or lower, I don't really care if you beat me back she only gets about two wots a yr. We are about to get a new propeller, I have never tried a four blade, maybe its just what I need.
For acceleration Mercury Enertia, for most efficient Mercury Enertia ECO. Tried them both. Only weakness - vibration at low speed rev below 800 rev/min.
Great video! I know this was a prop subject but you failed to mention dole fins can solve out of the hole issues without changing the prop. I do say, they are ugly and lower your top speed but can save trial and error time. Haul out fees are rough.
#cleanboat ... whole shot is my pick..Happy New Prop everyone
Great video thank you for the interesting information
#cleanboat, I watched this video 5 times already, and probably will several more, this is a quantum science test almost if you take in consideration all the variables!! But you guys did a good job dissecting the subject in my opinion.. happy 2020 by the way !!!!
On a 19' sea ray wirh a 3 blade 21p, i could get about 45mph at about 5,000rpms. That seems pretty efficient based on my boat only having a 4cyl engine. I did not expect to ever get going that fast when I purchased the boat
Thanks, really good explainer.
So helpful, i am glad i found this video. thanks
Thank you for confirming what I was thinking. I had to replace a prop last season. It was the first replacement in about 10 years. I let the shop know i was struggling with planing when the family is on-board. He switched me to a 4 blade and i cannot believe the difference. The top end speed is lower by about 3 MPH but the hole shot is 5 seconds faster with everyone on-board. watching your video today during the discussion of the added weight that my kids are all adults now and have added weight to my boat. Switching from 3 blades to 4 made the difference.
Good video, but one point you described incorrectly was about the prop vent holes. These are to allow for exhaust gasses to escape around the prop during holeshot to allow the engine rpms to increase. As well as having little to no effect once on plane.
That's a good starting point. BUT you can have 2 three blade props with a different blade shape one will be better. The weight of the boat makes a difference. My boat is really light to the point I take on fuel as ballast in rough seas so it doesn't tip over, loading when out of fuel I have to stand in the middle to load it,. So I use an aggressive 21p meant for an IO.
Great videos! Would you please consider doing one on descaling an outboard, such as by flushing with Barnacle Buster or any of the other similar chemicals, or whatever method you think works best?
Let's stop all the bullshit... in today's buying Market most dealers are going to make you buy two or three props to get it right they're not going to give you $500 props to try... 80 years old mom had me on a boat before I could walk LOL 'Nuff said!!!... thanks for posting
Music to ears thank you boss
I really appreciate the fact that you use the proper term, "engine".
@@SeanPennII incorrect sir.
Now I know how to race thanks great tip
Man I've watched a lot of different prop videos and boating videos in general and none of them come close to the ease of understanding and clarity of explanation. Very helpful because I am upgrading my prop right now and this video just put me right where i need to be.thank you. #cleanboat
Great vid 👍🏻. I had a major issue with ventilation as my boat has a 20” motor vs the required 25”. The 3 blade aluminum prop would ventilate real bad as soon as the boat came on a plane, and since my motor was already installed on the lowest setting I had 4 options: convert my 115 mercury to a 25”, cut my transom and drill new holes, add an engine bracket, or changing to a 4 blade SS prop with some decent rake. Swapping from a Black Max 3X13X19 prop to a Solas SS 4X13X19 was my solution and has eliminated 95% of my ventilation issues. Boat runs perfect now, comes up on to a plane real fast and my top speed has gone from 33mph to 46mph. #cleanboat
N M
What kind of boat? I have a 115 Mercury 4 stroke, on a 19’ Mako Skiff.. Stock aluminum prop, thinking of SS.
edwardnelson6
Hi
It’s a Sportsman -Island reef 19ft. I already had the motor (2013 model) and the dealer said that the 20” motor would work great with that boat. So bought the boat from Florida and shipped it to HongKong, then found out it was too short, and that’s how I ended up going with the 4 blade SS.
I would recommend the switch to a 4 blade SS for overall performance, but if the standard one u have works well then it might not be necessary to change. Would be great if u can test a prop before you buy it allowing you to make a “PROP”er decision.
Great video!
Just bought a boat and DM’d you on instagram! This is the prefect video being that the prop is the next thing I have to replace #cleanboat
Pretty concise information there Aaron but theres also blade shape and whether you tow as well good vid though Happy New Year mate 🇦🇺
Happy New Year! Yeah, I had "talk about cupping" written down, then it just never got into the video lol
@@BornAgainBoating😃 not to worry i actually thought you mightve forgotten to mention it maybe caught up in Pre NYE party mode 🍾🥂🎆
Great vid! Thank you very much! Can you add some information about props for sailboats? Arround here, we sail in a wide river with pretty strong currents. Those two blade props just can't do the work. Many change the 2 blade for a 3 blade. Would you think a four blade would do better? Thank you very much anyway.
The more the blades, the more grip and handling. The 3 blade is probably fine but a 4 blade would give you that extra grip :)
Nice video. Thanks.
Just taking a chance, and taking this same chance on a lot of forums as well. I have a 1970 Mercury 1350. Finding a prop for this engine is a headache and a half. It's got a 3 blade prop on it now, but would love to go 4 blade on it. It does feel like the current prop I have is a tad to big for the engine as it struggles to get on high RPM when pulling someone on Ski's. It almost sounds like it has a dead spot, but after watching this video I think I know what the issue is. Prop pitch might be to high. When not pulling I have no issue with the prop and the boat really jumps out of the water.
You don't maybe have a link to a website or any specs on which 4 blade prop would work on this particular engine?
Truly enjoyed the video!! Great topics. #cleanboat
Have a 19 ft cuddy. 5.7 Chevy. Went from a 15 17 to a 14.5 19. What a diff. Better mid range n more top end. N a wicked holeshot. The prob lasted one trip. So excited on performance that I forgot to lift out drive n it didn't like cement. Fubar... lol
Ouch!
@@BornAgainBoating oya. 170 down the pipe. Bam
1990 whaler walkaround WD ( whaler sea drive bracket) with twin 1993 200 hp yamaha precision blend 2-strokes , running 14 1/2 x 17's 3 blade stainless steel yamaha props, 225 gallons of fuel, gear, turns 4800 with engines down WOT with 3 heavier people (approx 850 lbs) , trims up to 51 to 5200, tops out 38+ to 41.2 knots depending on the trim and current. I believe it is set up correctly. Cruising 26-27 knots at 4k-4200. Put on a pair of the SE400 hydrafoils which are great no more or very little if any ventilation in a rough sea / fast current. Love the engines and Hydrafoils were a great investment! I wonder what she may cruise at / or/ WOT WITH TWIN Suzuki 300 dual props?
Another video that makes me wanna do a day camp there. I wonder of my C340 has the best prop setup. I've had it at 50mph WOT mid to light chop. And it gets about 1.2 mpg at 32knts (I need to double-check that again) #cleanboat -but if I win I'm gonna donate it to another of your subscribers 🤣. I don't do the cleaning
Back in the day, when I was a kid racing a three-point hydro with a Mercury Mark 20H on back, two-blade props were the way to go. Took longer to get on plane but once there would easily beat a similar boat with a three-blade prop. The trick was to get the right combination of pitch and diameter so the engine could rev higher.
Great videos ❤️
One more thing I have noticed on my last two boats. There in-board/out-boards. The tach is almost exactly what the RPM reads.
THATS WHAT THE TACH DOES LOL YOU MEAN SPEEDO?
Great video, were on this mission currently with our 4.3 merc alpha 1 #cleanboat
What prop did you go with I have a 20 foot with omc 4.3l and my prop is a 14.3x21 and I'm thinking of going to a 4 blade to get out of the water a little quicker
Excellent video...
Good information, Happy New Year #cleanboat
I run a 4 blade stainless prop on my Suzuki DF175 on my pro sports 2000BW it’s gets up on plane like a champ I have a spare 3 blade onboard never thought to compare the difference #cleanboat
Hi, I’m wondering if the manufacturer picked the wrong prop for me. I have a 25’ step hull with a 23p factory stainless steel prop. It’s a LH prop with leaning to port most of the time with balancing issues. The battery is on the drivers side now. My last passenger was about 25lbs heavier than me and it was still leaving more so to port. Do I need a RH 23p stainless steel prop? Or a skeg anode slightly turned towards the driver side? The current anode is just flat. Maybe trim tabs although I don’t want to effect top speed if possible? Maybe a cavitation plate???
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Thanks for sharing such videos for informing us. I also suggest that sharing info about refitting a boat. So we can deride whether buying a new boat or refitting an old one. Thanks...
What is the difference between running an outboard verses and IO verses and inboard. I notice boats in Florida run multiple outboards while in the Great Lakes we tend to like I/Os or Inboards. We are looking for a new boat and i really would like a center console with an Inboard so the boat will run flatter through the water with the engine being more forward. Am I crazy? They are very hard to find.
Born Again Boating i mean does it worth refitting an old boat than buying a new one? Especially wiring and refitting interrior design are a way to have a new boat?
@@alibilgutay6004 .....
How about a video on how to get a boat on to the pad
Thanks for the info. I've been researching the difference between the 2 and from what I've seen, I'd rather go with 4 blade prop. I like how you can get on plane faster, stay on plane at lower speeds, and have better control. Top end speed is not a big deal to me. Especially if it is only 2 mph less.
I tried a 4 blade and found out the 3 blade was better. Maybe because it was in a river, but the 4 blade felt like it struggled when the 3 blade was smooth.
Does anyone have prop suggestions for a 2021 Trophy T20CX with factory 150hp 4 stroke? Sorry but I just bought this boat and don't have the engine specs.
What size prop will you recommend for a speed boat (25ft/28ft) having a Yamaha 250 with a max allowed speed of 60 mph and 3 race crew members , and a fuel capacity of 120 litres.
And don't forget that changing your prop and pitch will also change the how quickly you get up on plane and speed at idle. I'm not sure if the speed to cruise at plane is different, but i do know the rpm is different on my underpropped 4 blade (14x17x4) versus my correctly setup 3 (14x19x3) blade. I'm sure this affects my mpg (or gallons per mile for you big boat guys). my idle speed dropped from 5mph to 3mph, which means i usually have to give my 4.3L v6 a little throttle while in an idle zone. [1992 Chapparel 1900 19']
It can get a little tricky if you repower a bpat designed for 2 strokes with four strokes. Only tried on boats with up to 3 engines personally, but jeeze it can get expensive buying the different props for each trial and error. Especially if the hull has a huge step as well. That seemed to add another big variable. Maybe if you repower, you should leave a reserve of like $1k per engine for propping.
I recently changed my prop for my 2012 yammy 2 stroke. Its like a whole new motor. Gets out of the hole quicker, lower rpms for same speed and way better fuel economy. I wish I replaced it years ago #cleanboat.
Is that Townsville FNQ?
@@profthomason the one and only Brownsville.
Outlaw Oosers High Performance Tillers on facebook. Cool group.
#55
I'm running a 525SC built to 600 hp at the crank on a 1985 Carrera elite. I am running a bravo 1 outdrive with a nose cone and low water pick ups, a drive shower and external hydraulic steering. I have been running a 26p 4 blade. It gives me a great hole shot and gives tremendous stern lift. I experience mild porpoising from 20-30 mph but once I reach 30 I can drop down in speed w/o porpoising. I tried a 3 blade 27 pitch propand it eliminated the porpoising and gave the boat the ability to make sharper turns at 30-40mph, but the hole shot was slower and the prop would blow out if you gave it to much power on the hole shot. Running in the 50-55 mph range I was experiencing more prop slip with the 3 blade prop. I had less stern lift. I have yet to be able to run at wot. The engine isn't getting enough fuel
When pushing 3900 rpm it will start to backfire. We are leaning to the in tank pickup lines being to small of a diameter. The boat originally had a Volvo Penta 290A setup and the fuel tanks and pick ups are original to the boat.
I guess the point of all of this explanation is that in my case so far, the four blade runs faster than the 3 blade at the same rpm. I don't know if this will hold true when I can get to 5200 rpm.
I would love to hear back from anyone that has ran a similar setup on a Carrera elite.
Most of the time people running a race engine like that have a 5 blade prop on it, but it all depends on what you are trying to do.
@@BornAgainBoating right now with the 4 blade I have a slip rate of 7 at lower speeds 20-40 and 5 at higher 40 up to 62 mph at 4000 rpm which is the fastest I've gotten because of fuel delivery problems. The in tank pickups are original with the boat and I think the diameter is to small so we will be changing them out this winter. One other thing is the weight of the boat originally as listed in nada was 2300 lbs. I did compare that to a donzi classic 22 which listed in nada at 3500 and on donzi's site list it at 3725.
My mechanic said that we gained no more 80lbs because the bbc weighed more than the sbc, but the bravo 1 outdrive was lighter than the Volvo Penta 290.
Carrera went out of business in 2002 and was bought out by aftershock that also went out of business, it is hard to find exact specs on my boat. This is not Carrera power boats out of Florida. My boat was manufactured in California. My center line of prop is 5 1/2" below the bottom of the boat. My mechanic said if I wanted to go strictly for speed he would have brought it up another 1". We use the boat mainly for recreation, water skiing, wakeboarding and pulling a water rocket for the grandkids. I also like to take it to lake Powell. With my old setup. My rpms would about match my speed, 3500 rpm, 35 mph however at 5200 rpm it would be about 45-48. Now I can run at 45 mph at just under 2900 rpm. As it sits right now, I am not running any trim tabs and the boat handles extremely well. That may change as we get the fuel supply problem figured out and the speed increases.
Also reading about 5 blade props I came across this. www.mercuryracing.com/prop-school-part-5-blade-efficiency/
We did raise the x dimension, but I don't have a stepped hull
and my prop is not running totally surfaced if it's piercing the surface at all.
What about buying an aftermarket prop vs buying OEM? Does it really make a difference in performance?
#Cleanboat Another great video. I went through the prop selection process with my boat a couple years ago. My boat is now propped exactly as described in the video. Alone with light fuel and no trim I can touch the rev limiter. With a normal load of fuel, people, and gear I can still achieve max RPMs near the top of my manufacturer's suggested rev range. I also went from 3 to 4 blades since my boat required stern lift. Hole shot and mid range are amazing with any load and I only lost 4-5 mph on the top end overall.
Thanks for giving me an idea on props for our little tinny👍🏻
#cleanboat
Very good info brotha. #cleanboat
A good rule of thumb I have always used is, just me in the boat, 1/2 tank of fuel, no gear and just barely kissing the rev limiter when fully trimmed at WOT.
just what i was looking for for my new motor #cleanboat
I have a ski boat with a beat up old 13x13 prop 3 blade and it seems to not Rev out to the right rpm. The engine in a 305 and tired. The original engine was a 350 with a 13x12 3 blade.. so my question is if I put a 4 blade what pitch should I try first. I was thinking a 12x12. I never use wot because the motor is tired. I want to cruise at a lower rpm and get good mpg.. but also be able to pull big people up out of the water as I struggled a bit with a 250lb skiier.
Thank you very much.
Welcome 😊
I’d like the optimum pitch to achieve max endurance at min plane speed plus 3 kts. My diesel like to sit at 3800rpm doing 16kts with current prop ( max is 4500 at 24kts but diesels don’t like being run high rpm)
thats odd...because i have a 40' post with twin 6v92 detroits and she is most efficient 200 rpm's below WOT(2100)
Clear as mud 👍
At 4 minutes you talk about the vents on the prop I thought they where there for some exhaust to escape to help ventilate the prop a little at lower speed.
Nice video ## clean boat
Link to the Prop Selector site, please.
Hi. I have a 2003 wellcraft 250 fisherman with 250 Yamaha hdpi. Would you by any
any chance know which prop would be best for my setup? I don’t understand this stuff and can really use your help
Roland
#Cleanboat See you next week! Awesome video.
we have a 90hp jhonson with a 4 blade 14 pitch prop
What about use 4 props? Could you use 2 different sets of props?
Can you get a variable pitch prop?
happy new year. #cleanboat
Great job
Thanks!