How to choose right prop for your boat and motor

[@clintward8569]

I just read 20 forums and watched 5 videos on proper pitch and Rpms and finally a video that nails it on the head in 2 minutes! Awesome job!

[@paulwilliams7362]

I completely understand what he is saying. Now my question is at what on board weight should I make that decision. With 2 people im slightly over 6000. Roughly 6200. With 4 I’m at 5600. Should I go up in pitch or am I already at that sweet spot?

[@coachmen8508]

That's the best simplest most straightforward easily understood explanation

[@pospouris]

I bought a boat with an unknown history. It's a 195 sundowner and my suspicion is that the engine has been changed from a 4.3 to a 2.5 but they kept the original stern drive with a low ratio and the propeller that was 15 1/4 x 15. The engine heated and struggled to reach 4000 rpm in a calm sea. I experimented by reducing(cutting) the diameter of the prop from 15 1/4 to about 14 inches and i saw an immediate change. the engine could reach wot without getting stressed and the boat reached higher speeds of course. I now ordered a 13x15 four blade and I can't wait to try it out. sometimes you should consider diameter as a form of change. I'm told that an inch in diameter is 2 inches of pitch. not sure though, have to ask the experts.

[@TrumpsEarBandage]

This is true, diameter alone has more of an effect than pitch alone.

[@jimquantic]

But looking at the chart which shows which prop is correct for my boat, it shows so many different pitches, from very low to very high. Short of trying one on the water--nope, that' wrong, getting another and another until I get the specified RPM's?? Surely there must be some way to ESTIMATE the pitch, to be close out of the box, right?

[@საქართველოGEORGIA-e3b]

Hello, I have a Yamaha 250 HP engine. What number of propellers should I buy to make the boat faster?

[@robertlawson1184]

Best explanation ever! Thank you!

[@federicoferreyra5471]

I have a Tohatsu 40 hp 3-cylinder 2-stroke since it is a boat 460 meters deep semi-vy with 3 people plus day fishing things it does not go beyond 5200 rpm, propeller 10 1/4 14........ .should I take a step down? could you change x a propeller 11 1/8 13? I appreciate information! thank you

[@RonTrovatoRealtor]

excellent information - finally some one knows his stuff - thanks buddy

[@marvinnickels7440]

I have a 2023 190 tracker with a pro zs 115 I'm turning 6000 rpm and the motor is bolted in the top hole so it is as low as it will go! My question is it blows out without really lifting the bow! Running 43 mph GPS with tournament gear and partner! Do you have a suggestion on a different prop and setup to get more speed? TIA

[@72west72]

What would be the best prop for my helipropter?

[@ThePrestige4u]

Best explanation yet !

[@chadhunts6202]

Here is my problem, avoiding Blowout (Ventilation) when pulling a tube/skier and turning, WOT was fine, but I went from a factory mounted 4 blade 13 5/8x19p Spitfire and now trying a 5 blade SS 13 1/4x17P and adding a Hydrofoil hoping for more bite in the turns, lower plane speeds, and harder out of the hole. My only concern is a friends boat that is similar seemed to do best with a 14x15P 3 blade SS. I hope the 5 blade provides alot more bite like they say it does

[@knifesharpeningnorway]

I have a 2018 mercury 100 hp command thrust with today a black max aluminium 17p that slips on the water under hard accelration or trimming out on the outboard. I bought a slightly used mercury vengeance 19p can i use the samme flo torq ii hub kit i use on the black max on this vengeance prop?

[@boardnamona]

So im running a 13 pitch on a honda bf50 at 6100 rpm and struggles to get out of the hole with 2 people at the back should i go to 11 pitch or 15

[@jeffdege4786]

Does propping for top speed always give you highest efficiency at low speeds? I can see how a sailboat auxiliary might care more about fuel efficiency at low speeds than top speed - which is always going to be limited by hull speed anyway

[@Mroswaldo16]

We have a vmax series 2 250hp. We have a 4 blade 24 pitch. At wot it reach around 5400rpm. 61mph. Engine specs states 250 at 5500rpm. So 5500rpm is the max rpm? To see if my boat is overprop. Just got a 3 blade 24 pitch. Didnt stay at WOT throttle for long. It just reach 61/5400rpm & let go.

[@markgc65]

Hi w hat about a (4 - 6mph) 26ft canal and river cruiser ? should i prop up on 30hp efi tohatsu outboarsd, at present max rpm is 4200rpm WOT, normal cruising RPM is 2600rpm, I have standard 9.8 x 13" prop will using a 10 x 9 " save fuel or waste it ? just wondering ?

[@babtey]

Finally a simple explanation, thanks for the video.

[@dariuslondon7747]

i realize I am kinda off topic but do anybody know of a good place to watch new series online ?

[@chaimlouie1680]

@Darius London Lately I have been using FlixZone. You can find it on google :)

[@MrCountrycuz]

my f70 yamaha is winding out at 7000 rpm with a 15 pitch oem that was recommended to my by a dealer. top speed was 32 mph on a 18 foot carolina skiff jvx cc. I just ordered an 18 pitch prop to see how it works out.

[@BigBill317]

How's she doing now?

[@atheerismail1838]

Hi i just bought a boat it's my first boat maxum 2300 sc with 7.4 v8 bravo engine with 21 propeller do you think this prop enough for my boat or i put another one? Thank you

[@arneberntsenab]

Atheer Ismail

[@ileanajude8851]

Hi, I have a Stainless Steel Michigan 2Y92 SSM - 354 - C , 15 1/2"x18 RH 3884 , 1 1/16" Shaft, can you please tell me on what Boat Motor this Stainless Steel Prop. will fit. Thank you.

[@steve123261]

I just bought a boat and im way over proped. geting 3500 rpm wide open and takes forever to get to plane. Is a 4 blade better than a 3 blade? Aluminum or stainless?

[@zergelol]

Have you figured out? I am in the same position now and trying to find a solution

[@steve123261]

@@zergelol i put on a 4 blade spit fire prop. hole shot is amazing and barely lost any top end speed. I was at the point the boat slowed down on turns not any more.

[@pedrocaceiro3936]

Ok now i know. Very well explained.

[@wewntr2193]

Hi sir. Do u have propeller racing for yamaha 15 hp??

[@jorgeramos1875]

I have a 3008 cartepillar Marine engine diesel 320 hp not sure what propeller to get ??

[@FrankAiello-t8h]

I have a 2022 suncatcher platoon boat with a Yamaha 90 VMax motor want more speed I have a 14-K by 13 1?8 stainless steel prop now

[@ussweeneyd]

So, if I’ve bought a used outboard for my boat, how do I verify exactly “which” pitch to buy WITHOUT having to try different pitches?

[@lachlanoneil8938]

you cant know exactly but if you are hitting 5500 with a 21 and you want 5800 try a 19 or 17

[@cjharrin]

My same question also. Where should you start?

[@galaxyelectrical5883]

Good afternoon just wanted to reach out I am having an issue I am running twin Yamaha HPD i's 21 pitch props only getting about 4200 rpm any advice on what size prop is the correct size?

[@keanur6541]

1prop inch = 200rpm so you need to get 1400rpm to reach 5600rpm. That wil be a 13 prop you need. Im assuming reason for your 4300rom is because the boat is heavy/loaded. A 13 prop wil get you 5600rpm but it migh reduce speed because your boat seems to need torque to get going rather overall top speed.

[@LuisRivera-gt7yp]

I’m in a 1810 Nautic star dry weight is 1,275 I usually have 4 people on boat I turned 5400 5500 rpm hot 40 mph I felt like it takes a lily toe long too plane out and I have a 115 Yamaha 4 stroke. It says I can reach full throttle rpm range 5300-6100 rpm how can I squeeze more performance out of my motor I’m running a Solas aluminum 3411-130-19pitch??? I would like too know what u recommend?

[@TrumpsEarBandage]

If you mostly run heavy I would pitch down a couple inches

[@Goathead85]

Perhaps I missed something, but I didn't hear him state what pitch you should buy for a given engine. One would think they would know exactly what prop would/should work for a specific motor. Are we to understand you just go buy several props at $700-$900 apiece and see which one works best!? Every forums I read there seems to be total confusion regarding props and speed. If anyone can enlighten me I would appreciate it!

[@TrumpsEarBandage]

First thing is to install a tachometer and run the boat in the configuration that it will most often be in. Run at wide open throttle and get that rpm reading. If your motor is rated for 5-6k rpm and your only getting 5100, then you need to pitch down to raise rpm’s. The goal is to match the prop to the rated output of the motor. Weight and weight distribution will have the most effect on finding to sweet spot.

[@brianchisnell1548]

You prop the boat, not the engine.

[@jamessimmons198]

I recently had my 1995 mercury mariner 200 EFI in the shop. I had Giles’fuel pump rebuilt Reed’s put in it and water pump and seals. This boat usually carry me my passenger and all our stuff at 69 miles an hour upper River in the wind. I get it back from the shop and I have to make it get up to 61. Mile per hour I take it back to the shop. The timing was off at 17° so he said it at 21 now. I am only getting 64 miles an hour. I have lost 4 miles an hour. I’m not sure why anyone could tell me what’s going on. I would greatly appreciate it.

[@buithikieu2446]

The video sound is pretty good, beyond my imagination

[@PontoonPilot]

Heres my conundrum... I had a 15x17 mercury prop on my boat when i bought it used with only 50 hours on tge entire boat and yamaha 150 outboard 4 stroke motor. (2011 Southbay Tri-toon 24'). I was getting easily 5800-5900rpm and 40mph (give or take a coiple mph depending on water conditions and fouling on pontoons causing drag..) that prop was knocked up a bit.. so I bought a new one.. same size and pitch 15x17. Yet cant get over 4900 to 5000 rpm trimmed out! And maybe 32 mph.. (recently 28mph due to dome algea growth on pontoons) but even clean.. wasnt getting more than 5000rpm and 32mph

[@misters2837]

EASY...#1 You have an engine out of tune....OR #2 (and most likely)...the 15x17 that WAS on your boat was fixed or re-pitched, and the ding-dong that likely "Fixed" your old prop took some of the pitch out of it... My shop has DONE that to props in a pinch to get the engine in the powerband (Like if the prop is for something really OLD).... BUT he will grind the size off the prop so someone doesn't make the same mistake you did...

[@s10forlife350]

What if im trying to gain mph at 3k which is half throttle for my application

[@yosuecaridad944]

Give this man a beer

[@garygerard4290]

thank you - Thank You I'm saving this video for future reference

[@conradcanty9255]

My yamaha 2 stroke on my boat gets 5800 RPM wide open. Holeshot rpms I get 5,000 I’m told I have slip and should prop down from a 13-19 to a 13 1/4 - 16 help!

[@richardlewis482]

How much does diameter change rpm?

[@Roboticdoughbull3k]

What would be the best prop for my Little Mercury 7.5 thunderbolt late (60's- very early 70's). Currently has a I think 8" prop stamped A10L 7P. In my understanding that's a 10" 7pitch prop but no... It measures 8" roughly maybe a hair more. Anyway it's pretty slow and reaches Max revs within a few seconds and I know there's something better I can get regardless of this being on my flat bottom fishing boat, I still would like a little more speed? Thanks anyone.

[@TrumpsEarBandage]

Prop up to lower rpms and raise top speed. Prop down to raise rpms and lower top speed. Propping up weakens holeshot and vice versa

[@Dademold]

Great video question where can I go in Miami or upper keys to get my boat propped right don't want to buy three props to figure out thanks ?

[@mustangsupersnake7848]

This guy is good.

[@raffysanossian]

Hi I have 2008 stingray 185 ls volvo penta sx-a 3 liter 135 hp what is the best propeller ?

[@TrumpsEarBandage]

Install a tachometer, get rpm reading at WOT and adjust prop pitch from there

[@Indietro25]

Very good info .

[@jessevilla908]

Does anyone know what prop would be best for a 1999 Yamaha 130 horsepower?

[@andreasconstantinou4018]

Hello i have 60hp etec propeller 13.25x17 27knot 5100rpm i want more knots

[@dfort5203]

What he doesn’t mention is density altitude take a boat in Houston it’ll run 5500 RPMs take the same boat to a 6000 foot elevation like in Colorado it will only run 4500 rpms,know I had to change my prop.

[@TrumpsEarBandage]

Less oxygen at altitude, less power output from the engine

[@jeffm7669]

What about diameter?

[@TrumpsEarBandage]

Increasing diameter alone, without changing pitch will lower rpms, decreasing will raise rpms.

[@Trumpwonheckyea]

How the crap do you know what rpm you at with out some kinda gage

[@squelch6573]

My boats only making 4000 rpms i switched to lower pitch and then it made 5200 rpms but i lost top speed considerably !???? I dont get it ?

[@chrissteik6140]

What’s the best prop for a mercruiser 502 in a 28’ baja

[@TrumpsEarBandage]

Depends on your weight and weight distribution. Install a tachometer and see what rpm’s you’re running at WOT, adjust prop pitch from there

[@charleslove2319]

I got a Tracker Gide pro v17 1984 it has a Mariner 50 hp 2 stroke. I messed up the propeller all I want is to get it back in the fiver. The propeller said’s on the side it is 1311-111-113. Dos anyone know if I can put a different pitch other than 13? Because this prop number is hard to find. I found them in 10 pitch but not sure if it will fit my motor

[@cajunfamily5227]

Sure that is pitch? Sounds like diameter to me!

[@carsrme0141]

Could inget someone to contact me about what prop i should get for my omc 4.3l I/O speed boat?

[@TrumpsEarBandage]

Install a tachometer, get rpm reading at WOT and adjust prop from there.

[@etonsudarso5417]

Saya butuh propeller untuk mesin saya khusus Yamaha 40 pk saya berasal dari Indonesia

[@ullo-ragnartelliskivi4639]

how the fuck do i tell if i can size up my prop on a 9.8 hp 4 stroke seaking? i cant tell it by the ear, you know.

[@drifter9425]

EHH Bull just because the rpm is on the factory settings doesn't mean its not slipping ONLY way to know if your prop is right and efficient is to use the PROP CALCULATOR online Put in the current cruise and top speed Put in gear ratio and pitch of prop The Mercury Calculator will calculate slip % and ONLY then will you know if your propped correctly With this dudes method you could have to big a diameter prop and taking pitch out would get you to factory RPMs BUT your losing efficiency which is speed

[@shipmastershadowofintent5249]

Don't even own a boat rn just really bored...

[@jimquantic]

An even simpler approach: ask your engine's manufacturer their prop recommendation for your boat. "Hey, I have a Yamaha 115 hp four stroke, fishing boat. What size and type of prop do you recommend" End of story

[@kevinflabouyfishing5739]

Because each boat weight varies , how much the person loads , extra thing is the make and model vary with every piece of equipment added power poles trolling motor etc... full livewell full tanks of gas

[@StevenAller-dh7ug]

We are creating a 'kayak' site for marine/boating parts and accessories to help people find the best deal vs. having to go to lots of individual stores to research - we may also provide links to content on youtube such as yours so people can also get advice. What do you think about this idea? Do you think it is a good idea for yourself/your audience? We would like to get some feedback before we get too far down the road. If you do like it, is it the kind of site that you would feel comfortable advising your audience to check out? Thanks! Cheers, Steven

[@Holt0216]

Sorry but WOT isn’t where your engine is happy, this Yamaha rep wants you to repower after 400hours 😂

[@mengland67]

Anybody know how I can get in touch with Chris Holbrook above ⬆️⬆️ in the video? I have a prop question for him on my Yamaha F200XB.

[@reelnative01]

Ahhaha you did t say anything about the diameter of the pro it’s just as important as pitch, every inch of diameter is equal to 2in of pitch, if you have a 15-19 that’s dia and pitch and you boat is a pig and not running up to proper rpm and a slow speed you could change up to a 14- 21 prop and it would be the same s Rpm in Theory but you boat would run faster and have a higher rpm because a large dia prop has much more drag and a wider fan type blade, this guy eather nows nothing or doesn’t really want to get into prop theory

[@Str8Forward]

Sounds like he’s speaking a different language. Hahaha need to do more research

[@bikerator]

Tytuł po polsku treść po angielsku🥴😵‍💫Amatorszczyzna🤔