How many boat engines is too many?

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Peter Sripol
PMB328
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DISCLAIMER:
This video is purely for entertainment value, any and all replications of any experiments, projects, and creations or similar are the sole legal responsibility of the person(s) involved in replicating them. PSproject can not be liable for any information or misinformation, wrongful use, damage to personal property, death or any circumstances that result from replication of any projects seen.
Be safe and use your head people!

[@dfgaJK]

I'm amazed how well the low camera angles make it look like a full size boat!

[@caturlifelive]

Agreed lol 😅😂

[@MoneyPitBoating]

Was thinking the same thing!

[@dfgaJK]

@Karl with a K ?

[@brodz3000]

@Karl with a K shut up carl

[@kiarawhalen1544]

Agreed. The thumbnail got me until I started the video. But I'm drunk so it might not count.

[@infinitytoinfinitysquaredb7836]

This channel is like _Tool Time_ with an insane amount of imagination and energy.

[@Knemer1990]

More power!! (Tim allen grunt noise)

[@tomothybahamothy]

If peter uses the boat to smuggle cocaine it would be perfect

[@mattfleming86]

Ahh the Binford Bad Boy Boat.

[@OlaftheGreat]

AEUHHH???

[@1nvisible1]

*SOLUTION: You need a single toy boat mounted **_BEHIND_** the outboards but inline with original ship hull. With the three rows of motors only the first row is getting clean undisturbed water, everything behind it is just causing drag.*

[@FrijoleJoe_BeanMan]

Florida Boat man here, again. The Step hull Is Great for rough water, but ultimately slows you down. They're basically hooks. To achieve better performance you need Trim and Tilt, and Jack Plates. The trim and tilt will allow you to adjust the angle of thrust, making it easier to get on plane and reach a top speed. The jack plate will give you control over the depth of the engines, which also helps with acceleration and speed. Prop pitch Is super Important, but I'm not sure how that would translate into miniature applications, so you're sort of at a loss there. And finally, you made a very good observation not too many people would catch. The engines on the outside will get thrashed without something to help break the water. This is true for large applications as well. They're dragging more than providing thrust at that point. The ORIGINAL idea behind Multiple engines was to avoid getting stranded. If an engine failed, the remaining engines would provide enough power to pick the boat up and put it on plane. There's nothing worse than having to chug along at 5mph, 100 miles offshore, because you cant get on plane and cant risk burning all the fuel by plowing through the waves. Any number of engines past that is normally just a rich dude flaunting his cash and ego. And just for fun, I bet the hull you chose to model your "12 AM Quickee," after is either a Intrepid or a Contender (32'+ IRL)

[@EDCandLace]

Most definitely a contender

[@chrisk6101]

Just read Florida and he's qualified from the start and expert 🦅🇺🇸

[@josephgraham3807]

thank god were moving to pensylvania this summer been stuck here in florida for 7 years! (that was just bad luck i can speel)

[@reignman0311]

@@josephgraham3807 Pensylvania? Get a rope!

[@Lucien86]

I think he was also hitting the problem of not having enough weight in the nose.. The stack of three rows was definitely working though - so fast. All it needed was full all engine steer and that extra bit of weight..

[@makarlock]

I love how everyone at the actual boat show was like “yeah never enough outboards”

[@bigiron4018]

That was funny. needs more

[@feloniousfloyd2203]

They were being nice and having fun.

[@mjodr]

It's the reason the ridiculous photoshop's even exist. It's because that is the actual mentality of Americans building/buying these boats. I even tried my hand at a silly photoshop like this one time.

[@tin2001]

I feel like the correct answer is that once you need more then 2, you probably need to consider inboard engines. 4 or more and you're kinda just showing off that you're a wealthy idiot.

[@ConvincedIdiot]

I was waaaay to happy to just keep watching B-Roll of the 4 motor setup. I am so easily entertained......

[@AmmonHAMMR412]

With the addition of the smaller side boats, you created tons more drag. Also, the motors in rows wasn't effective because you wont go any faster without an increase in rpm, which would increase the drag from the slower motors. An impeller setup would be fun to watch!

[@davidbandler]

Also the reduction in propulsion due to neighboring propeller wake causing cavitation interruptions and blades being out of water. Watercraft are several separate systems designed to work together; hulls, propulsion, etc. You just can't tack a random drive system on a sail boat, barge, or anything random that floats and expect performance or worthiness.

[@Largetalons]

13:38 covered this...

[@godsonjoseph]

I am fairly confident peter knew exactly how this video would turn out to be even before doing all of this. Its just fun to go through the process even still :)

[@Lonemite]

@@godsonjosephI find physical models help a lot when I comes to seeing what other options might work. Kinda like the turbo axle. What an innovative technique that flopped hard. I’ve always wanted to see it revisited with more modern tech. Plus some odd things are just cool. The rotary Motor has its mighty big list of downfalls but it’s such a cool system to see done well.

[@letsdosomething6691]

You can get way more speed just by changing props. For the four motor set up the props are probably perfect for the power you have, but with the 12 motor setup you have tons of power you aren’t using. You can see this by the fact that the boat had an almost nonexistent 0 to top speed time. You need steeper pitched props to utilize all that power. For reference look at offshore race boat props. That’s probably the level of pitch you need. Where they are almost parallel to the direction of boat travel through the water. You could even do sequential pitch on each set of 4 motors. The ones closest to the boat being the shallowest pitch and the third set back being the steepest. You could definitely do a revisit video testing prop pitch.

[@Lizlodude]

Ok, I really want to see 1:30 done with a full size outboard now lol The baby outboards are so cute!

[@GrimReaping]

Hey Peter, if you want the boat to be able to turn in the stacked rows of 4, you'll need to invert the direction of the second set of motors. Having multiple pulling in the same direction will result in a "crab walk" or "strafe". / = crab walk / = turn / \

[@FtanmoOfEtheirys]

I would be surprised if he wasn't aware of this since this is also true for planes with twin props or more.

[@bigiron4018]

@@FtanmoOfEtheirys you misunderstand, he means the steering direction not the prop rotation direction. airplanes do not steer the prop.

[@GrimReaping]

@@bigiron4018 Thanks

[@GrimReaping]

@@FtanmoOfEtheirys Also, misunderstanding or not, knowing something and thinking to do something are two very different things.

[@bigiron4018]

Although I did just realize only the first set of motors turns, hence the issue.

[@newmonengineering]

I pretty much had an idea about the outcome from the start, you guys confirmed it. It's not just the number that matters. There are fluid dynamics at play. That said you just need bigger faster motors, not more of them. Besides more =more headaches and maintenance

[@roshanpereira7650]

Nowadays such real life boats are using toroidal props for propelling themselves they're quite efficient too

[@WowReallyWhoDoesThat]

I like the attention to the little details, like the rotating radar on top. The original row of motors might done better if there was adjustable trim. Also more might be more beneficial to run at top speed even if towing a skier.

[@williamdowling7718]

I love the attention to detail, especially on the "little johnson 25" stickers. I grew up with a small johnson 15 outboard that looks just like the ones you made.

[@sharonbraselton4302]

buy mini tug boat hibda 15 hp 21 moh 18 inch draft dowñ

[@kevinderung8524]

I agreed with the boat show guys "never enough motors" until you sent it...its be col to see some different prop configurations as well...and oh yeah you need to make it fly :)

[@power21100]

Hydrofoil it!

[@Sawer]

I like sailing, I think ONE engine is one too many xD

[@skitzojedi2505]

​@@power21100 hydrofoil...to float plane takeoff.

[@robwilcox9296]

You have a planing hull, with lifting strakes and all the weight is at the rear which does not permit the lifting strakes to 'lift' the boat. Add some weight to the front and it may fix the issue, and will also reduce your rear drag.

[@hockeymikey]

Good idea. I was thinking about weight too when it wasn't working well also.

[@whappy212]

Exactly this👌

[@colstace2560]

Trim the motors down a little maybe ?

[@davidbandler]

It is a ballast and center point issue, but I believe that specific hull will always plow-under and turn sub at an excessive speed point.

[@Debbiebabe69]

How about glueing one of those spare outboards to the back of the boat, pointing straight down, to help lift the boat out of the water? It looks like a lot of the energy created by those 12 outboards was wasted in pushing the bow of the boat upwards....

[@joshanderson1019]

I love this idea. From what I can tell, the motors on riggers was just too much, and putting them in rows behind might work if you make the propshafts longer on the motors the further back they are. Also the props are possibly too small since there is a bunch of bubbles from cavitation, but first try putting the props deeper in the water the further back they are and if you still see lots of aeration behind the boat when its not on plane, increase prop diameter and or pitch.

[@chchris51]

Looking forward to those stl files! Great video!

[@danielmarek4609]

More engines give you more torque but not necessarily more speed. More speed would come with different props or faster prop speed. Also putting more weight on the front to balance out the boat better might allow it to get up on plane easier.

[@nielsdebakker3283]

More outboards also means more drag. A pair of big outboards for a certain powerlevel is more efficient than more smaller ones.

[@tin2001]

​@@nielsdebakker3283 OK.... That confirms what I just commented elsewhere then... I felt like 2 is the sensible number, and if you need more, you probably want to consider inboard instead. I'd say 3 is the max you'd ever want outboard, and 4 or more is just showing you're a wealthy idiot.

[@davidleavitt5146]

Your prop pitch is basically your gear ratio... If you keep the same gear ratio and add more motors, it'll get to top speed quicker but will not go faster... Of you add more motors (more horsepower) you'll need to increase your prop pitch to give it a higher gear ratio which will give you more speed.

[@myotherusername9224]

Peter: drops 3D printed outboard in fishtank Fishes: "ahhh noooo... not again !"

[@markchinguz4401]

The fish looks sad enough in that tank already

[@WingedAtheris]

@@markchinguz4401 Yeah, straight up r/shittyaquariums material.

[@trolleymanV]

yeah, wtaf, animal abuse right there

[@theprofessionalfence-sitter]

I'd be curious, whether cutting some holes in the middle of the boat and fitting more motors through there might solve things. Presumably, the water will no longer be as turbulent once it reaches the motors at the back, so it might function better than the stacked rows. Also, you could fit the propellers in the middle somewhat lower than those at the back to get the boat to naturally pitch upward a bit.

[@shaiseg]

the prop pitch dictates the max speed. No mater how many motors you add, it will always reach the same max speed. You need to increase the pitch together with adding motors to gain more speed. Anyway, thanks for another hilarious project!

[@PabloEdvardo]

would love to see more along this idea, like dedicated turning props, and submarines!

[@PabloEdvardo]

you could also 3d print internal channels and make jets!

[@pinocleen]

@@PabloEdvardo Subs that can fly it is!

[@oliverscorsim]

I just wanna point out an interesting thing the motors on the right side of the boat when you lined them up on both sides were making the down wash much less frothy that's normally a good indication that efficiency is going up. I know in planes they had some success with tip motors making a vorticy that helps drag. Might want to try making them turn the other way on the left side and making new props.

[@DatBoiOrly]

9:40 Yeah the issue is thrust basically your creating a vacuum under the hull causing it to stick to the water and drag down the rear end theres a couple ways to fix this one of the simplest however is extending the length so it takes more force to leverage it down or weights at the front

[@nortvpn2550]

I grew up down the street from Shawnee Park, literally used to live on N Monroe it's so nostalgic to see it in your videos.

[@HeisenbergFam]

5:17 that 80s montage is sick, spectacular work yet again

[@vsci79]

The lil spinning radar is the cherry on top 🤌

[@user-cj5ly3ug9s]

You should have Tried Counter Weight

[@stewy4932]

Hi Peter I was wondering how you made the boat so it can be printed? I have one of those expensive motors and need a good boat to put it on.

[@JohnJones-ps9fo]

As noted by others here, there are a number of other factors that affect the performance that seem to be lacking proper consideration on this model boat: prop pitch and diameter, motor attitude (tilt/trim) and balance of the load--I can assure you that the boat will perform much better if those batteries are moved further forward, and that will decrease any need for additional lift at the stern (such as the empty plastic drink bottles or those smaller hulls), whether it's on a radio controlled model or the real thing--too much weight in the back and it's hard to get it to plane, the stern wants to drop down into the water, and your videos prove that--the extra width can also be a problem, but so can additional length--there is always going to be a point of diminishing returns, so YES, there can be such a thing as "too many" outboard motors--it was still a hoot to see all of the modifications and test runs, thanks for the laughs--

[@Arcfay]

My thought on this is that more same motor is like connecting the engine with more wheels to spin, like fwd vs AWD. I'd say there is a slight improvement in initial acceleration. At the end of the day, you are reaching the top flow speed of the rotors.

[@Lucien86]

Very close too if not reached.. I think you have the real answer here.. Need faster propellers.

[@PhilBender612]

Its like a Midnight Express, dude it is. I want that hull! Looks awesome. Oh, and I love the "Little" Johnson on the outboard cover. lol Great Job Peter!

[@milaandahiya]

I lost it when I read "12am quickie"

[@pious.techpriest]

bro, look at the Viet Nam era PTR (Patrol boat, river). It had a two stage impeller and was SO fast for its size. I think it was probably converging on the limit of the maximum velocity of a traditionally hulled boat. Could be very cool to try on the RC scale... Especially as a test to model up for your new large boat....

[@animationtime947]

I don't know how easy it would be but you should make an rc gatortail surface drive

[@ZanderPrints]

Hi Peter love your videos. You should make a dermal boat.

[@daniellewis1789]

SKINBARGE Oh, you meant Dremel!

[@mooney_gaming]

what if u use real boat engines

[@busasquid]

He’d be even more broke😂

[@mooney_gaming]

frfr

[@jram7047]

Im enjoying all the boat stuff your doing , hopefully your viewers and the algorithm works together to make it sustainable

[@mycorona66]

the problem you were having getting on plane wasn't the motor configuration as much as the motor "pitch". to get a boat on plane you have to trim the motors up so they try to thrust slightly downward which in turn lifts the nose of the boat and gets more of the hull out of the water so you go faster with less resistance.

[@danwood1121]

Would be cool to see your take on that dragster boat from Hydro Thunder

[@BIllMcCambridge]

I wanna see the skiff with the dog in the front!! From hydro thunder. Look it up it was a hidden feature boat!!

[@davidbandler]

For the amount of propulsion/engines you're wanting to use, the draft & water displacement is too shallow (or you need to switch to a more flat bottom, plane hull and/or a hydro-foil.) Increased surface area & buoyancy wasn't the solution, but increased ballast, changing the center point, and a longer, prouder keel. Your hull is the problem for the power you want to output - that hull will always turn submersible at excess speeds.

[@keybrent64]

Those stl files would be sweet! I really dig the hull design

[@PeterSripol]

Stls for the hull are up now!

[@pixelpeter3883]

Loving the on-board footage! The rotating shot got me puzzled for a moment (360camera?) until I thought of the radar! Cool! :-)

[@Jsederap]

Support from Philippines 💪☝️

[@Adriaaan]

You just create more torque if you don't change the propellers. That's why it doesn't go any faster. Also adding counter-rotating props could be ideal for the stacked setup.

[@bonafide9516]

I would have tried 6 tight on the transom. But you did so much work, well done and nice work.

[@ront8261]

Great stuff!! Props in the 2nd and 3rd row cavitate and provide no thrust once the boat gets going; they just suck air from the props in the first row.

[@PeacefulStream]

This is a great video.. keep it up

[@TrashPandaPirate]

I love how the consensus of the boat show was "never enough motors"😂

[@propabilityfpv]

That actually was a pretty sick 80's montage, and now that song is stuck in my head 😆

[@mioszbazyluk3285]

hello. Boat is amazing i am printing last part of it now and one question. What motor did you used?

[@sethburnsman]

Can you 3D print toroidal propellors and do some efficiency tests? Would be cool!

[@BIllMcCambridge]

Funny how toroidal propellers are "new technology" they were invented in the 1890s hahaha reinvented in the 1960s. I do understand that material technology and manufacturing processes have made them easier to produce it's just funny when the marketing department gets involved it is labeled as new tech.

[@guily6669]

@@BIllMcCambridge Probably, but even then I have seen some good amount of 3D printed versions and they were worse than the original propeller, every small tweak could do a big difference and probably will still have to do many tries to get a perfect one.

[@jons6125]

Well obviously 6 was the magic number as recommended by experts at the show

[@WuTangcl]

@Petersripol Can you please tell me where you have gotten those gears for inside the outboards?

[@danielpacheco771]

Do you have the STL Files for the center console and hard top?

[@Lancerandduck7]

I find it hilarious how evenly-split the vote was on "too many" or "not enough"

[@BrutalButtSlap]

Because there is the cautious-entusiast rich folk that have in mind weigh and efficiency in mind and the crazy-estusiast rich ones with now 4 is enough but if you got the gas why not

[@femanvate]

And TV wonders why their ratings are down. Channels like this are the new entertainment! Cheers!

[@leokimvideo]

Your always going to be up against the 'hull speed' of a boat, adding more motors just adds more drag once you go past the happy balance of power for the hull design

[@KrayZieTyler]

you're

[@h2s142]

@@KrayZieTylerur a B===D

[@KrayZieTyler]

@@h2s142 hey man, I'm just doing my job to help fight the "your you're there their they're our are" pandemic.

[@MarkTubeG]

That's what I was taught by a sailor. He was training me on a sailing yacht. He said, while under motor power, don't push the RPMs past the point of diminishing returns. The hull speed maxes out, and more power just uses more fuel without much, if any more speed. This guy's hull seemed maxed out, and more motors just made more bubbles, not speed. He's gotta deal with drag as he adds more power.

[@EdwardChew]

Those funny configuration after the failed one was hilarous

[@Stealthfoams]

what brand outboards r those

[@wesbrackmanthercenthusiast4695]

You need to do more train stuff

[@SaureZitrone]

Love youre vids keep it up🎉🎉

[@reub-topia2656]

Is the boat you took out to the filming location the one you've been fixing up? looks really nice! Will we get a video about finishing it up?

[@jackm6307]

Trim the first configuration either in total, but at least the left and right 4 motors. Fun video.

[@SOLA_FPV]

Going to need them stl files I’m going to need something to do this weekend. Bad ass build buddy

[@PeterSripol]

they're up for the boat now! motors are still in the works

[@witebwoy13]

@@PeterSripol any chance you have the stl files for the console and hard top?? I have been searching the internet with no luck. Just want to print a cool display model.

[@resistanceisfutile]

I think my favorite thing about this and many of Peter's videos is the chemistry between him and his brother.

[@ayoaina_fpv]

1:30 Wow! That was close! Any closer and you'd have had minced goldfish lol 🤣

[@SnowingNapalm]

so glad you tried all the configurations and went 12x maybe a prop swap for the successive layers of motors like each row gets more agressive pitch props basically each row being a stage ... uh oh you forgot to do single file 12x outboards can't wait to see 🙈 the results ❤

[@MACH050]

We need more motors

[@wessle3233]

great to know i'm not the only one who thinks they put way to many on there

[@ZirconGames]

I mean.. in my opinion once you go over.. 3 it's already stupid, but if they have the money... idk

[@Zappy1210]

Pitching the motors will give you more speed, plus counter rotating motors might be helpful too.

[@user-vt2ps3kl2o]

Looking forward to your stl file. I'm waiting here

[@Maybe-So]

Government: oh no! We must regulate that!!

[@altraffie20]

Damn!😂

[@kjho1224]

I think I need to make some outboards, I need the files as soon as possible

[@42jeep]

Awesome video mate i want to print this boat and can't wait for the file.

[@thercadventurechannel4782]

Great video! Can’t wait to see the STL file for the outboard motor. Do you think one of those outboards will be enough for an 18” boat with a 1lb ready to run weight?

[@tin2001]

Hull shape and prop pitch will make a massive difference to whether to works or not. Also you're desired speed will be a factor in whether you're disappointed or not.

[@Heneling]

my brother tried to set fire to my house while watching this 🤷‍♂

[@nickye2864]

I'd say 750000 is too many and 0 is too little. So somewhere in between.

[@lonestranger]

@3:58 I thought you were cleverly making it look like 0:18 of the GTA VI trailer, until I saw this was uploaded 6 months earlier than GTA's.

[@ngsomeguy]

If i may, try a hydrofoil setup on it with different stages for the motors. 1st is the original 4. 2nd is the additional 8 once the lift is achieved.

[@justinsch789]

Ok!!!!! Really need a shopping list for this project!!!! already have the motor parts printing!

[@TransAm2k4]

Some of these configuration I wonder how much you were limited by prop pitch and hitting pitch speed with the boat (speed where your prop has no slippage and theoretical max speed of a certain pitch/rpm combo)

[@cadruo]

What electrics did he use for the outboards? Link

[@SailingFrolic]

When you lined them up behind each other, I legit had a flashback to how I used to draw boats as a kid. Literally exactly like that, lol

[@Precisionreelworks]

This is really cool. do your port/starboard motors have gear cases that rotate opposite directions?

[@piepo255]

witch hull u using?

[@leeawesome4386]

you could also put the motors behind the boat but in a stair arrangement so that the turbulence from the motors closest to the boat doesn’t affect the other motors

[@zachlynn276]

Man that’s awesome I’m waiting on the stls for that outboard

[@rcOhio]

been a P.S. fan from the beginning! This guy is so awesome! So smart! Keep it up Peter!

[@busasquid]

I like how Peter talked trash on the Miami water when his fish tank was absolutely foul smh

[@robjones5]

I'd love to have the plans for that hull. That thing is sweet looking

[@stanleydsouza6723]

Peter Sripol is Aeromodelling enthusiasts best 👌 buddy..We as enthusiasts love all your experiments, Hope more from you, Love you 😍

[@MarkTubeG]

Very fun to watch your fun! Entertaining video, well shot and narrated.

[@justinsnyders5347]

adding adjustable trim would have helped with a 140 on my 16' id have to be trimed all the way down to get on plain then trim up or the rear would dive like that

[@kornfed81]

I know it could just be appearance but all the motors within the width but behind the boat was faster. Its awesome!

[@randomstuffbychris]

The four motor montage was pretty sweet

[@BikingVikingHH]

A propeller in water pushes water backwards, propelling the boat forward. The terminal velocity of the boat is the velocity of that backwards stream of water minus the drag of the boat. The more propellers in the water, the less effect the hulk drag has on decreasing that terminal velocity, but at some point you can only go as fast as the propeller spins and sends the water backwards. Basically the more motors you have the better at towing you will be at low speeds, but it won’t ever make you faster than the terminal velocity of a single engine propulsion stream … It’s like a car with tires that slip on the road surface. Making the tires wider will get you better grip, but won’t make you go faster..

[@mr.hermitsquid2694]

What software did you use to make the boat and outboard shapes? Trying to figure out how to design a 3d printed plane and don't know what to use yet.

[@Boonesfarming]

How about a beach dory style engine well in the middle of the boat? Love the video and channel!❤❤

[@emory442]

I love the silliness of this project, but man, that boat looks really nice.

[@MrXhandsome]

Hello, I really like this project. I am looking forward to the boat's stl files to upgrade the design even better.

[@SocksWithSandals]

That was extremely interesting. I was surprised that was even a relatable problem!

[@jam3112]

You need to layer the motors like theater seating. With th le lowest layer closest to the transom. Also I would suggest differential thrust.

[@fossilfool]

Good vid. Have been considering adding a 2nd motor on my dinghy.