Homemade Jet Unit 3d Printed, 2 Stroke Jetboard!

[@TheSmallEngineShed]

Thank you for posting the 3D printing files for the engine coupling. I'm going to build one of these some day maybe 3 or 4 engines together.

[@DktheWelder]

All good , be so cool to have 3 or 4 running together I was thinking of leaving room in the board stack another motor for more power later!

[@TheSmallEngineShed]

@@DktheWelder yes that would be cool. BTW I'm the some person as TURBO EVERYTHING did you get the link for the easy start.

[@theideasman6018]

Awesome. It's good to see people making things for themselves. I can't wait to see how the board goes in the water. Nice work MAN

[@DktheWelder]

I know I thought I was going to get it in the water this video but some many things to do!

[@theideasman6018]

@@DktheWelder I have an idea for the pull start. Put it in the bin, lol. Use a cheap cordless drill, then you can have electric start going to the hand throttle with a kill switch

[@DktheWelder]

@@theideasman6018 that is a pretty good idea!

[@theideasman6018]

@@DktheWelder for you're air intake hand pice thing. You could 3d print somthing like a hand gun. Easy to hold an maybe design it so when you let the hand pice go the intake is blocked off

[@alasdair4161]

Great work as usual Daniel. One thing I'd suggest is to put a small centrifugal fan under the panel where the air inlet tube connects. You could run it from a lipo battery or similar, basically just to help offset the suction drag through the tube which will probably cause over rich mixture if the airflow demand exceeds atmospheric delivery. centrifugal fans are readily available and will deliver more flow pressure than regular axial fans of similar size. Cheers, and good luck.

[@DktheWelder]

I’m wondering when running at full throttle if the pipe will keep up , I don’t really want to have to put more electric stuff in there but I might have to thanks👍

[@waynetrask3523]

Thanks mate for showing your project I’m lovin it Just one thing I’d be thinking about and that is putting the kill switch on the hand piece and make it cut the engine if you’re hand lets go Might limit water intake through air inlet when you fall off

[@DktheWelder]

Yeah it is probably a better idea!

[@PatonMachines]

Hey Daniel! Good to see the update on the build! These are good cheap chinesium engines aye.

[@PatonMachines]

I was thinking to stop water getting down the intake when you fall off, could have a valve on the handpiece that closes when you let go of it?

[@ats-3693]

Haha I love the way you don't edit out the balls ups, you're the realist KZbin fabricator there is and that is just one of the things that makes this a great channel 👍

[@UbuntuBirdyMovies]

Man! I've never seen one of your videos before. But after the first 4 minutes I believe you are my soul mate! This is exactly how my projects turn out! Every time! Now I feel way better in my life... 😂

[@DktheWelder]

Thanks I just fumble my way through!

[@danclement8858]

Getting super excited to see this thing on the water! Great video as usual!

[@apexaero]

I think the tank breather within the intake snorkel will make a vacuum problem for the fuel tank making it difficult to pump fuel to the engines. The serrated flex pipe has lots of flow restriction causing additional vacuum. Also: you might want to think of a valve on the intake snorkel. Perhaps a valve connected to the throttle so it opens as needed, for when you fall off............otherwise glug glug glug up the snout.

[@matui6983]

Best part is its 100% Kiwi. So close to test day, cant wait.

[@AtimatikArmy]

Why are New Zealanders Kiwis? Just curious!

[@MsJon52]

very inventive, good to see how you overcome the obstacle's with fabrication, nice one.

[@andersson.l.e]

Nice video as always. Looking forward to the next one as usual. Keep up the good work.

[@pazakkattack]

Sick project and an excellent video. Can't wait to see it finished. Also nice chooks.

[@hamishhill]

yet another great video thanks dan, can't wait to see it on the water.

[@dallas749]

Another good vid, i can see the shape of the board a lot better in this vid its looking really good.

[@DktheWelder]

Thanks I like the shape it is wide which will make it easier to ride but won’t be super fast

[@darrellcook8253]

I was so impressed I subscribed. I really want to see it in the water but realize its a work of art in progress. My advice? Manufacture them using more metal parts and mak a bundle of money and joy! Hope its stable in the water and tracks well. Best of luck and looking forward to seeing more. Thank you.

[@djmjr77]

This is an awesome project!! You should ask Bruce to cast you some of the 3d printed parts for you.. I could be wrong but indont feel like the PLA parts are gonna last to long especially the motor coupler. Cant wait to see you riding it!!

[@DktheWelder]

I just sent him another impeller file for the surfboard hopefully he prints it off and casts it soon 👍

[@AtimatikArmy]

Hey, you might want to tie a rope or cable from your throttle handle to the board because when/if you fall off and hold onto the handle it's going to pull your throttle wide open. Luvin this content man!

[@DktheWelder]

Yeah if I yank on it too hard it will go full throttle! I will have to do something about it

[@hackofalltrades5256]

Had some experience with linking pocket bike engines together to reduce vib and coupler damage timing 180degres apart may help with pluses;)

[@DktheWelder]

Thanks I do run them 180 apart , they vibrate way less now with the board all more secure 👍

[@Kiwi-pp7rg]

You and Clarke Gayford make great mates with all that snow

[@DktheWelder]

Except he has the most horrible wife in the world!haha

[@Kiwi-pp7rg]

@@DktheWelder Funny like it well said!!

[@curlycallmcdiesel5074]

Love the Soundtrack! and the content is pretty cool too.

[@Hellsong89]

You might want to add gravity controlled valve on the intake handle so if you flip over, drop the handle etc valve closes and no water gets into intake and cylinders. Not sure how this valve is constructed but so it closes when no in 45?degrees from upright. Could do it with servo and gyro sensor maybe?

[@DktheWelder]

I been thinking about that unless the board is completely under water the water won’t be able to flow up the intake hose , even when the board is upside down it has to fight against the air pocket. What do you think?

[@Rudytools]

Having the fuel tank breather in the intake for inside the board, could that cause a build up of gas fumes inside the board? Unless you meant the breather is on the outside of the intake tube then nvm. Very excited for this build!

[@DktheWelder]

Maybe I could run it out to the air might be safer👍

[@darrellcook8253]

Might consider a small centrifugal fan to blow out any built up gas fumes or I know where this project is going,,BOOM! That's why inboards have blower fans. They keep you from going BOOM! Fumes are bad.

[@Vegas5302]

I love the videos man I’m glad I keep catching them so early

[@MonsiorTortoise]

I have just designed a wind powered boat plane design. I have started building it. I have also planned a thruster system, thiis thing will out perform fighter planes.

[@christaylor9342]

With your engine snorkel have you thought about attaching it to a fishing rod blank to keep it up without having to hold it.!!!

[@DktheWelder]

I like that idea ! A really flexible one that holds it up a little good thinking thanks 👍

[@x-tayfoun]

I want like that water pump a little bigger size for motor jetski ??

[@DktheWelder]

I think a proper JetSki pump is way better

[@CarbsAndTurbos]

You can buy an easy pull start for them engines you'll need to change the flywheel but its so worth it

[@DktheWelder]

Easy pull start? I want that can you send me a link please

[@alvaropablo4688]

That's really good stuff man.

[@skysurferuk]

Thoriated electrodes contain... thorium... when grinding, maybe take care of that... Great build!

[@pauloconnor7951]

love your sense of humour !!

[@ahmedalmurshidi2638]

You could have used Teflon, the white kitchen cutting board, that is friction-free, so you may make your pollies from that material.

[@cgscercar]

Hola que motor y marca es ese , doble cilindro

[@hackofalltrades5256]

Keep up the awesome work thank you for your continued commitment .

[@DktheWelder]

Thanks, this fiddley build hopefully it works out in the end

[@RobPollen]

What you needed was a tandem rear brake cable - Shimano make stainless steel ones

[@Ben-Dixey]

Your videos are really good, keep up the great work. I haven't got into the 3D printing world as I tend to go straight to metal but I can see for prototyping it could be very useful and save time. 👍

[@DktheWelder]

It is useful for prototyping but can also be strong enough for some good parts, I have made plastic dimple dies the work in the press!

[@westmonroe-r1v]

That front engine will run way hotter with the way you have it plumbed maybe put it into a y joint before the engine.

[@DktheWelder]

Yeah that is good thinking balance the heat evenly

[@Dave5843-d9m]

Wood expands when wet so it bends (warps) AWAY from the wet side.

[@dallas749]

Hey dan, do you reckon this would have done better with a 212cc predator 7.5hp running the jet unit or worse?

[@DktheWelder]

I think it would have done better, not as fast as the longtail but it probably would have got planning just

[@oscarzt1652]

excellent stuff dk

[@alex4alexn]

new subscriber here, super pumped to see this bad boy

[@philipm7054]

Is a motor bike with a rear track the next project?

[@DktheWelder]

Haha that’s just an idea I have been thinking about for a while!

[@lewisw2693]

Thats sweet bro! I wanted to do an electric one with foam or a composite!

[@DktheWelder]

I think that would be way easier to build than my one! Probably work better too

[@curtism7203]

It would be really beneficial for you to ditch pla and go with something like PETG or ASA as they are much stronger.

[@JetSurfingNation]

Great project 👍

[@buildingracingvideos4714]

That snorkel being so long is most likely going to be a restriction. For the length it seems kinda small. The longer it is the bigger it needs to be.

[@TRVABL]

Awsome work...where in nz are you from ?

[@DktheWelder]

Waihi

[@Vegas5302]

It amazes me how vastly different the other channels I watch are When it comes to 3-D printing

[@DktheWelder]

What do you mean? How are they different? I guess I explain less than they do?

[@Vegas5302]

@@DktheWelder like you are the only channel I watch on KZbin that doesn’t make like small robotics projects or basicly toys out of the 3d printing you show a whole Nother side of the possibilities and I love it❤️🤙🏽

[@DktheWelder]

@@Vegas5302 thanks, yes it seems everyone just makes toys and props. They are useful for so much more

[@lancegouvan1653]

This kind of stuff is awesome

[@WikWak]

Wow. Edit: jesus christ, you made your own impeller!? How are you gonna stop the thing filling with water?

[@DktheWelder]

There is a cover for over the motors the next video is just about to upload

[@WikWak]

@@DktheWelder so youre gonna seal it up 100 percent water tight. Good luck my man. Amazing project.

[@DktheWelder]

@@WikWak yeah pretty much , I had to make the motors water cooled which was difficult

[@WikWak]

I intend to go back and watch from the start, the last episode popped up in my feed.

[@aloooox]

you don’t need 2 kill switches, all they do is ground the magneto so no spark is produced, linking the wire and having one switch is enough.

[@DktheWelder]

I was worried that it would cause the other motor to fire at the wrong time ? Anyways I have the 2 switches to use👍

[@parker1ray]

What the F is a blocked carbie?

[@limitlessbuilds]

Love it! I would do what others have said, make one motor stroke on 180/opposite the other. Would be a smoother pull start and more even power too. Love how much practical use your getting from the 3D printer! Also, I’m pretty sure the kill switches can be linked together. Save some wiring and effort. Keep it going man, killin it these days

[@DktheWelder]

Thanks! They are 180 apart, that wire just shorts the coil I was thinking that the would spark the opposite plug if wired together

[@WoLpH]

Generally increasing the wall thickness makes the part stronger than 100% infill. So instead of using 100% infill just increase the wall thickness until you effectively reach 100% :)

[@DktheWelder]

I have been told that but a problem I have the more wall thickness seems to distort the part more and also makes it peel off the bed , I am pretty new to 3d printing any advice on how to solve this?

[@WoLpH]

@@DktheWelder Your nozzle size is by far the most important factor when it comes to the width of a single line of filament. So if you have a 0.4mm nozzle you should try and use a wall thickness that's a multiple of that to work. Trying to print a wall that's 0.6mm wide with a 0.4mm nozzle will probably result in 0.4mm instead. With a 1mm wall and a 0.4mm nozzle you can make it work through infill but it won't be too smooth that way.

[@WoLpH]

​@@DktheWelder With regards to peeling off the bed, it can help quite a bit to have something to enclose the printer. Usually the peeling is caused by uneven cooling and/or too rapid cooling. As a simple test, just put a big cardboard box or large bag around your printer :) I don't recommend cardboard long-term due to the fire hazard though. But special insulating enclosures are for sale, or just muck something together. I've got one of those IKEA Lack tables with some polycarbonate sides as an enclosure and that helps quite a bit.

[@lukealsmith]

I only scanned through your video but the aluminium casting you'll probably need to balance.

[@jamesswampy]

For you inner cable have a look at a Volkswagen bus universal throttle cable for something like a 1970 type 2 bus they are about 6m long to go from the front of the van all the way to the back

[@DktheWelder]

Thanks, that would work but I need to push forward with my projects waiting for parts to show up takes so long these days! Hopefully what I have made will hold up

[@bigdaddy_TV]

Awesome dude 👏

[@tazyt3388]

seriously bro luv it your a clever bugger goodonya mate cheers

[@iamkian]

Next video... Testing it on a lake !!!???!!

[@DktheWelder]

I was hoping to test it this video but so many little things to do! I’m hoping to test it next video

[@Vegas5302]

Hell yeah I’m here again

[@306champion]

A jit powered surfboard.

[@BruceLyeg]

I could swear I already commented here

[@РоманТар-ф9э]

Привет. Тоже строю серф с мотором. Водомет на 3д принтере

[@DktheWelder]

O cool I will check out your chambers

[@tylerseabook9423]

This is bad ass

[@lewisw2693]

Fat rail you did there!

[@Vegas5302]

“ after you get cut”😳😂

[@DktheWelder]

I do that every time!

[@Vegas5302]

@@DktheWelder I promise you’re not alone 🤝 same here brother

[@MultiObeone]

Awesome !!!

[@toneault7499]

HI DO NOT TAKE WATER OUT AT FROUNT. .take out asap side or weight of water will fight you .. im a large boat builder but it all looks good from down here lololl keep it up.. ?? lolol

[@DktheWelder]

Like it won’t have the pressure to push the water to the front?

[@petermines3575]

Awesome.

[@tucanman9775]

TWO WORDS STARTING FLUID DONT START A TWO STROKE WITHOUT IT

[@terjee648]

2:28

[@tijssens]

snorting styro is bad mmmkay

[@captnjaygreybeard6394]

👍✌

[@orppranator5230]

9:46 Made me cringe. At least don't hold it like that if you aren't gunna put it in a vice.

[@DktheWelder]

I knew there would be someone haha!

[@noeaguinaga4018]

Bruh we must be brothers from different mothers.... You do shit the same way I do lol . Half ass with no protocol for safety... No pain no gain. If you don't do it and make mistakes how else are you too learn.. definitely not from these diyers on here.... You never see them hurt ... Or Thier mistakes ... They expect these poor SOBs to believe that what they do is perfect...

[@DktheWelder]

I know have to put all my mistakes in building stuff with limited time and money there are going to be mistakes 👍

[@sergiososa5855]

?????????2023

[@DktheWelder]

What do you mean?

[@staydown.normal5323]

those 49cc motors are shit. you should have used the other style 49cc motors or even the 79 cc auger motors

[@DktheWelder]

Someone else said those motors are no good , hopefully they work the 79cc ones I haven’t seen them?

[@staydown.normal5323]

@@DktheWelder the 49cc i have on both my gas scooters with a walbro carb and a good tune you can do 34mph

[@staydown.normal5323]

@@DktheWelder kzbin.info/www/bejne/ZqrXanZtmLqNkMU

[@adrianbilas6901]

@@staydown.normal5323 Hi, I know this comment was from a year ago but I was just curious as to what the name of the 49cc motor that you used is called. I was planning on making this kind of project as well. Thanks

[@staydown.normal5323]

@@adrianbilas6901 i can make you one my first job was working at a little hobby shop that sold race gopeds so i know how to tune them fast! and what it take to get the to go faster

[@jelcyneze]

You can't use 3d printed elements in drivetrain. All those nozzles, couples, propellers will broke before your boat move 5 meters. Propeller must be metal made.

[@_jonathas.castro_]

haha 👃

[@Tumyp222]

3d printing is not your business

[@DktheWelder]

I think this project was the first time I used one👍

[@Tumyp222]

@@DktheWelder I use pet-g, It better for my mind

[@Tumyp222]

@@DktheWelder I also have ender 3

[@Tumyp222]

kzbin.info/www/bejne/nJuWkoODj719qKc 12 hp engine, old outboard

[@DktheWelder]

@@Tumyp222 there are a great printer especially for a beginner

[@David-uy6ch]

Awesome