Відео

The bag goes inside the cone with enough extra material to suck into the cavity. The vacuum evacuates the air from the bag, and between the cracks of the mold, and the bag squeezes the mold and layup assembly. The trick was to get enough slack inside the cavity so when the air is sucked out the back is sucked down towards the tip. The atmosphere is still pushing on the bag outer surface, the contour of the mold is just a bit weird. I think I've seen what you mention with a tube, but that is for through-holes maybe.

Hey! Do you mean print/design more parts? For now, I feel things are fairly complete and I’m happy with what’s there. I always welcome remixing if you have any great ideas or additions :)

@@adambjohnson yes, I was thinking about complete the external parts of the fan, I'm still printing all the parts to build It, is a wonderful project jajaj

@@davidtebarzamora9775 ah I see! The new parts are from a more complete model that does have a lot of extra bits and makes the outside more of a realistic model, however, there were significant modifications I was going to need to make to accommodate the extra pieces and parts around the base, so I decided to only use a number of pieces for the front to help with inlet ducting. I decided I’d leave the back open for now, but I’m open to suggestions for the future :)

Hey! I’d say you’d want to consider the number of layers and orientations for your needs, but the main idea I would say should extend to a carbon fibre cone

Hi! I don't quite understand what you mean? All the STLs should be on the thingiverse post, and the PCB files and schematic are all on GitHub. What are you looking for specifically?

Hey! I am a few days away from verifying the new pcb and posting the gerber files on github!!! I will also post a video on putting it all together asap as well. Hold tight a couple days!

@@adambjohnson Could I please get an update on gerber files?

@@user-yy8ho5qk2v Hey! I did receive the new ones and they worked great but I have one final adjustment I needed to make. I ordered new ones Wednesday and they should be here in a few days. I just want to validate JLCPCB can do what I asked for the update and I will post the Gerber immediately.

PCB Gerber files up on GitHub!!!! Have at'r! github.com/nairck/TurbofanDriver

Good question! I’m making another video soon would should demonstrate some air flow with hanging strings. I don’t have any numbers or forces to give you though. It’s not producing enough thrust to rip it off the tables I guess 🙃

@@adambjohnson great i wonder how much it can lift if it tried to use for flying

⁠it’s unfortunately more of a demonstrator rather than a useful engine. The compression spools and stuff internally really do nothing other than spin - they would ideally be squirting fuel and igniting it inside to generate thrust. Further, 1/4 of the housing is missing, so any developed flow is just thrown out. I have printed front covers to guide the air in better and some ducting after to focus the air, but the thrust to weight ratio is still pitifully low to do anything real with. I also wonder if some idealized version of a 3D printed compressor would be useful 🤔

Good question. I don’t have a great answer other than this was a proof of concept for the process and the directions of each layer may have just been chosen for example. I’m not sure what the team uses now, but I’m sure they have put more thought into it. This method should let you use any kind of layup you wish

All of your questions can be answered in the description, which includes links to the very detailed files and instructions to make one yourself. This is a model turbofan

@@adambjohnson I ll check it out man sorry for not looking in the description i thought u only had the jet files there, not the spinning thing too

in the description

It can be a tough model to get together if the prints are too big. What printer are you using? Everything printed nicely and fit together well on my Prusa MK3S There is alignment issues I need to revisit someday

Check the description

Hey there - yes this is also a problem for me. The shaft line needs a redesign and i haven't had the time to do this. I think having a bolt connect the shafts would be smarter than what I did. Open to any help :)

@@adambjohnson Yes sir, i 3D printed both shafts with a 10x1.5 mm inside right hand thread and used a 40mm (10 x 1.5 mm ) set screw to connect the two shafts. I am close to where i need to be but not quite there yet. I was also thinking of doing the same and have the two shafts machined out of aluminum.... LOL, maybe we can figure this out in time!!!

@@garylefebvre5407 Set screws push on the shaft and might be causing more misalignment than alignment - I was thinking a tapered end or something for each shaft with the axial fasteners could help keep things aligned. A solid shaft was always too long for a conventional printer. Main problem is the stackup of tolerances, not the materials, so you'll just put the problem somewhere else if you do all aluminum :)

@@adambjohnson Ok, I will look into axial fasteners!!!

@@garylefebvre5407 axial in the sense that the fastener gets inserted and threaded along the same axis that the shaft rotates on. I used to have an M5 joining the two shafts in the middle, but I think I need an aligning/mating feature like a cone that forces the shafts to only align in one way. I think the aft shaft also needs a locating feature printed into the final blade stage to ensure alignment between those bodies. Since the herringbone gear set are on that stage, that should fix the majority of the alignment issues. I think I should do a revision of the shaftline at some point...

Not sure exactly how much it all cost to print, manufacture, and assemble, but there is a very detailed assembly procedure in the description to see for yourself 😊

All of the details are in the description with links to Thingiverse and Github

Thanks! All the details how to make it with instructions, videos, and parts list are found on the main Thingiverse page: www.thingiverse.com/thing:4743929

@@adambjohnson thank you!

Yes, obviously this isn’t a real turbofan jet engine…….. just a fun model to print and highly generalized configuration… for fun and learning 😊

@@adambjohnson , A good model, no doubt, but no learning at all.

It’s also not my design, I just designed all the electronics to make it to “burrrr”. Feel free to complain about the design to the original designer!

@@Ljet600before you state your opinion you should behave decently and take the time to research what you’re complaining about so loudly. In this design the HP-Shaft is supported via bearings on the LP-shaft that reaches through it and is supported by bearings in the engine housing in front of the first compressor stage and after the last turbine stage. Since bearings also have a resistance and this is a small light plastic model, the HP-Shaft will basically just spin with the LP-Shaft. You can also spin the two shafts independent. That is realistic and how it’s configured in the real deal. You don’t have any point being so whiney about it.

A little decorum goes a long way. @@Ljet600

Yes, seems to be getting more popular over the years and folks remix and repost their own versions :) As for accuracy.. it was designed by another community member many years ago, and I've just made the modifications and design for the electronics to make it spin fast! Would be cool to have a bit of a more accurate model, but I think it's great for 'show and tell' with most of the main turbofan bits. Happy to discuss incorporating easy adjustments to the drive line or things that could be more realistic.

@@adambjohnson Yes, I agree, in it's current form it's good enough for show and tell as you mention and makes a great desk model! I believe this design is supposed to model the Rolls Royce Trent 900 which is pretty complex. In the real engine there are a total of 14 compressor stages and 7 turbine stages. It is a "3 spool" design in where one spool is the Fan driven by 5 turbines, an "intermediate stage" compressor (8 stages) driven by one turbine, and a "high stage" compressor (6 stages) driven by one turbine. Most of the power is produced by the fan hence it needing 5 turbine stages to spin it. I've been working on aircraft for over 30 years and I still love it LOL.

⁠wow that’s awesome! The more detail the better :) I’d love to retrofit a bigger/more complex model in the future! Happy to hear people loving their work, I do to 😊

This model is NOT modeled after the Trent 900. The Chinese websites have essentially stolen this model and don’t understand its origins. I designed a nacelle to fit this model. (They stole that design too.) The nacelle was modeled after the Trent 900 because there were so many images of it available on the web. But the core engine itself never had anything to do with the Trent 900. This model is based upon high bypass jet engines in general. It has features common to all jets and was designed to represent a typical high bypass engine and be easy to 3D print. Again, it wasn’t modeled after any engine in particular. It certainly doesn’t resemble the Trent 900.

@@rtwileyrc8030 Leave it to these Chinese websites to claim something that isn't true. Go figure.

The link you provided is for the exact same design where the compressor blades at the fore section of the engine are not on the same shaft, but on bearings that allow both sections to rotate freely. I’ve only designed in the electronics to support a motor, screen, and the ability to adjust speed. Adding a different speed stage would require a lot more thought and/or another motor. Furthermore, I think there may be a couple different designs for a turbofan. My understanding is that they rotate in the same direction at a faster rate. I have only taken a few classes that discuss turbojets and turbofan but am certainly no expert. Wikipedia has a nice gif illustration en.m.wikipedia.org/wiki/Turbofan but i also found a GIF of a counter-rotating compressor blade on a different design here (not a bypass engine though) www.hpcwire.com/2020/07/14/joliot-curie-supercomputer-used-to-build-first-full-high-fidelity-aircraft-engine-simulation/#foobox-1/0/aircraft-engine-gif.gif looks like there could be a number of ways to do it. Learn something every day!

Check out my assembly videos to see how it goes together - you can see how the compressor blades are on their own shaft with bearings on the main shaft

It is completely 3D printed with some electronics inside. It would be a lot of fun to do a PCB but not necessarily needed at this point :)

@@adambjohnson Absolutely EPIC! Anytime you'd like to do an upgrade version or for any other projects, keep us updated, would love to do something amazing together! (My contact info is available under this account, talk soon)

Personal project I came up with for fun :)

Gotta get the brushless installed instead for those kind of speeds :D

I use an RS 5555H 12V Brushed DC motor. Check out the Github and thingiverse for links and more details github.com/nairck/TurbofanDriver

All the info with links to purchase every component is on the assembly procedure located on GitHub! More details are on the Thingiverse post!

Did you look through the electrical assembly document that show the bottom and top views on GitHub? The potentiometer can be soldered backwards but the resistance will change. Between the documents and videos, is there still ambiguity?

Hey there, that’s great that you’re diving into it! Here is a video from adafruit on soldering and using headers. Hopefully it answers some questions! ua-cam.com/video/Z0joOKaQ43A/v-deo.html

Please find all the info and parts needed in the description on Thingiverse! Instructions and links to the purchased parts are within the electronics instructions

​@@adambjohnsonhow much PSI please, I couldn't find it on things site

I'm trying to work out a more meaningful measurement of thrust, along with a bypass shroud to show the difference it can make. I was hoping to use a smoke analog but need the space and materials for that. I also wanted to use a scale and/or rolling cart to show some numbers. I'm open for ideas!

Thanks! The mold was printed solid so that I could anneal it and minimize any warping or shrinkage to preserve the shape during the annealing process.

First off, it is a rocket nose cone, not a warhead. There is no militarization or related purpose for this video, other than model rocketry, specifically for university teams. Secondly, a solid 3D printed “nose cone” would be extremely heavy, and the heat generated by supersonic flow and/or sitting on a launch pad would soften the plastic.

The strength to weight ratio in comparison when laying up fiberglass with alternating (or some designed) pattern is much much much much higher than that of a 3D printed counterpart.

Specific to the direction you want of course

@@adambjohnson yes I had seen that it is a rocket nose, but in France we can call it warhead. I have built hobby rockets and created the nose of the rocket in petg using a 3d printer. I can tell you that it is very solid and light weight. The nose of my rocket is empty and the thickness is 2.5 mm if I remember correctly. beautiful life anyway.

@@dronie8782 thanks for the reply. I know PETG has great strength, and we have printed ours with PETG before, but this is a 1/3rd scale so the real version is very long and wide. A printed nose cone will add up the weight fast. A comparable printed version was 4x the weight. Yes, 3D printing is fantastic for many things but this is not the purpose of this video or our work. The fiberglass is RF transparent (same would be for printed plastic), but again you are stuck with 105C glass transition for PETG or lower for other materials.

I’ll add something on the next video to show the air being pushed!

The schematic and code are available now. If you are doing a substantial amount of your own work and it does not copy my work to fulfill the requirements of the project, then sure. You should check with your professor first.

@@adambjohnson i will use many modification and improvement for it. This project is amazing!

@@azureid691 I am conducting a number of changes and upgrades to the mechanical components over the next couple weeks so keep watching the Thingiverse post. The V2 electronics, schematic, and instructions are released now!

Would need be be abel to provide ~12V and at least 3-4A, so something with at least a few Ah. No reference, sorry!

@@adambjohnson no problem thanks you 👌🏻

I didn't design it off of any single engine type. It combines features from a number of engines into one, mostly for looks. 🙂

Check the thingiverse page