Endless Sphere

17.2 kg

I blame the heavy steel ring on the duct for this. The test trolley has got to go as well, too wobbly.

I tried angled fins, it was a flop https://twitter.com/SkyersJet/status/14 ... 0553483269

If you mean an outrunner the problem is torque, not power hence the gearbox.

PDF with more data and theory:
http://www.skyersjet.org/resources/(web ... ciency.pdf

I think I might consider switching to direct drive. The gearbox is still vibrating too much.

Hmm must be my browser.

circular intake gave 5.7kg @1492W and the elliptical one gave 5.8kg @1439W

Can people see the video? I just see a blank.

These blades are actually PLA.

New Prototype

• Wider shaft to prevent flexing
  Drive shaft secured at both ends to prevent vibration
  Washout added to blades
  Duct lengthened to allow air to accelerate
  Thinner walls and shorter screws to save weight
  Narrower gearbox to not obstruct air
  Stators are now aerofoil sections
  Nylon blades

Is this project still going? Did you succeed OP?

Thanks. It's a TP 5870 inrunner. I am running it with a Hobbywing 14s ESC. I previously used a Castle Edge HV 12s ESC

Depends how its loaded. Max load at optimum operating point then yes 90% but if not it will be lower. Finding that point is tricky.

Hi thanks, it looks exactly like the cutaway in the blue diagram. It's just a simple single speed gearbox.

I will make more attempt to balance the next one yes. I will probably do it by sanding.

https://markforged.com/3d-printers/mark-two?utm_source=gads&utm_medium=cpc&utm_campaign=12003716395&utm_content=117251557578&utm_term=%2Bmarkforged%20%2Bmark%20%2Btwo%20%2Bprice&gclid=CjwKCAjwgISIBhBfEiwALE19SQcPfBFXS9USNRAe0pPjJwoxXuFqYS0cl3agrQmoVUSjdljrcRE6BxoClNQQAvD_BwE It'...

I think 3D printed blades can work so long as I stop them from hitting the duct wall.

It needs some more work before I can put it on an EV.

Here is a pic of a "segmented" stator, which allows each stator-tooth to be wound individually before the stator is assembled, which can increase copper-fill, and the speed at which robotic assemblers can wind the coils. https://images.squarespace-cdn.com/content/v1/55b509dfe4b078a4338fbd...

400mm! I know nothing about turbines but they do look good. Great work, what printer are you using and how many parts are in that build as shown? Hi thank you! I use a Creality CR-20 printer to print the parts in PETG. There are 62 parts in the build. How do you like that printer? I assume the impe...

That is correct. I do realize that if l lost power, that unlike an airplane, l would drop like a rock, so yes, l will have battery percentage available to view, during flight. Flying above 5 m is prohibited! And you should do a lot of remote testing with bags of sand before you even put your foot i...

Jordan325ic wrote: ↑

May 27 2021 7:19am

400mm! I know nothing about turbines but they do look good. Great work, what printer are you using and how many parts are in that build as shown?

Hi thank you! I use a Creality CR-20 printer to print the parts in PETG. There are 62 parts in the build.

Well I'll reply back. This is awesome. great job. Could you put into the text the performance you have seen so far? It's harder for me to tease out the values on the gauges at work with no headphones. Hi, thanks for your interest! All of the data is summarised at the end of my videos. In the first ...

I am working on a project to 3D print a large EDF (electric ducted fan). Currently there are no specific applications but I have VTOL in mind. That's why it is large for better disc loading and the pitch is low for better static performance. However changing the blades to a higher pitch for forward ...