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Re: 3D printed 400mm EDF project

Posted: Aug 04 2021 4:52pm
by SkyersJet
Hi thanks, it looks exactly like the cutaway in the blue diagram. It's just a simple single speed gearbox.

Re: 3D printed 400mm EDF project

Posted: Sep 02 2021 7:03am
by sprocati
Very nice project.
Could you provide information about the BLDC motor?
Who manufacturer it?
Which ESC have you used?

Regards

Re: 3D printed 400mm EDF project

Posted: Oct 12 2021 5:14pm
by SkyersJet
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

Re: 3D printed 400mm EDF project

Posted: Oct 12 2021 5:18pm
by SkyersJet
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

Re: 3D printed 400mm EDF project

Posted: Oct 12 2021 8:41pm
by nicobie
Nice.

Can't wait to see the test results.

Re: 3D printed 400mm EDF project

Posted: Oct 21 2021 2:54am
by BalorNG
SkyersJet wrote:
Oct 12 2021 5:18pm
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
Seriously impressive project, might as well use it to propel a bike :)
But unless your nylon is higly CF/GF-filled, it is not that much stiffer than petg in my experience, so you'll still have problems with blades contacting the shroud at high RPMs I suspect. They might *survive* it though, but this is still not very nice...
Using CF/GF filled filament (not nessesarily nylon, CF petg works well according to my tests, to promote epoxy adhesion) and carefully gluing strips of uni CF to stiffen the construction over it will work, but balancing it would be a nightmare (I think it was already suggested).

Re: 3D printed 400mm EDF project

Posted: Dec 05 2021 8:40am
by SkyersJet
These blades are actually PLA.


Re: 3D printed 400mm EDF project

Posted: Dec 05 2021 8:41am
by SkyersJet
Can people see the video? I just see a blank.

Re: 3D printed 400mm EDF project

Posted: Dec 05 2021 8:52am
by SlowCo
Yes I can see/view the video.
Did you also have a thrust measurement in place (suitcase weighting scale) to see the amount and difference in thrust?

Re: 3D printed 400mm EDF project

Posted: Dec 05 2021 11:39am
by fechter
I could see the video too. At least it held together this time. Which one gave the most thrust?

Re: 3D printed 400mm EDF project

Posted: Dec 05 2021 3:49pm
by SkyersJet
Hmm must be my browser.

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

Re: 3D printed 400mm EDF project

Posted: Dec 12 2021 3:53pm
by SkyersJet


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