3D printed 400mm EDF project

Things that fly
SkyersJet   1 mW

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Re: 3D printed 400mm EDF project

Post by SkyersJet » Aug 04 2021 4:52pm

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

sprocati   1 µW

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Re: 3D printed 400mm EDF project

Post by sprocati » Sep 02 2021 7:03am

Very nice project.
Could you provide information about the BLDC motor?
Who manufacturer it?
Which ESC have you used?

Regards

SkyersJet   1 mW

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Re: 3D printed 400mm EDF project

Post by SkyersJet » Oct 12 2021 5:14pm

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

SkyersJet   1 mW

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Re: 3D printed 400mm EDF project

Post by SkyersJet » 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
Attachments
Screenshot 2021-10-12 at 12.12.03 pm.jpg
Screenshot 2021-10-12 at 12.12.03 pm.jpg (139.01 KiB) Viewed 409 times

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nicobie   1 GW

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Re: 3D printed 400mm EDF project

Post by nicobie » Oct 12 2021 8:41pm

Nice.

Can't wait to see the test results.
Ask for it by name.

my eTownie build thread: http://endless-sphere.com/forums/viewto ... =6&t=23701
Magazine article https://www.electricbike.com/nicks-etownie/

BalorNG   100 W

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Re: 3D printed 400mm EDF project

Post by BalorNG » Oct 21 2021 2:54am

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).

SkyersJet   1 mW

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Re: 3D printed 400mm EDF project

Post by SkyersJet » Dec 05 2021 8:40am

These blades are actually PLA.


SkyersJet   1 mW

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Re: 3D printed 400mm EDF project

Post by SkyersJet » Dec 05 2021 8:41am

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

SlowCo   1 MW

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Re: 3D printed 400mm EDF project

Post by SlowCo » Dec 05 2021 8:52am

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?

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fechter   100 GW

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Re: 3D printed 400mm EDF project

Post by fechter » Dec 05 2021 11:39am

I could see the video too. At least it held together this time. Which one gave the most thrust?
"One test is worth a thousand opinions"

SkyersJet   1 mW

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Re: 3D printed 400mm EDF project

Post by SkyersJet » Dec 05 2021 3:49pm

Hmm must be my browser.

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

SkyersJet   1 mW

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Re: 3D printed 400mm EDF project

Post by SkyersJet » Dec 12 2021 3:53pm



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

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