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400mm EDF Project

Old 03-15-2022, 11:37 PM
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SkyersJet
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Default 400mm EDF Project

I've always wanted an EDF that was bigger than 200mm without having to pay thousands so I started this project to 3D print a 400mm size EDF. It is printed out of PolyMax PLA and powered by a TP5870 inrunner. The planned thrust is 22kg on 12s or 25kg on 14s. Let me know what you think!
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Old 03-16-2022, 05:58 AM
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Wildflyer
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Hope it works, and doesn't blow the blades out the wall.
Schubler has 195mm that puts out 25kg but it is expensive.
https://www.turbines-rc.com/en/schub...fan-motor.html
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Old 03-16-2022, 03:37 PM
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SkyersJet
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That only happened twice
Normally it doesn't blow up
but vibration is still a problem.

My EDF is twice the size and double the weight of that EDF yet I have still not managed to match its thrust. I take my hat off to those guys. My EDF has better g/W at least but that is merely because it is bigger. However that's one of the reasons behind my project; an EDF would have better g/W if it were bigger.
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Old 03-16-2022, 06:38 PM
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Wildflyer
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I had a factory-made plastic 70mm EDF blow its blades on the 4S battery it was rated to handle. I thought it was going to cut the plane in two.
I don't run anything except metal blade fans now.

It would seem to me that the larger a fan gets, the force on the blades to destroy them, goes up, probably the square of the increase.
(2x size maybe 4x the force) That may not be the correct formula but close, it works that way in many things.

The slightest bit out of either static balance or dynamic balance will find a harmonic point that will amplify it to destructive levels.
If there is the slightest bubble in your 3D print of the blades, It may be surprising.

Please don't get me wrong, I wish you luck with your project.
I still remember the instructions about cutting a fan blade out of sheet metal and bolting it to a nitro engine. Thankfully the RPMs were low (below 15,000 anyway) so the forces didn't build up too bad. Although one guy showed what happened when he overcut one blade a little and it went out through the side of the plane, followed shortly by the rest. (I have read every model book I could get my hands on since 1959)

I have a friend that is going to buy the Schubler fan because it is cheaper than a turbine and does not need the turbine waiver or have the restrictions on flying that many sites have on turbines. I don't know of a field within 100 miles of me that allows turbines, especially in dry weather.

Again, Good Luck, be careful, small flying bits can be dangerous. I had a 4.5" saw blade turning 11,000 rpm start throwing its teeth off. some of them were embedded in the sheetrock 8 feet away. The blade was over tempered and brittle.
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Old 03-17-2022, 03:27 PM
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SkyersJet
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I've been doing this project for 2 years, it's only ever exploded twice in that time and I even downgraded the blades from 100% infill PETG to 40% infill PLA and people are still skeptical of it lol. None of the explosions were even anything to do with the blades, Both were caused by a wobbling shaft. The vibrations in the last test were probably due to the addition of a heavy steel ring on the duct, it didn't vibrate that badly in previous tests.
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Old 03-17-2022, 04:17 PM
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ron_van_sommeren
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Are you familiar with these two channels?
www.youtube.com/c/ChristophLaimer, printing motors, bearings and props.
www.youtube.com/channel/UCPWhwy5cHKdrLYIpLSv6fhw, printing a pylon racer.

Last edited by ron_van_sommeren; 03-17-2022 at 04:49 PM.
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