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16-Blade EDF Pod For 3-4S Brushless

by MARRA92, published

16-Blade EDF Pod For 3-4S Brushless by MARRA92 May 29, 2017
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2580Views 742Downloads Found in R/C Vehicles

Summary

My first self designed EDF Unit for Brushless Motor. Tested today after printing it with PLA, and mounted on a 2800Kv motor with customized motor-to-fan shaft and 3S LiPo. The fan surprisingly didn't had any issue up to max RPM with have been over 30k RPM, giving a (unmeasured yet) good feelable thrust of about 800g wich will increase with newer versions. The fan is of simple design with 16 blades. I would love suggestions and eventual hints by more expert designers! I know PLA is not the best for this application but this is my very first week of approaching 3D printing world so i just wanted to test out everything.
The motor mounting may look small but it fitted the outrunner i had for the test.

Print Settings

Printer:

Duplicator I3 PLUS


Notes:

Printed with TRONXY 802: white PLA - 210° extruder - 50° bed - 65% overall feed - Repetier sliced low honeycomb infill.

How I Designed This

Designed with Rhinoceros

Self designed

Custom Section

RC Modeling

This Thing is for Radio Controlled planes prolulsion or experimental purposes.
Motor used: Old but prolly still available 2800Kv outrunner combo with 40A ESC ( I think it ddn't had Bec yet) from HK

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Hi, great file. If this is your first attempt, im looking forward to how you evolve and improve this. 800g is not bad for a first run.

Hi there! Yes, first attemp to design something like a EDF with basic design that i could print and test, also I stepped into 3d design same time I started 3D printing, about 2 weeks so far. I'm tryng to make something like a thrust measurement tool to see exactly what's the performance commpared to power consumption.

You might try posting the individual files. As it is, when you drop the single file into Cura, it's unprintable because of your part placement. Also, the fan itself seems to be lacking any kind of hole for the motor shaft or means of retention to a shaft. Joggles between the parts would make them self-aligning and assembly would be much easier.

You might also try using a DF airfoil instead of the wedge design you are using for improved thrust. Bellmouth shrouds are another efficiency improvement you should make.It would smooth the airflow going into the fan, along with a tapered exhaust nozzle that will increase your thrust numbers. Lot's of tech references and info out on the web. Google "rc ducted fan design construction". You won't be sorry you did! Lot's of great ideas out there.

Cheers.

Thanks for the hints! Yes, absolutely it needs some aerodynamic related improvements. I though there would had been no difficulty at all to extract single parts and print them, same for design the hole on the fan ( must be for your motor not mine :D ) About the parts, I used Repetier with my 3d editor, you can either open the stl with a editor for 3D and split the file into the 4 components, rotate them with the program or via the slicer, but I'll do it myself soon! Anyway tomorrow I'll try run it on 4S just to be sure PLA wont disintegrate ( hopefully ).. Do you have any suggestion about type of filement will fit best this application ( in particular the rotating blade ) ?

Regards

I would print them in PETG for the strength although I've heard that if you bake PLA it's also very strong. I haven't tried this myself, but if you print only in PLA you might want to look into doing that. Good luck!

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