I haven’t released anything yet, because I haven’t spun it up yet. I need to get a reasonably detailed stress calculation done before I spin this up to speed; which I’m working on now. Safety first.
Just discovered the DOF feature on my phone camera. 
I cant wait for you to release the files! This prop looks amazing
I’d spin it up in a destroyable reinforced box, run it for at least 10 minutes and if it survives, it’s good.
Something like an old dresser. Screw the motor down, run wires outside the drawer, stand back, and let 'er rip.
I like @ThantiK 's idea, but after the stress calculations are done. Then if it blows up as predicted, we have a confirmed mathematical model to use in further development or even just to determine max safe rpm.
I have 10x4.7 3d printable model which I already tested. It flies quite okay. I think they have %20 less efficiency compared to actual nylon propellers due to thickness. Because I had to adjust that much with control stick.
You can get the model here : http://www.thingiverse.com/thing:570836
If it were me, it slap four on my quad, stand close, hover at eye height for a while, dance underneath it, say hi to mom and go for acrobatics before a high altitude test on low battery.
But that’s just me.
Brook
Alright, the code now reports the stress along the blade length due to centripetal force. It looks like this propeller is well under yield strength at the RPM I’m going to operate at (10,000-15,000 RPM). Looking at a factor of safety of about 2.8.
Hey @Ahmet_YILDIRIM , I’ve seen that video of yours before in my google searches for 3D printed propellers! Thanks for sharing. I think I need to eventually do performance measurements of my prop designs, and compare against commercial props.
Suck it and see
Well, balancing the prop isn’t a problem if its printed solid. Sanding removes material till balance is achieved.
Whether each blade produces balanced lift/drag loading in operation remains to be seen. Vibration may still be a problem.
Keep you posted.
I spun it up and it almost made it to top speed when the hub started slipping. Will try again tonight.
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