Two Blade Propeller
by mechadense, published
It is optimized for supportless printing (blades are oriented vertically)
and designd out of two parts so that even on small buildspace printers pretty big propellers can be made.
Some ideas for improvement:
> add grooves for ball bearings
> design a fitting weather vane and a fitting mount
> add butten-cell powerd laserpointers to get a free lasershow at squally new moon nights
> generalize to 3 or more blades (4 noncoplanar should be easy)
> alter the blade shapes to something less classic but more fancy
> mount (suitable!) whistles to the tips (so your child wont be overheard when cycling), but don't forget the (slidable?) muting plugs then.
Or you might wanna go crazy and do something like this:
>right now its just a toy but one could:
>>modify the blade to a more aerodynamic teardropshape
>>twist the blade
>>make a coupling for a dynamo
> make the bladeangle physically adjustable
# print a lot of them all with different random parameters in reasonable margins and mount them on a kind of "wind sculpture"
Again: the appended stl is only an example!
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Using it as an esthetically looking toy driven by the wind (no ball bearings) should be save because the speeds don't get too high I think. As it is now it is not really fit as a means of propulsion because it's blades are not optimized and even have rectangular crossections. If nevertheless anyone trys to mount it on a motor then PLEASE BE CAREFUL!! Note that the horizontal print orientation shoud lead to a pretty high tensile strenght in the axial direction. Do not print it upright. The print-layers would represent rated break points not to mention the resulting horrible overhangs.
I would so love to print propeller blades but it scares the hell out of me. I picture a crash where a normal propeller would break/snap, but a printed part either causes small bits to fly off at extreme speeds, or worse, part of the print extending into a long plastic line, still being spun like a weed wacker. It feels like a very dangerous idea. I'll be happy if it turns out that I'm wrong, but that's my fear.
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