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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Yes if you want to mingle with this model you use openscad. Its a small program so there's no hassle trying it out.
Its easy to swap a few numbers and see what happens to the model by pressing F5.
In your models: If you like to keep everything adjustable till the end and don't mind the more laborous but imo also more rewarding programming it might make your "life a little better".
(note: both sketchup and openscad don't deal too well with fluent free forms or highly overlapping geopetries)
If I want to change it do I use open scad or whatever goes with that extension? I was fooling around in sketchup to make a propeller and found it tricky. Will life be better in another product? Or am I just to novice in Sketchup? :)
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.
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