Micro RC Pusher Propellers V1

THESE HAVE NOT BEEN FLOWN YET. PROTOTYPE DESIGN NEEDING REFINEMENT! AND ALMOST FOOLISH TO TRY BUT THAT'S NOT STOPPING ME. PROCEED ACCORDINGLY.

ON THE MODEL THESE WERE DESIGNED FOR, THE ENGINES ARE COUNTERROTATING. THE LEFT MOTOR SPINS COUNTERCLOCKWISE AND RIGHT MOTOR SPINS CLOCKWISE. THE PUSHER PROPS HAVE TO BE INSTALLED ACCORDINGLY TO PROVIDE THRUST AND STEERING!

Each blade is just under 16mm. Root angle is ~35° and tip is about ~27°. This is an absurdly tiny print to try and be this precise. Reynolds number what LOL?!

I printed with a 0.4 nozzle and 0.2 layer lines. The shaft they go on is ~.75mm and the hole is modeled at 0.95mm and, to fit, I stilled need 0.1mm hole compensation with the transparent PETG shown here. Even then, the three blade prop hole fused shut during printing. Given these issues, these are really only suited for pusher prop usage. I did try one in tractor configuration where it spun up to speed and then just pulled itself right off the shaft.

I'm including the three blade version but I haven't gotten that to print and mount properly yet. I think the additional heating time at the hub fused the hole shut with my current settings and filament.

EXTREMELY SENSITIVE PRINT IN EVERY REGARD. The only good news is it's barely 0.2 grams of filament each try. 

In seriousness, these are tiny enough with low contact area that bed adhesion is an issue. You'll need a clean plate and probably a little of your favorite glue. I would not use brims because that'll just introduce a whole other variable.

If you have more experience with propellers or some great questions or ideas, please share :).

Thanks for looking!

HAWK'S WORK RC Paper Plane (Birdy X 2.0)

It's a fun kit!

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