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Archive for February, 2019
Posted by japim | Feb 19, 2019 @ 05:07 AM | 2,028 Views
Here is another iteration (rev 8 actually) of the scale look a like of propeller for P-61 Black Widow.

This time fixed prop.
Bolted hub with 4 x M2 screws.
To maintain the best print orientation for strength the blades are printed on the back edge. But a clever support was needed to account for blade curvature.

This time parts are printed in ABS so I can achieve better surface quality after sanding.
I achieved 305g of thrust @ 94W that makes 3.24g/W.

Basically it is the best result among all tested propellers so far on this motor (Cobra 2208- 2000kV @ 2S) - including commercially available propellers.
I have not compared it to GWS props yet.

You can also see what is the difference between sanded and non sanded version: almost 25% in case of rev. 7