22 Lego propellers are tested in a water-filled container. Which one provides the most thrust? Enjoy!

2 non-Lego propellers are also tested for comparison.

Test method: a Lego Buggy motor (5292c01) and 7V input voltage. A weight scale measures the thrust in grams. Multiple gear ratios (from 1:25 to 5:1) and both directions of rotation are tested for each propeller. The test bench is explained in detail starting at 1:46.

Note: the list of gear ratios shown from 3:22 to 3:50 are incorrectly presented as inverse ratios. Sorry about that.

The results can be read in my blog:

Lego propellers water thrust comparison

0:00 propellers worst to best
01:00 RESULTS CHART
01:46 TEST BENCH
04:22 TEST PROCEDURE
05:44 6041 Propeller 3 Blade 3 Diameter with Axle Hole
06:08 4745 Propeller 2 Blade Twisted
06:40 92842 Propeller 3 Blade 5 Diameter
07:12 non-Lego boat propeller – Joysway 2-blade P1.4x40mm 83 series
07:51 30332 Propeller 3 Blade 9 Diameter
08:21 4751c Propeller 4 Blade 13 Diameter without Studs
09:02 2952 Propeller 2 Blade 9 Diameter
09:27 64683 Technic, Panel Fairing 3 Small Smooth Long, Side A
10:10 Lego liftarm propeller 2-blade 14×9 45-deg
11:05 18592 Propeller 3 Blade 13 Diameter (Ninjago Airjitzu)
11:39 41325 Propeller 4 Blade, for Flying Model Helicopter
12:26 2740c01 Technic Propeller 3 Blade with Gear 24 Tooth
13:10 non-Lego drone propeller Diatone Bull Nose 4 x 4.5
13:51 89509 – Propeller 1 Blade 14L with Two Pin Holes and Four Axles
14:41 COMPARISON TEST: 2 vs 4 blades
14:58 COMPARISON TEST: short vs long blades
15:23 COMPARISON TEST: 30 vs 45 vs 60 pitch angle
15:49 COMPARISON TEST: narrow vs wide blades

Music:
Heaven and Hell – Jeremy Blake