Coaxial 11x47 Propellor, 3Cell, Benchmark

The benchmark voor the coaxial 11x47 prop is again suprising, but this time in a negative way. Although this prop proved to perform very well in single configuration it turns out that in my coaxial setup it has a huge efficiency loss.

For my Y6 project I need 225 grams of thrust per motor. That is 450grams of thrust per pair. At 450 grams of thrust there is ~20% efficiency loss between the real benchmark and the theoretical value.

thrust (grams)	11x47 Coaxial benchmark (watt)	11x47 Coaxial theoretical (watt)	11x47 pull x2 (watt)	11x47 push x2 (watt)	11x47 Coaxial Theo-Bench (%)
50	5,4	5,4	5,4	5,4	0,0
100	10,5	9,6	9,6	9,6	8,6
150	16,7	15	15	15	10,2
200	23	19,7	20	19,4	14,3
250	29,5	25,5	26	25	13,6
300	37,2	31,6	32,2	31	15,1
350	45,9	37,6	38,6	36,6	18,1
400	55,1	44,4	45,4	43,4	19,4
450	64,2	51,7	53	50,4	19,5
500	72,1	59,1	60,4	57,8	18,0
550	82,5	66,4	68	64,8	19,5
600	94,1	73,6	74,8	72,4	21,8
650	106,1	82,9	83,4	82,4	21,9
700	118	93,5	94	93	20,8
750	132,5	99,4	99,8	99	25,0
800	139,1	109,6	110	109,2	21,2

(lower is better)