Coaxial 9x47 Propellor, 3Cell, Benchmark

Here is the first set of results for my coaxial benchmarks.  A little bit of explanation:

The column called "9x47 Coaxial benchmark" are the real test result for 2 motors in coaxial configuration. 

The column called "9x47 Coaxial theoretical" is the sum of 1 x 9x47 pull and 1 x 9x47. I added this column the check the % difference between the coaxial real benchmark results and what theoretical would be possible with 2 coaxial motors if there was no efficiency loss.

The column called "9x47 pull x2" is to compare the difference with 2 pull motors side by side.

The column called "9x47 push x2" is to compare the difference with 2 push motors side by side.

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 ~9% efficiency loss between the real benchmark and the theoretical value.

thrust (grams)	9x47 Coaxial benchmark (watt)	9x47 Coaxial theoretical (watt)	9x47 pull   x2 (watt)	9x47 push x2 (watt)	9x47 Coaxial Theo-Bench (%)
50	6,2	5,5	6	5	11,3
100	9,9	10,6	11	10,2	-7,1
150	15,6	15,7	15,8	15,6	-0,6
200	22,2	21,3	21,8	20,8	4,1
250	29,5	27,1	27,8	26,4	8,1
300	37	33,4	34,4	32,4	9,7
350	44,8	40,4	42,4	38,4	9,8
400	53,2	48,6	50	47,2	8,6
450	61,5	55,9	57	54,8	9,1
500	71,1	63,7	65	62,4	10,4
550	79,7	71,5	72,8	70,2	10,3
600	89	80,6	82	79,2	9,4
650	99	89,3	91	87,6	9,8
700	107,1	97,9	100,2	95,6	8,6
750	117	106	108	104	9,4
800	127	116,2	118,6	113,8	8,5

(lower is better)