Coaxial 9x47 + 10x45 Propellor, 3Cell, Benchmark

This is the first coaxial mixed propellor benchmark. Using a different top and bottom prop might have negative or positive influence on the efficiency. 

"Coaxial 9x47 + 10x45": the first prop will always be the top proller (pull) the second prop will always be the bottom prop (push). So in this case I'm using a small prop on top and a bigger one underneath it. The pitch of both prop is ~ identical.

In the table and graph below I compare the result with the results of the standard coaxial 9x47 setup and the standaard coaxial 10x45 setup. And also the theoratical value of what this combination should perform.

Because the 10x45 coax setup performs less than a 9x47 I expected that the result for this benchmark would be in middle of these two. So no suprise here.

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 ~15% efficiency loss between the real benchmark and the theoretical value. 

thrust (grams)	9x47 + 10x45 benchmark (watt)	9x47 + 10x45 theoretical (watt)	9x47 Coaxial benchmark (watt)	10x45 Coaxial benchmark (watt)	9x47 + 1047 Theo-Bench (%)
50	6,6	5,6	6,2	6,5	15,2
100	12,1	10,4	9,9	12,5	14,0
150	18,7	15,5	15,6	18,9	17,1
200	24,3	21,5	22,2	26,3	11,5
250	32,5	27,7	29,5	34,3	14,8
300	40,6	34	37	42,8	16,3
350	49,2	41,2	44,8	51,1	16,3
400	57,5	48,6	53,2	58,5	15,5
450	66,4	55,9	61,5	68,5	15,8
500	75,8	64,5	71,1	77,5	14,9
550	84,8	72,6	79,7	88,6	14,4
600	96	82,9	89	99,3	13,6
650	107,2	91,3	99	112,6	14,8
700	114,3	99,3	107,1	122,3	13,1
750	122,6	107,4	117	135	12,4
800	133,8	118	127	145,8	11,8

(lower is better)