Dont Mind this Post i am just saving it here so i can get back to this post and get info at later time LOL
http://www.aircraft-world.com/prod_datasheets/hm-B40.htmKv and Impedance for B40 Motors
The "wind" is number of turns. Ex: B40 8S has 8 winds
Winds Ri (impedance) Kv (rpm/volt)
S type L type S type L type
4 - 0,0028 - 7531
5 - 0,0044 - 6025
6 0,0052 0,0063 7100 5000
7 0,0071 0,0086 6086 4286
8 0,0092 0,0112 5325 3750
9 0,0118 0,0143 4733 3333
10 0,0150 0,0181 4260 3000
11 0,0175 0,0212 3873 2727
12 0,0213 0,0258 3550 2500
13 0,0247 0,0299 3277 2308
14 0,0287 0,0348 3043 2143
15 0,0327 0,0397 2840 2000
16 0,0379 0,0459 2663 1875
17 0,0418 0,0506 2506 1765
18 0,0471 0,0571 2367 1667
19 0,0537 0,0651 2242 1579
20 0,0585 0,0709 2130 1500
21 0,0644 0,0780 2029 1429
Motor: Weight Diameter Length Shaft Dia. Shaft Length
B40 S 125 g 27,6 mm 47 mm ø 3,17 mm 12 mm
B40 L 158g 27,6 mm 56 mm ø 3,17 mm 12 mm
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http://www.aircraft-world.com/prod_datasheets/hm-C40.htmMotor Weight Diameter Length Shaft Diameter
C40 S 147 g 35,8 mm 53 mm ø 3,17 mm
C40 L 187 g 35,8 mm 63 mm ø 3,17 mm
Ri - Impedance Kv (rpm/volt)
Winds S L S L
4 0.0024 0.00284 - 7531
5 0.0037 0.00447 6942 6025
6 0.0052 0.0063 6942 5000
7 0.0071 0.0086 5950 4286
8 0.0092 0.0112 5250 3750
9 0.0118 0.0143 4667 3333
10 0.0146 0.0177 4200 3000
11 0.0175 0.0212 3818 2727
12 0.0213 0.0258 3500 2500
13 0.0247 0.0299 3231 2308
14 0.0287 0.0348 3000 2143
15 0.0327 0.0397 2800 2000
16 0.0379 0.0459 2625 1875
17 0.0418 0.0506 2471 1765
18 0.0486 0.0589 2319 1667
19 0.0537 0.0651 2197 1579
20 0.0585 0.0709 2087 1500
21 0.0644 0.0780 1988 1429
Model Type Examples Motor Type Cells Performance Level - Pinion
Helicopters Voyager
7-cell C40-10S 7x2400mAh Sport motor for 7 cells
light, easy to fly
Voyager
8-cell C40-10S 8x2400mAh Aerobatic motor for 8 cells
17-tooth pinion
Voyager
8-cell C40-11S 8x2400mAh 8 cell Sport, Std pinion
Ideal for beginner/hovering flight
Voyager
10-cell C40-12S 10x2400mAh Intermediate power/duration balance
Std pinion
Voyager
10-cell Aerobatics C40-11S 10x2400mAh Aerobatic motor for 10 cells
Standard pinion
ECO 8
8-cell C40-14S 8x2400mAh Sport motor, 10-tooth pinion
for long flights
ECO 8
8-cell Aerobatics C40-14S 8x2400mAh Aerobatic Motor
12-tooth or 13-tooth pinion
ECO 8
10-cell Power C40-14S 10x2400mAh Power Motor
10-tooth pinion
ECO 8
10-cell Aerobatics C40-14S 10x2400mAh Aerobatic Motor
11-tooth or 12-tooth pinion
EP Concept SR
7-cell C40-11S 7x2400mAh Power - standard pinion
EP Concept SR
8-cell C40-12S 8x2400mAh Aerobatics - standard pinion
EP Concept SR
8-cell C40-14S 8x2400mAh Sport motor - standard pinion
EP Concept SR
10-cell C40-14S 10x2400mAh Aerobatics
LMH 110 C40-11S 6x2400mAh 10-tooth pinion
LMH 110 C40-14S 8x2400mAh 10-tooth pinion
LMH 120 C40-14S 8x2400mAh 9-tooth pinion - 4°
RC Cars 2WD, 1/12 C40-12S 6x3000mAh Strong motor with long run time
4WD, 1/10 C40-6S 6x3000mAh Extreme power for large courses only
4WD, 1/10 C40-8S 6x3000mAh Competition motor
4WD, 1/10 C40-10S 6x3000mAh Performance motor
Monster Trucks E-MAXX 2 x C40-11S 2x6x3000mAh Monster performance, light weight