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Spektrum SPMAR12120 User Manual

Page 6

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6

The following setup is shown as a worst-case scenario indicative of some

aerobatic pilots’ setups. It is not recommended to use this setup without proper

voltage regulation for your servos.

Airplane 40% YAK

Servos 9-JR8711’s 1-8317 (throttle)

Batteries Two 4000mAh 2-cell 7.4-volt Li-Pos

Regulator None

Engine DA150

Weight 40 lb

Flight envelope Aggressive 3D

Average current 2.62 amps

Peak current 17.8 amps

Milliamps (used per 10-minute flight) 435mAh

JR8711’s and 8317’s are rated at a maximum of 6-volt 5-cell use. Using higher

voltages will void the warranty.

File: JasonNoll.FDR Session:All Sessions

Seconds

350

300

250

200

150

100

50

Pa

ck

Am

ps

_A

18

17

16

15

14

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12

11

10

9

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2

1

0

PackAmps_A: Min 0.00 Max 17.80 Avg 2.62

450

400

0

In the example above, the average current was 2.62 amps, which calculates to

435mAh per 10 minutes (typical flight length). It’s recommended that only 60% of

the available capacity be used to ensure plenty of reserve battery capacity. In this

example using two 4000mAh batteries (8000mAh total capacity) x 60%= 4800mAh

(available usable capacity) divided by the capacity used per 10-minute flight,

435mAh would allow up to 11 flights, of 10 minutes each.