Spektrum SPMAR7110 - Handbuch (Seite 9)

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In the above example the average current was 1.15 amps, which calculates to
153mAh per 8 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 2000mAh batteries 2000 x 60% = 1200mAh (available usable
capacity) divided by the capacity used per 8 minute flight, 153mAh would allow up
to 7 flights of 8 minutes each.
Recommended Guidelines for Battery Capacity
For 50-size electric and glow powered helicopters a minimum capacity of
2000mAh is recommended. For 90-size helicopters a minimum of 3000mAh is
recommended. Our staff uses 2000mAh LiPos in 50-size helis and 4000mAh LiPos
in 90-size machines and typically flies 4 or 5 flights then recharges. Following is a
picture of a typically recommended installation.