RC Logger 88016RC (RtF), Operating Instructions Manual

Page: 13 / 44

Safety Instructions | 13
with other visible deformation or leaks. Do not attempt to charge such rechargeable
batteries! Danger of fire and explosion! Dispose of such rechargeable batteries in an
ecologically sound fashion.
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The general hazard notices for handling batteries and rechargeable batteries also
apply to rechargeable LiPo batteries.
Total discharge
■
Since discharging below 3.0 V per cell would lead to permanent damage of the
rechargeable battery pack, this total discharging is to be prevented as far as possible.
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For safety reasons, programmable cruise controls/flight control systems should be set
in such a way that the undervoltage detection has already responded before a voltage
of 3.0 V per cell is reached (e.g. 3.2 V). Alternatively, optical undervoltage displays are
also recommended.
Correct dimensioning
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As the current drawn rises, the battery pack warms and the usable capacity is lowered.
The ideal operating temperature during discharge is between +20 and +40 °C and must
not exceed +60 °C even under extreme load.
■
The maximum short-time discharge current is stated in the technical data sheets or can
be read directly from the battery pack. The value “C” always refers to the capacity value
of the respective battery pack.
Example:
A battery pack with a capacity of 2100 mAh and ”20 C” can be dis-
charged with 2100 mA x 20 = 42 A maximum.
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However, the maximum permissible continuous current is clearly lower. If there are no
precise manufacturer’s specifications, the battery pack should not be discharged with
more than approx. 50 % of the maximum permissible surge current over a long term.
12.6 Propellers
Only use Navigator 250 propellers from RC Logger!
The propellers are only designed for use with electric
motors.
Do not use the propellers if the peripheral speed of the blade tip is more than 157 m/s. The
maximum revolutions per minute (n) depend on the diameter (d) of the propeller and can
be calculated as follows:
n = revolutions per minute (RPM)
k = constant = 3000
d = diameter (Ø) of the propeller in m
n = k/d = 3000/d
Example:
d = 20 cm = 0.2 m
k = 3000
n = 3000 / 0.2 = 15000 RPM
In order to prevent a loss of strength, the moisture contained in the material must be
preserved, therefore store the propeller in a cool and damp environment.
Proceed with caution when using rotating propellers:
▬
Never stand to the side or in front of the propeller’s rotation plane!
▬
Do not use damaged propellers.
Disclaimer: Although the utmost care has been taken during material selection and
production, the manufacturer cannot bear responsibility for liability claims or consequential
damages arising from the use of our propellers, as it is not possible to verify whether the
propellers were used and handled properly.