CEI Conrad Electronic International Limited RCE-NAVIGATOR User Manual

Safety Instructions  |  13

 

Keep rechargeable LiPo batteries away from children. Store rechargeable batteries in

a dry, cool place.

 

If a rechargeable battery is deformed or damaged during a crash, it must no longer be

used. The same applies for “swollen” rechargeable batteries, or rechargeable batteries

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.

 

The  general  hazard  notices  for  handling  batteries  and  rechargeable  batteries  also

apply to rechargeable LiPo batteries.

 

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.

 

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.

 

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.

 

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.

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.