SCHEMPP-HIRTH FLUGZEUGBAU GmbH, KIRCHHEIM/TECK
Arcus M
FLIGHT MANUAL
7.12 Electrical system
Gliding avionics
When operated in the plain sailplane configuration, the minimum instrumentation
prescribed does not require an electrical power source.
Additional- equipment is to be wired as shown on page 7.12.3 and 7.12.4
“ELECTRICAL SYSTEM – AVIONICS” and must comply with the manufacturer’s
instructions for the relevant instrument(s).
Power for the avionics is supplied by one or more batteries, see pages 7.12.3 and
7.12.4.
It is possible to use different battery types which need to have appropriate security
mechanisms:
Sealed Lead-Acid-Batteries resp. Nickel-Metallhydride-Batteries:
These battery types have to be equipped with an appropriate circuit breaker. If
these batteries are to be charged during flight by solar cells, a suitable charge
controller has to be toggled between the solar cells and the batteries.
Lithium-Ion-, Lithium-Iron-Phosphate batteries or similar types:
These battery-types need to have a security level comparable to the normally used
sealed lead-acid batteries:
-
there has to be an intern protection against short-circuit, that reacts in a short
time interval (approx. 100 ms) if the electric current is too high (> 40 A).
-
if problems due to increased temperatures can occur with the used battery
type (i.e. Lithium-Ion-batteries), the battery has to have a temperature-
monitoring system of all single cells, that will deactivate the battery at high
temperatures.
-
if problems due to defects of one single cell can occur with the used battery
type (i.e. Lithium-Ion-batteries), the voltage stage of each individual cell
within the battery pack has to be monitored and the battery has to be
deactivated, if a defect in one cell will occur.
-
if problems due to total discharge can occur with the used battery type, the
battery has to be equipped with a respective deep discharge protection, that
will deactivate the battery before the critical voltage state will be reached.
Furthermore it is recommended to monitor the charging voltage, so that
overcharging of the battery and thus destruction of the battery will be avoided.
If the battery will be charged during flight with solar cells, a adequate charge
controller has to be used.
October 2011
Revision --
7.12.1
