Instructions

Safety Instructions | 13
withothervisibledeformationorleaks.Donotattempttochargesuchrechargeable
batteries!Dangerofre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
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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/ight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.
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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specications,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:
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Neverstandtothesideorinfrontofthepropeller’srotationplane!
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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.