Rand-Kar X-AIR HANUMAN 602T AP User Manual page 24

3-4 Rotax 912 S
3-4.1 Manufacturer
Rotax Gesmbh & Co KG
Motorenfabrik, Welser STR 32
4623 Guunskirchen / Austria
3-4.2 Technical datas
4 cylinders 4 stroke
Air/Water/oil cooled
1211 cc
79 hp (58 KW) at 5800 tr/mn
Gearbox 1 :2,273
Double ignition
Fuel : Mixture unleaded 95 octane
Oil : 4 stroke engine oil following engine manufacturer's instructions
3-4.3 Propeller
-Two or three blades ARPLAST
Material : composite
-Two or three blades DUC
Material : composite
-Two blades ULX
Material :wood
3-4.4 Noise pollution
The most unfavourable case is a noise heard under trajectory when aircraft has just
taken off, full throttle, optimum climb speed.
QNH : 1010
50m
soundmeter
Example: heard noise by an observer located at 100m under the plane trajectory:
~300m
Lm = 71 dB a
Heard noise under trajectory Lh at a flight altitude h:
Lh = Lm – 22 log (h/50)
Lh = 69 - 22 log(100/50) = 64.38 dB a
: 17°C
θ
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