Effectivity: 916 i A / C24
Edition 0 / Rev. 1
BRP-Rotax Page 5-3
December 01 2023
Parameters Explanation
power_observ-
ered [kW]
Power observed (certified) at the propeller shaft at given ambient conditions
and engine conditions. This value means the LOWER LIMIT of the power
tolerance range. Depending on circumstances the delivered power can be
up to 6% higher but not lower than the power stated in the engine deck.
The power stated in the engine deck accounts for:
• The use of different certified fuels
• Maximum allowed temperatures of oil and coolant
• Losses due to gear and governor
• Tolerances of the engine
The observed power depends on:
• MAT (T_Plenum): If the MAT exceeds the given limits power will decrease
below stated values of the engine deck (not specified). For given ambient
and engine conditions the MAT and the pressure in the plenum (p_Ple-
num) can be used to evaluate the air path from the intake to the plenum.
• Fuel: With MOGAS the delivered power will be up to 1.4 [kW] higher than
the stated power in the engine deck. Therefore power loss due to the use
of AVGAS is taken into account.
Fuel Flow [kg/h] Fuel flow at given ambient/engine conditions, tolerance range at stationary
flight conditions (5500-5800 rpm > 55 [kW, 4000-5000 rpm >35 [kW]): 10%.
Flight range must be evaluated by the manufacturer in real aircraft
application.
p_plenum [bar] At given ambient/engine conditions the pressure and temperature in the
plenum correlates to engine power. Deviation more than +20 mbar (at 5800
rpm/at sea level) indicates failure in the air supply to the engine.
T_plenum [K] At given ambient/engine conditions the temperature and pressure in the
plenum correlates to engine power. Deviation more than +5 °C (41 °F) (at
5800 rpm/at sea level) indicates failure in the air supply to the engine.
5.3) Performance graphs
NOTE
This is an extract, all date available in ROTAX® performance
and fuel consumption model.
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