7-5
7.9.3 Engine operation speeds and limits
Engine type
ROTAX 912 UL
ROTAX 912 ULS
Speed:
Take-off speed
5800 1/min (5 min.)
5800 1/min (5 min.)
Max. continuous
speed
5500 1/min
5500 1/min
Idle speed
ca. 1400 1/min
ca. 1400 1/min
Performance (ISA): (International Standard Atmosphere)
Take-off
performance
59,6 kW (80 BHP) at 5800
1/min
73,5 kW (100 BHP) at
5800 1/min
Max. continuous
performance
58 kW at 5500 1/min
69 kW at 5500 1/min
Acceleration:
Limit of engine
operating at zero
gravity and in
negative „g“
conditions, max.
5 seconds at max. -0,5 g
5 seconds at max, -0,5 g
Reduction ratio:
Crankshaft :
propeller shaft
2,27 : 1
2,43 : 1 (optional)
2,43 : 1
Oil pressure:
Maximum
7 bar (102 psi)
7 bar (102 psi)
Minimum
0,8 bar (12 psi) (below 3500
rpm)
0,8 bar (12 psi) (below
3500 rpm)
Normal
2,0 ÷ 5,0 bar (29 ÷ 73 psi)
(above 3500 rpm)
2,0 ÷ 5,0 bar (29 ÷ 73 psi)
(above 3500 ot/min)
Oil temperature:
Maximum
140°C (285°F)
130°C (266°F)
Minimum
50°C (120°F)
50°C (120°F)
Normal operating
temperature
ca. 90 ÷ 110°C
(190 ÷ 230°F)
ca. 90 ÷ 110°C
(190 ÷ 230°F)
Cylinder head temperature:
Maximum
– reading at
observation point of the
hotter cylinder head, ether
no. 2 or no. 3
150°C (300°F)
135°C (284°F)
Engine start, operating temperature:
Maximum
50°C (120°F)
50°C (120°F)
Minimum
-
25°C (- 13°F)
-
25°C (- 13°F)
Fuel pressure:
Maximum
0,4 bar (5,8 psi)
0,4 bar (5,8 psi)
Minimum
0,15 bar (2,2 psi)
0,15 bar (2,2 psi)
