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HOAC AUSTRIA
DV 20 Flight Manual
5.3.2. Figure 5.2: Cruising Performance
Performance
Engine power in % of max. continuous power.
Pressure
Standard
55 %
65 %
75 %
Altitude
RPM
MP
Fuel Flow
RPM
MP
Fuel Flow
RPM
MP
Fuel Flow
ft.
m
'C
'F
'100
in.
llh
'100
llh
'100
in.
IIh
0
0
1 5
59
20 24.7 1 1 .3 3.0
21
25.7
1 3.0 3.4
22 27.0 1 5.0 4.0
2000
600
1 1
52
20 24.0 1 2.0 3.2
21 24.7 1 3.3 3.5
23 25.7 1 5.3 4.0
4000
1 200
7
45
20 23.3 1 3.0 3.4
22 23.3 1 4.0 3f 24 24.3 1 6.3 4.3
6000
1 800
3
38
21 22.0 1 4.0 3.7
23 22.7 16.3 4.3
24 23.3 1 9.3 5.1
8000
2400
-1
31
22 21 .0 1 5.0 4.0
23 2 1 .7 1 7.7 4.7
24 22.0 1 9.7 5.2
1 0000 3000
-5
24
23 1 9.7 16.0 4.2
24 20.3 1 8.7 4.9
1 2000 3600
-8
1 7
24 1 8.0 1 7.3 4.6
Pressure
Standard
85 %
95 %
1 05 %
Altitude
RPM
MP
Fuel Flow
RPM
MP
Fuel Flow
RPM
MP
Fuel Flow
m
'C
' F
'100
in.
llh
'100
in.
'100
in.
IIh
0
0
1 5
59
24 27.7 1 8.3 4.8
24 28.3 21 .7 5.7 25.5 29.7 25.0
2000
600
1 1
52
24 26.7 18.7 4.9
24 27.7 22.3 5.9
4000
1 200
7
45
24 25.7 21 .0 5.5
Correction of chart under non-standard conditions:
At ISA + 1 0' C (lSA + 18' F): The same power and fuel consumption result if manifold pressure
values are increased by 0.3 inHg and pressure attitude values are decreased by 500 ft. (150 m).
At ISA - 1 0' C (ISA - 1 8'
F):
The same power and fuel consumption result if manifold pressure
values are decreased by 0.3 inHg and pressure altitude values are increased by 500 ft. (150 m).
NOTE
The above chart shows the combinations of RPM and MP which result in
the lowest fuel consumption at a selected power and altitude.
In general it is recommendable for a fast cruise to select 2400 RPM and an
MP that is at least 0.7 inHg below the maximum possible MP at the
respective cruising altitude. This measure reduces fuel consumption
significantly while hardly affecting the cruising speed.
For an economical cruise, it is recommendable to select
a
propeller speed
between 2300 and 2200 RPM and an MP that is 1 -2 inHg below the
maximum possible MP at the respective cruising altitude.
To keep engine wear to a minimum, engine operation below 1 900 RPM is
not recommended.
Revision No.
1
Reference
Date
December 30, 1 994
Page
5 - 4
6.6