Cessna 152 - Page 68

SECTION 5
PERFORMANCE
CESSNA
MODEL 152
fuel.
The corresponding distance during the climb is 9 nautical miles.
These values are for a standard temperature (as shown on the climb chart)
and are sufficiently accurate for most flight planning purposes. However,
a further correction for the effect of temperature may be made as noted on
the climb chart. The approximate effect of a non-standard temperature is to
increase the time, fuel, and distance by 10% for ea.ch 10°C above standard
temperature, due to the lower rate of climb. In this case, assuming a
temperature 16°C above standard, the correction would be:
16°C
10
oc x 10% =·16% Increase
With this factor included, the fuel estimate would be calculated as follows:
Fuel to climb, standard temperature
Increase due to non-standard temperature
(1.0 X 16%)
Corrected fuel to climb
1.0
0.2
1.2
Gallons
Using a similar procedure for the distance to climb results in 10 nautical
miles.
The resultant cruise distance is:
Total distance
Climb distance
Cruise distance
320
-10
310
Nautical Miles
With an expected 10 knot headwind, the ground speed for cruise is
predicted to be:
99
-10
89
Knots
Therefore, the time required for the cruise portion of the trip is:
310
Nautical Miles=
3
_
5
Hours
89 Knots
The fuel required for cruise is:
3.5
hours x 5.2 gallons/hour = 18.2 Gallons
5-6
1
July 1978