Questions:
Click
the green check mark on the left to see the answer 

1. How fast do Cessna 150152's fly ? 

2. How much weight can a Cessna 150152 carry ? 

3. What kind of gas mileage does a Cessna
150152 get ? 

4. How far can a Cessna 150152 fly on a tank
of gas ? 

5. How high can a Cessna 150152 fly ? 

6. How much runway does a Cessna 150152
require ?


7. What is the "Stall" speed of a
Cessna 150152 ? 
Answers:
Performance figures are averages of
all models equipped with standard horsepower engines. Club Members can obtain
performance specifications for individual models in the
member's area. 
Q:

1. How fast do Cessna 150152's fly?

A: 
According to Cessna's
specifications the cruising airspeed for a Cessna 150152 is 105 KTS (nautical
miles per hour), which equals 120 MPH (miles per hour). Like other
airplanes, this speed is optimistic. When manufacturers test airplanes for
specifications they set them up for the best possible performance, but
production airplanes rarely meet the "book" numbers. Most Cessna 150152
pilots agree that the airplane's average airspeed is closer to 95 KTS (about 110
MPH).
Keep in mind that airspeed is a
completely different thing than groundspeed. Airspeed is really only useful for
comparing the performance of different airplanes because it describes how fast
an airplane moves through the air. Because the air is rarely still, the distance
an airplane covers in an hour depends on which way the wind is going. Compared
to cars on the ground, a Cessna 150 that is flying at 110 MPH may actually be
going as fast as 150 MPH if a strong wind is going the same direction as the
airplane ( tailwind ). On the other hand, if the Cessna is flying
directly into a strong wind ( headwind ) it would only be traveling about
70 MPH compared to cars.
On a round trip, the wind speeds
cancel each other out like riding a bicycle up a hill and then back down on the
return home. In practice, the winds typically vary from about 5 to 20 MPH,
so the typical groundspeed of a Cessna 150152 is between 90 MPH and 130 MPH.
This is on the slow side for airplanes, but pretty impressive compared to
automobile speeds.
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Q:

2. How much weight can a Cessna 150152 carry?

A: 
The Short Answer:
Between 400 and 500 pounds. The Longer Answer:
The FAA specifies a legal maximum weight limit for all airplanes, known as "gross
weight". For most Cessna 150's the gross weight is 1,600 pounds. (1,670 for
Cessna 152's) For 150's prior to 1964, the gross weight was 1,500 pounds. Though
the maximum weight is the same for each model, each individual airplane has a
different minimum weight, depending on everything from what kind of radios are
installed, to how the airplane is painted and what kind of upholstery it has.
This minimum weight is known as the "empty weight" and doesn't include the
weight of fuel. Each airplane is weighed when it leaves the factory and
it's empty weight is recorded. After that, each time something is added or
removed from the airplane, regulations require that the empty weight be revised
to show the new empty weight of the airplane.
The typical empty weight of a Cessna 150152 is
about 1,100 pounds. (depending somewhat on model, earlier airplanes are
usually lighter, later models usually heavier, which pretty much negates any
perceived advantage of higher gross weight in the later models.)
Figuring out how much an individual airplane can
carry is a simple math problem: Take the gross weight, subtract the empty
weight, and you have a good starting number, called "useful load". For
example, if our gross weight is 1,600 lbs and our empty weight is
1,100 lbs, we have a neat 500 lbs of useful load. We'll need fuel of course, and
let's assume for this example that we want to fill up the tanks. We will have to
subtract the weight of the fuel in order to find out how much weight is
available for people and baggage. The standard tanks on a Cessna 150 hold 26
gallons. Fuel weighs 6 lbs per gallon, times 26 gallons equals a total of 156
lbs. Subtract that from the useful load, and now we have 344 lbs available as "payload".
The FAA considers that the average person weighs 170lbs, so that leaves room for
exactly two average persons.
Of course in the modern world, many of us weigh more
than 170lbs. For a solo pilot, this won't be a problem unless he or she weighs
more than 344 lbs. If that's the case, he or she likely won't be able to fit in
the airplane in the first place, so we can stop worrying about that. The
baggage area on most 150152's can hold up to 120 lbs, which turns out to be
really a lot of stuff. The baggage area is quite large on these airplanes ( big
enough to hold an extra seat with a child weighing up to 110 lbs! ) For regular
baggage ( clothes, snacks, etc) there is both enough room and weight capacity
for a solo pilot unless you happen to be traveling with your bowling ball
collection.
The problem arises when we add a
passenger. Let's assume that we have a typical couple, a female pilot weighing
130 lbs, and her male passenger weighing 190 lbs. Since their combined weight is
320 lbs, each would be able to bring along a suitcase weighing up to 11 lbs. If
the people weigh more than that, or they need to carry more baggage, the
only option is to carry less fuel. With full fuel the airplane can safely fly
for about 3 hours*. Each gallon removed reduces the
available flight time by about 10 minutes. If the anticipated flight is only 2
hours long instead of three, the pilot could elect to put 20 gallons of fuel in
the tanks instead of 26. In that case there would be room for 36 additional
pounds of people or baggage.
*fuel endurance is highly dependant
on both pilot technique and environmental conditions. The figures quoted are
averages, and not to be used for flight planning. Your mileage will vary.
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Q:

3. What kind of gas mileage does a Cessna 150152
get ?

A: 
The Short Answer:
Between 15 and 22 miles per gallon. The Longer Answer:
A great way to calculate gas mileage for an airplane is to compare it's
efficiency to a car. For starters, an airplane flies in a straight line (
as the crow flies, more or less ), while a car must follow the roads, which
commonly deviate around both natural and man made obstacles. A 300 mile road
trip in a car would typically be reduced by about 1520% in an airplane.
A comparison of a 300 mile trip in a Honda
Sedan vs. a Cessna 150: Using conservative
averages, we will use the government "combined fuel average" for the Honda
Accord of 28 miles per gallon, and assume that the Honda will average 60 miles
per hour. For the Cessna
150, we will assume a reduced distance of 15%, a reasonable average speed of 110 miles per hour, and an
average hourly fuel burn of 6 gallons. 110 miles divided by 6 gallons = 18 miles
per gallon.
Vehicle 
Distance 
Time Enroute 
Gallons per hour 
Total Fuel Used 
Honda Accord 
300 
5 hours 
2.1 
10.2 gallons 
Cessna 150 
255 (15%) 
2 hrs 20 min 
6 
14 gallons 
In this case, though the Honda is more fuel
efficient, the Cessna is clearly more distance and time efficient. Notice
that the Cessna used 38% more fuel, but the trip took 118% longer in the Honda.
We can even make a direct comparison of the fuel costs of the trip because like
the Honda, the Cessna can be operated on regular unleaded car gas. If we assume
a cost of $4.00 per gallon, it would cost a total of $15.60
extra to make the trip in the Cessna. Not a bad premium for turning a 5 hour road trip into a 2 hour and 20 minute flight. (
And the view's better ! )
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Q:

4. How far can a Cessna 150152 fly on a tank of
gas?

A: 
The Short Answer: This
is a fairly simple math problem. For starters, we know that the Cessna will use
between 5 and 9 gallons of fuel an hour, (depending on the individual plane,
and how much throttle is applied by the pilot.) To keep this simple, let's
average the high and low fuel numbers, which gives us an hourly average of 7
gallons. We also know that the average airspeed is about 110 MPH. The normal
tanks on a Cessna 150 contain 22. 5 gallons of useable fuel. We don't want to
run out of fuel, so let's make sure we land with a half hour of gas left over.
Using the average above, we will need 3.5 gallons in the tank when we land. That
leaves us with 19 gallons of fuel to use for the flight. 19 gallons divided by 7
gives us 2.71 hours* X 110 miles per hour = 298 miles of range with
a 30 minute reserve. *(
2 hours and 48 minutes ) The Longer Answer:
If we want to be more precise (and safe piloting technique requires that
we do) we will need to pay attention to at least one more factor. For
starters, we will need to know what the winds are, because that will determine
how much actual ground we will cover in an hour. Since this is a hypothetical
example, we don't have an actual destination, and therefore we can't determine
the winds, so let's create a worst / best range instead.
Using the groundspeed averages from question #1
above, we will assume that the low end of the scale is 90 mph and the high end
of the scale is 130 mph. Doing the same math as in the short answer, we can
determine that the worst groundspeed and worst fuel consumption will give us a
low distance range of 189 miles. The best groundspeed and best fuel consumption
rate will give us a maximum distance of 494 miles. That's quite a wide range,
and it helps explain why some pilots run out of fuel. If a pilot assumes that
full tanks are plenty for a 250 mile trip but doesn't know there is a 20 mph
headwind, that pilot stands a good chance of running out of fuel when they are
still 5060 miles and 3050 minutes short of the intended airport.
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Q:

5. How high can a Cessna 150152 fly?

A: 
The climb performance of individual model years of
Cessna 150152's are very similar, but Cessna seems to have changed their
measuring methods from time to time, so the book maximum altitude figures (
service ceiling ) vary from a low of 12, 650 feet to a high of 15,300 feet.
In actual practice, the climb performance of these
airplanes is sluggish above 9,500 feet. At altitudes above 9,500 typical climb
rates hover around 100 feet per minute, so a climb from 9,500 to 12,500 feet
could easily take 20 minutes to half an hour. Above that, both the crew and the
engine are starving for oxygen. As a practical matter, Cessna 150152 pilots
rarely fly above 9,500 feet, it just takes too much fuel and patience to get
there. The vast majority of Cessna 150152 flying takes place between 2,500 and
6,500 feet.
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Q:

6. How much runway does a Cessna 150152 require?

A: 
When it comes to runways, Cessna 150152's are
surprisingly good performers for airplanes with relatively low horsepower. Like
other specifications, the Cessna "book" numbers are a bit optimistic, Cessna
claims the airplanes can take off in less than 750 feet, and land in less than
500.
Again wind pays a significant role. An airplane
taking off and landing into a strong headwind will use only a small portion of
the distance required without a headwind. At the Cessna 150152 club national
convention takeoff contest, one airplane used just 408 feet of runway for
takeoff (into a headwind). If we remove wind from the equation, the realistic
runway length requirement for a Cessna 150152's takeoff is about 1,500 feet,
about 750 feet is the realistic minimum runway length for landing. With a 1015
knot headwind, these distances can easily be cut in half.
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Q:

7. What is the "stall" speed of a Cessna 150152 ?

A: 
The Short Answer: 4855 MPH (4248
knots) with and without flaps.
The Longer Answer:
Most pilots know that an
airplane does not stall at any particular airspeed, but rather at a given "angle
of attack", this means that an airplane can stall at any airspeed and at any
attitude. (this is demonstrated very effectively by modern aerobatic pilots
who stall and spin their airplanes at high speeds as part of their aerobatic
routines.) Why then are student pilots taught that the airplane will
stall if it slows down too much?
Here's why: In a relatively low performance airplane
like a Cessna 150152, the engine does not generate enough thrust to keep the
airplane flying at a combined low speed / high angle of attack. When the airplane
is flown at slow speeds, the pilot must raise the nose of the airplane to keep it
flying. As the nose rises, the wing gets closer and closer to a critical angle
of attack, (sometimes called the "stall angle of attack"). Pilots are taught to keep
the airplane flying above a certain threshold speed where this is likely to
happen.
Every fixed wing airplane has a performance
"envelope" that varies with aircraft weight, attitude, and environmental
factors. In a Cessna 150152 the low end of this envelope is about
40 miles per hour, (about 35 knots). At this speed and below, the wing is
producing so little lift that altitude cannot be maintained without
exceeding the critical angle of attack, even in level flight. Attempting to climb over obstacles (like trees)
or steer around them makes a stall likely. For the
Cessna 150152 the official "stall" speed (with flaps) is 48 miles per hour (42
knots). Pilots are taught to keep a margin of speed above what is likely to
result in a critical angle of attack. This is why the recommended landing
approach speed with flaps for the Cessna 150152 is 6070 MPH (5260 knots).
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