SEP1 - Performance Data

Question 1

Does an increase in weight affect the glide angle?

Answer 1

Any variation in mass does not affect the gliding angle. as it depends on the ratio of lift to drag, which is independent of weight.

Question 2

When using the time, fuel and distance to climb how to calculate the GNM from ANM?

Answer 2

GNM = ANM + (time divided by 60 times wind component)

Note: remember to multiply negative wind if headwind, positive if tailwind. I.E x -15 and x 15

Question 3

How to calculate time, distance and fuel from one altitude to another?

Answer 3

Start with calculating the lower value, then calculate the higher value. Subtract the lower value from the higher one. If calculating ground nautical miles, remember to use the total TTC and DTC.

Question 4

When using range graph, how to calculate ground distance from air distance?

Answer 4

Ground distance = GS / TAS x Air distance

Question 5

How to add slope to take-off calculation?

Answer 5

Divide the result by 100 x (slope percentage). No correction permitted for downslope

Question 6

For take-off Distance graph, when given runway length, take-off weight limit and given restrictions, how to calculate?

Answer 6

Take the runway length and divide it by the restriction accordingly I.E:

Runway length 2300ft

If Wet grass, take-off distance should be multiplied by 1.3

If no CWY or SWY, take-off distance should be multiplied by 1.2

Now, take the runway length and divide it by those values.

Start from the left side and calculate like you normally would, but stop at the weight reference line and make a dot. Now start with the calculated runway length from the vary right side of the graph, work in reverse until at the wind component reference line. From the wind reference line, make a horizontal line straight to the weight reference line. Where to two line intersect, when continuing with the initial calculation, is where you can find your mass limit.

Question 7

When using the “climb” graph, how to calculate “Ground distance covered to reach a given height”?

Answer 7

First we need:

TAS: 105

GS: 95

The height that we need to reach(Minus the screen height of 50ft since 50ft is the end of our take-off distance required): 800ft

Climb Gradient: 9.6%

Now:

Still air distance = height difference divided by gradient x 100

= 8 333ft

Then, Ground Distance:

95 divided by 105 x 8 333ft

= 7539

7539 / 6080 =

1.24nm

Question 8

Add 5% to the LDR for every 1% down slope:

1% down slope, LDR 2000ft, what is the correction?

Not allowed to divide in order to find percentage

Answer 8

2000ft x 1.05 =

2100ft

Question 9

Add 5% to the LDR for every 1% down slope:

2% down slope, LDR 2000ft, what is the correction?

Not allowed to divide in order to find percentage.

Answer 9

2000ft x 1.1 =

2200ft

Question 10

Is the rate of climb affected by wind?

Answer 10

No, the rate of climb is independent of wind.

Question 11

How to find the exact point a curve will interact?

Answer 11

At your current reference line, count the blocks from the bottom reference line to the top one. Now do the same at the two bottom and top reference lines you are going.

Divide the one by the other to find a ratio:

If X = 4

and Z = 7

Z divided by X means that for every one X there will 1.75 Z’s.

Now count the blocks from the bottom reference to your initial point and multiply it by the ratio number.

Question 12

If a power option is given for either the range or endurance graph, the option that should be chosen is?

Answer 12

Power SET. Only use the “set” power option