Page 618 - PPL-engelsk 2025

Flight performance and planning

The number of kg is added together, and moments in 100 kgcm (extreme column

on the right) are also added together.

The new moment arm, or the new center of gravity, is found by saying:

1200 x 100 / 1064 = 113 cm

The center of gravity without gasoline is ok, since 113 cm lies between 96 and 117

cm. We can now calculate how much fuel we can have, because the maximum
take-off weight is 1200 kg, and we weigh 1064 kg. So, there is room for 136 kg,

but only 107 kg is filled.

The new center of gravity is also calculated to be at 113. It is a good feature that

using gasoline does not significantly move the center of gravity.

Below you can see an empty table where you can calculate the center of gravity

yourself for other weight ratios.

Weight Kg Moment arm cm Moment arm
in 100 kgcm

Empty weight 724 104 752
Pilot 70
Passenger front seat 70
Passenger back seat 160
Luggage 230
Dry weight (ZFW) Udregnes*
(takeoff weight – benzin)

Benzin
Takeoff weight
Center of gravity between 96 og 117
Max takeoff weight(MTOW) 1200

There are other methods for determining weight and center of gravity, but we will

not go into them here, but if you follow the lesson, you will get a few samples

here.

Flyveteori PPL(A)(UL)/LAPL Henning Andersen, Midtjysk Flyveskole© 2025 618