Eiri KY PIK-20 E - Eiri Ky; Sample Problem: Actual Weight and C. of G. in Flight

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PIK-20

E

Flight

manual

A

C.

of

G.

position

limits

during

flight

are

minimum

2,267

m

and

maxi



mum

2,443

m.

6.3

Sample

Problem:

Actual

weight

and

C.

of

G.

in

flight

Sample

sail

plane

Your

sailplane

Weight

kg

Arm

m

Moment

kgm

Weight

kg

Arm

m

Moment

kgm

1.

Actual

Empty

Weight

2.

Fuel

20

I

3.

Water

ballast

4.

Pilot

+

parachute

296.3

14.5

60.0

78.0

1.90

2.27

1.48

793.2

27.6

136.2

115.4

1.90

2.27

448.8

2.389

1072.4

wn

Thus

we

get

C.

of

G.

=

4

—

m

=

2.389

m

8

Without

water

ballast

and

fuel

we

get

the

backmost

C.

of

G.

=

793.2

+

115.4

=

908.6

=

2.427

m

296.3

+

78

374.3

being

16.0

mm

foreward

of

the

allowed

aft

limit.

Note

1:

The

extending

of

the

engine

subtracts

the

moment

by

16.5

kgm

ie.

the

extending

moves

the

C.

of

G.

of

the

loaded

sailplane

(empty

weight

+

pilot

+

water

ballast

+

fuel)

some

48.

.

.34

mm

foreward

de



pending

on

the

total

weight

of

the

sailplane.

EIRI

KY

V

Kisällinkatu

8

SF-15170

Lahti

17

page

I-40

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Service Manual49 pages