Eiri KY PIK-20 E - Page 61

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PIK-20

E

Flight

manual

80

100

120

140

160

180

200

220

240

V

EAS

(km/h)

FIG

7.10:

McCready

curves

as

a

function

of

V

EAS

at

ISA

+5°

1

W

=

380

kg

h

=

0

km

2

W

=

380

kg

h

=

2.0

km

3

W

=

450

kg

h

=

0

km

4

W

=

450

kg

h

=

2.0

km

7.5

Use

of

the

water

ballast

The

optimum

use

of

the

water

ballast

depends

on

the

thermal

shape

and

strength.

The

average

rate

of

climb

in

thermal

goes

down

normally

0.25

—

0.4

m/s

with

100

kg

of

weight

Increment.

So

in

normal

thermal

flight

up

to

1.5

m/s

average

climb,

the

sailplane

should

be

so

light

as

possible

(W/S

=

36

—

38

kg/m

2).

With

an

average

climb

of

1.5

—

2.5

m/s

the

re



commended

wing

loading

is

(W/S

=

41-43

kg/m

2

.

Over

2.5

m/s

the

use

of

the

maximum

wing

loading

(W/S

=

47

kg/m

2

)

is

recommended.

V

eiri

ky

Kisällinkatu

8

SF-15170

Lahti

17

page

1-53

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