Handbuch Slingsby T21 - BGA 782
Seite 6 von 35
FIN
;5.:',
The
fin
is built ictegral
-
with 'tbe 'fuse�
J
3
g
e
.
�
·
The
slern·post or the fuselage acts
.
;8S the fin rear spar, and a second
fin
spar,
'
�
forward of the stern-poSl,
also
acts
as 9.
'
s
eco
n
d
rear· fuselage frame.
:
•
"
.
•
<t
.
,
'
.
.
iANDING WHEEL AND SKIDS
(.fig: 2)
6.
.
The
a
l
i
gh
t
i
ng
gear
comprises" a single
landing wheel and nose and tail skids.
The landing wheel is carried in
a bearer
box
fitted
'
,
ccntrally
in
the
underside 'of
the
fuselage,
:,between
(rames
4
and
5.
The
nose skid' is
anchored at the front to f
r
a
m
e
I
;
'
·
and
is
flexibly
attached to frames
2
aad
1
by
:
cylindrical
.
rubber buffers, wnich
absorb
.
l
aDding shocks .. The o.oderside of
the skid is fitted with
a
metal skid plate
to 'withstand wear. The metal tail skid
is
a
tt
a
c
h
e
d to
the
u
n
der
s
i
d
e of
.
the fuselage
between the fronl
and
rear finposts
..
MAIN PLANE
General
(fig. 1)
7.
.
The
"!lain
p
l
a
ne is �f w�oden mono.spo
r
construction
and
bUilt
In '
two sections
.
which are
joined
together,
and
to the
fuselage
'
neck. at the centre
line
with
shackle pins. The s(ruchlre is
fabricc�vered.:
MAIN SPAR
,
8
.
The
main
s
p
a
r
s are straight and aT':
.,
positioned at one
third
of
the ,chord
aft
of
the leading edge, they
ilre
of box
construe.
tion with
spruce
booms and plywood webs.
'
:
-The spar
is blocked solid at
Ihe
'
root
and
:at
tbe
strut
attachment
and'
uilcron control
:.
pulley p
o
sitions
,
·
Diaphragm members a
re
;fixed inside the spars
'
at
,
approximately every
second
.
rib position,
RIBS
9.
The twenty-seven .main
ribsf
in'
each
,
w
i
n
g are spaced one foot apart .�and are'
constructed with a centre web
of
plywo
o
d,
·
'the spruce members forming
thc
.structure·
of the rib b
e
ins
'
positi
o
ned on'· either side
.
of (his
:
'
p
\
ywo
o
d web. Intermediate ribs
are positioned between the main ribs in
the
oose
bo
.
x rorwar� of the '
spar"
these
extend
from the Icadlng edge
to
the front
'
face of
Ihe main
s
p
a
r
.
WING ATTACHMENTS
.. 10.
,The
·
fronh attachment
·
fittings
:'
3re
'
,
mounted o�
short, stub spars
forward of
.the molin
spar, These fiuings form
a
link
.bet�een the
port.and star\>oard �jngs, and
do
not
'
connect
to
the
fuselage:
.
·
11. The'
wing
:rnain, ·attachment'· 'fittings
are mounted on tnc
main spars;
::.They are.
made from
heavy.gauge duralumin
o
la
t
e
s
'
which
are filted with removable stcel bushes
'in the attacnment holes.
'
.
,
'
12
.,
.
� Trc
wi
n
g
rear a(tachment fitti'ogs
uc
:
�
mo
u
nte
d on
diagonal
spars
aft of the main
,
spar.-=·�,.The fitting is
a
welded steel
assembly,
;:and
·
i
.
5 bolted to the spar and through
an
,
a
n
g
l
e bracket
to
rib l.
.
The d
i
a
g
o
n
a
l
-spar
is
curved at the
root
end,
and passes
through
rib
I
to take
thc
attachment tilling, the
outboard end',being attilched .to the maill
s
p
ar
at rib 5.
.,
FALSE SPAR
'
1
3:
�
'-:
:
A
raIse
"
spar is positioned outboard of
rib .
14
.
:
19
'
:
carry
,
the
.
aileron.' ..
,
This .spar
is
.
buill
'
JJP .from spruce members nnd
is: ply·
,wood covercd
.
�
on its
.
rcar. face:
,.\)
(carries
·.five �:rC?J��iry��d
:
�
y
e-
b
.
olt
.
�
�i
�
�hjch
.
.
;:8cr·
as
.
aileron hinJtes,
AILERONS
14.'
':'The�'''ai\�ron
:
struet ure
:
· '
consists
'"
'0(;'
a.
'main "spar, a
to
r
s
io
n
spar
and
straight Ilnd
diagonal
'
r
i
bs
,
The
main
spar
.
is
'
straight
and
i
s
constructed from spruce members,
which
are
plywood covered,
OD
t
h
e
i
r
forward
face ... ; Five eye·bolts
are fitted to
the spruce
members :to act as hinges, ,The torsion spar
only extends over
the
'
c
en
tre portion of
the
ailerons;,:;t is
'positioned'four
inches
aft
of.
and
t
parall
el
'
.
t
o
,
'
the. main spar.".,';.,The:-gap
between,these
two
s
p
a
r
�
is plywood
covered
to form a
�orsion,box
. .
,.The
aileron ribs are
of
similar'.construction
to the ,wing r
i
b
s
and
l
i
n
e
,
u
'
p -.rp�
position with. the
"!U3.in
ribs in
t
he
'
wIOg.:: 'J'he' end
bays." of
the ail�ron.
which
:
arc
'
not
'
covered
by'
the' torsion' box,
each have-=a'diagonal rib;Flhcse' ribs react
torsion: 10
'
sd
S
'
:
a,nd also' stiffen the structure
,
against
'
the pull
'
of
the
fabric covering.
REST
'
itl <;T.E
0
