T
T
e
e
c
c
h
h
n
n
i
i
c
c
a
a
l
l
D
D
e
e
s
s
c
c
r
r
i
i
p
p
t
t
i
i
o
o
n
n
,
,
O
O
p
p
e
e
r
r
a
a
t
t
i
i
n
n
g
g
,
,
M
M
a
a
i
i
n
n
t
t
e
e
n
n
a
a
n
n
c
c
e
e
a
a
n
n
d
d
R
R
e
e
p
p
a
a
i
i
r
r
M
M
a
a
n
n
u
u
a
a
l
l
Document No.: 304S/MM
Date of Issue:
08/14
6-9
H
P
H
Ltd.
B) Now we consider case B), the awful hole through both the inner and outer
skins. It will be necessary to rebuild the inner skin first.
B1) Suppose that one can’t reach the area from behind, and that the hole
through
the inner skin is small.
FIG. 46
Prepare the hole as shown on picture:
FIG. 47
The inner surfaces of the support material are covered thoroughly with epoxy
mixture. Then cover the bottom of the foam piece with glass cloth and saturated
with epoxy.
FIG. 48
Cover the prepared area of the shell with epoxy and insert the fitted part. Apply
light pressure with weights or sand bags. The next steps follow as explained on
Figure 42 and following. The support material, balsa or foam, should be
replaced every time in the described kind. It might be easy to make a foam
support material in a round shape, but it will be very hard to fit it precisely. But
the glass cloth should be cut with round corners.
No bird comes apart if you substitute a foam in a little damage not exactly in its
special kind, but only in an equal strength.
FIG. 49