l
F.8L Falco Construction Manual
8–7
Revision 4, March 1, 2002
30°
40°
50°
60°
70°
80°
90°
100° 110°
Ambient Air Temperature (°F)
70°
80°
90°
100°
110°
120°
130°
140°
150°
160°
170°
180°
190°
200°
210°
220°
230°
240°
Peak Surface Temperature (°F)
(
Soaring
September 1975)
black
brown
red & green
orange & tan
light green
purple & blue
light blue & aluminum
yellow & pink
white
Figure 4
The September 1975 issue of
Soaring
magazine carried an article which reported on a series of tests
done to determine the effect of the color of aircraft paint. A number of foam boxes were made
and covered with fiberglass and then painted various colors. A thermometer was inserted into
each box to record the surface temperature. The ambient air temperature was recorded as well.
The results are shown in Figure 4. Note that at an ambient air temperature of 100°F, the white-
painted surface reached a temperature of 150°F, while the black-painted surface recorded a
temperature in excess of 220°F. Since the temperature performance of epoxy is marginal, if you
build your Falco with epoxy you must paint the airplane white—to use any other color is foolish
and dangerous.
The experience of wooden boats and homebuilt aircraft has been better than the engineering tests
would indicate. We have had two epoxy glue joints fail in the engine compartment of the Falco.
One was the wood blocks for the landing light installation, and the other was a bonded block on
the nose gear door. Other than these two failures, we are not aware of a single glue failure in a
wood boat or homebuilt aircraft that can be attributed to heat. We have talked to a boat builder
who has used West System epoxy for 15 years—even in the engine compartment of racing
boats—without a single glue failure.
The second major limitation of epoxy is the health hazard of using it. All epoxies are toxic
substances and you must observe the manufacturer's recommendations for shop safety. This
usually means a well-ventilated shop, so that you will not breathe the fumes. You should protect
your hands with rubber gloves or a barrier creme—PR88 is the best available.
Содержание F.8L Falco
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