Silverwing AEROPRAKT A22 FOXBAT, Manual

Page: 175 / 185

Page 176 - © SilverWing Aviation, 2005
5. Carry out first-stage fabric shrink with a large heat iron set to medium.
NEVER use a heat blowgun!
6. Brush the 9:1 MEK/cement mixture through fabric at inner contact
points as in #4 above and allow the cement to dry.
7. Tidy up job with small heat iron set to medium, the iron can be used to
soften and smooth set cement. Use 600-grade wet-and-dry paper to
finish fabric overlaps and a very sharp blade to neatly trim the edges of
the job.
8. Carry out final stage fabric shrink (and tidy up) with your heat irons on
the higher setting.
9. Brush on one weave-sealing coat using a 9:1 non-tautening nitrate
dope/cement mix (NOT the previous 9:1 MEK/cement mix). Add dope
thinners as required for easy smooth brushing (less in warm conditions).
10. Tip: - Try to avoid excessive "drip-through" of liquid, it can sometimes
remain discernible in the paint texture of the finished aircraft when
viewed from certain angles. You can suck still-liquid drips back through
the fabric with a vac cleaner (place a patch of scrap fabric over the vac
nozzle before applying to the job).
11. Brush on four coats of dope thinned as required for quick brushing (ratio
will depend on ambient temperature). Rub with 600-grade paper
between each coat.
12. Position pinked-edge tape strips as required and secure the strips using
the 9:1 weave-sealing mixture. Allow to dry for 24 hours then finish with
600-grade paper to remove any ‘nibs’ of dope or spikey fabric threads.
The following six drawings show the general fabric lay-out of an A22. The
three drawings 4.400 (a, b and c) show the wings, 6.400 the flaperons,
8.400 the elevator, and 3.400 the rudder. There’s no fabric on the fuselage.