T-27 Tucano 20cc 1.2 2022
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Above: spinner/cowling parallel alignment.
In the case of gasoline and glow engines, an efficient flow of cold air is recommended for engine cooling. The
air inlet in the lower part of the cowling is sufficient for the air flow, however it is necessary to make room for
the air outlet, which must be done in the lower rear part of the cowling, taking advantage of the holes for the
engine exhaust pipes. The air outlet area must be 2 times larger than the front air inlet area. In gas burning
engines we rec
ommend the use of a “velocity stack”, which exte
nds the distance from the carburetor air intake,
causing the air to be captured inside the fuselage, through the firewall.
After making the cuts in the cowling to accommodate the engine and exhaust parts and having access to the
engine adjustment needles (gasoline or glow) be sure to apply 5 minutes epoxy glue or medium CA on the cut
parts in order to seal the surfaces. between the layers of paint and varnish so that they do not get fuel, oil and
other engine residues.
Above: inferior cowling installation with 120 4 cycle glow engine (left and center) and with DLE-20RA muffler
exhaust exits and ventilation (right).
