>Which is why I am just modifying the air duct exhaust with
a temperature controlled 'cowl' flap. <
I have been down this route on 2 occasions once with a Classic cowl and
once with an XS cowl. It is normal to control the exhaust rather than
the inlet air which is what I did in both cases. Even with the outlet
for the XS cowl being fully closed it made little difference to
controlling either oil or coolant temperature. The only flap I have seen
work really successfully controls the inlet air. The design uses a flap
which can be raised to close off airflow whilst airborne or lowered on
the ground to encourage increased airflow.
Nigel Charles
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