Dear Dimona Owners
When using my H36 for field landing training an adjustable engine cowl
would be very useful. Open up the bottom of the engine bay to allow
plenty of cooling air through at a high power setting, then close the
cowl to reduce the rate of cooling when the throttle was closed at top
of descent. This would keep the engine warmer for the go-around as the
student flew over the fence in what was hopefully a well-executed circuit.
I realise that an adjustable cowl flap would need to be a certified
modification, and I'm just checking with the group to see whether anyone
has developed and installed such a mod, and how well it worked.
On my aircraft the cooling air outlet is way smaller than the area of
the intake. The usual wisdom with air-cooled engines is that the outlet
needs to be a little larger than the inlet to allow for the air to
expand as it gains heat from the engine.
Kind regards
Martyn
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