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On 06/04/2014 12:24 PM, GTH wrote:
> Concerning the coolant thermostat option, the question is, do you
> value lightness, simplicity and low drag or not ? A thermostat
> helps oil *warming*, not cooling, at the price of additionnal
> weight and constant cooling drag penalty.
I was waiting for someone to bring this up. ;-)
It is *much* better to create a cowl flap at the air exit to regulate
the amount of cooling air through the system.
1) It lowers drag, and thus gives you either less fuel consumption,
extended range, or higher speed.
2) It is easier and safer. With the well known trim servo it is easy
to set up a flap in the air exit that can be retracted against the air
flow. If it breaks, the air flow will push the flap open.
Cooling thermostats come with extra hose connections, and are not
without issues themselves.
I have such a system and it works perfect. With a trim alike button I
can modulate the cowl flap and see an almost immediate response on the
water temp gauge.
I can do something that a coolant thermostat not can do: anticipate.
Before commencing a long descents (or before starting to climb) I can
adjust the cowl flap. Give some extra cooling before starting a
prolonged climb, or let the engine heat up a bit more before pulling
the power for a long descent.
Frans
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