On 07/16/2012 07:09 AM, Roland wrote:
> Do I get something wrong here or is it a design fault of the Rotax?
I'm afraid you did something wrong...
You are not supposed to take off when the warning lights do not come on.
Furthermore you are supposed to watch the manifold pressure gauge when
you select T/O power.
Note that what you experienced was the worst scenario: Apparently the
last known state of the engine was at low power or switched off and thus
with the waste gate fully closed, and you applied full power without the
TCU available to open the waste gate, with an extreme overboost as a result.
During flight nothing dramatic will happen when the TCU suddenly fails,
as the waste gate will stay on its most recent setting, which is correct
for your selected power and atmospheric pressure. Depending on the
throttle setting and altitude you will either experience some loss of
power or a mild overboost when changing the throttle setting or changing
altitude. It should get you home safely.
Sorry to hear your misfortune...
Frans
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