Good question Perry.
Answer would depend on the exact nature of the 'open' .
Open at ground end, hot end, or wiper. Answers in order:
mixture goes full rich, full lean, wanders around at last set point. The
pot used is a high rel part rated for 500,000 cycles but of course anything
can fail.
Most pot failures are 'dead spots' where the wiper goes open at a
certain spot (usually near where it is used the most). Mixture will
drift at this point and proper pilot response would be to move mixture to
a slightly richer setting, land, get the pot replaced before flying
again. Thanks for the mental nudge, I need to add this to the
instruction manual.
I have pondered various fail safe strategies for this
scenario (for example, make the B controller fixed at midrange mixture) but so
far have not been satisfied with any of them. Anyone have other ideas to
be considered?
Tracy
----- Original Message -----
Sent: Thursday, December 22, 2005 4:50
PM
Subject: [FlyRotary] Question for Tracy
- was: Off Topic "Switch Placements"
This reminds me to ask a question to Tracy that wanders
through my brain
when there is no civilization in sight out the cockpit
windows.
Tracy: If the mixture pot fails (not all that uncommon to
get an open
failure in potentiometers) what does the EC2 firmware do to
the mixture?
Perry Casson
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