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Cold start on for the full lean condition is a good idea. Punching the program button in mode 0 (Primer function) will not work because the EC2 disables the primer when it senses that the engine is running.

For full rich, Turning a set of injectors off would be good except that it doubles the injection on the others at the same time. (I sense a suggestion on the way for yet another switch to disable the injector doubling function : )

Another thing to do in an emergency would be to cycle the fuel pump on & off to lower the fuel pressure in order to lean the mixture. Or, install a fuel pump controller to drop the pressure like some late model cars do. (No! Just kidding!! even though it would work)

Tracy

Thanks for the info, Tracy. Until a decision is make on alternatives, what might be good courses of action (in order to get to a place to safely land)??

Full rich. Turn the secondary injectors off - intermittently turn them all off if bogging.

Full Lean. Intermittently turn on cold start or repeatedly punch program button in 0 mode

Wander around. Figure that on average it will be "just" right {:>).

Ed A

----- Original Message -----

From: Tracy Crook

To: Rotary motors in aircraft

Sent: Friday, December 23, 2005 11:02 AM

Subject: [FlyRotary] Re: Question for Tracy - was: Off Topic "Switch Placements"

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 -----

From: Perry Casson

To: Rotary motors in aircraft

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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