Oleg, SOW engine abuse by pilot?

[dduff442]

Alfa Romeo have often employed dual ignition since the 60s for a leaner burn and higher power. Igniting the mixture at two different points caused a quicker burn and allowed tighter timings.

Don't know anything about this regarding fighter a/c, though. Presumably if dual ignition was used to tighten timings, knock would become a serious issue if one circuit was knocked out. OTOH, a dual system would provide redundancy but only a tiny increase in power if the ignition timing was the same as a single-ignition setup.

dduff

[Blackdog_kt]

Thanks for the clarifications sternjaeger. It makes more sense now and yes, i agree that for an engine to be considered safely off the pilot needs to also switch off the ignition and not just the fuel supply

[Crumpp]

The KG is not driven by the battery or the generator, It is mechanical in the BMW801 series and hydraulic in the Jumo 213 series. It uses the mags and is not affected by a loss of systems electrical power to advance the timing.

The VDM propeller only uses electrical power for emergency operation which the KG does not control. In normal operation it is a hydraulic governor and is a normal CSP.

[Azimech]

Very interesting!

Would you happen to have some documentation on that device? I'd love to study it's details!