Detonation, etc.

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Hi guys,

Just finishing the ATPLs and it's occurred to me that I've never experienced or come across Detonation or Pre-Ignition.

Do any of you learned folks know of any web-site or DVD / Video that demonstrates this? Obviously, it's not something you would want to do purposely so I wondered if anyone knows of a source of info.

The nearest I've come is inadvertently switching the Mags to 'Off' during power checks then back on quickly which resulted in a great big 'bang!' and cloud of smoke, along with a group of onlookers diving for cover. As a matter of interest, what was that?

Cheers,

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[stevef]

The 'great big bang' was the unburnt fuel in the exhaust suddenly igniting after the mags were turned back on (very hot gases through the exhaust valve). Very spectacular, I agree, especially on a large radial engine!
Anyone interested in detonation and pre-ignition will find this article useful:
http://www.douglasdc3.com/sohn/7.htm

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Thanks for the info Steve.

Much appreciated.