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an airframe can fly with no engines, (sailplanes, etc) but for powered aircraft alot depends on existing altitude, weight, COG loading, density altitude, how it's trimmed, and pilot skill.
true safety for passengers relates mostly to an aircraft's landing or stall speed.
while large commercial jets have the highest per mile safety rating when they do crash folks usually die, same with multi-engine general aviation planes; so more engines do not necessarily connote passenger safety unless flying over hazardous terrain or open water.
if you want to walk away from a dead stick landing best to be in something with a low stall speed, i.e. cessna.
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