Originally Posted by
albatross
2 engines at idle produce more thrust than 1 engine at idle.
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Huh?? No mate. Piston props produce more drag than thrust at idle, so net drag. That's why they descend like a brick when you close the throttles. Jet's still produce forward thrust at idle (about 4-5% ish of maximum) so they need a shallower descent and need a lot of runway if you are not on Vref. It was a long time ago but i remember powering light twin all the way down to just above the ground; But bizjets (Challenger) you need to start creeping the thrust back at 30-50ft.