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To: Haim R. Branisteanu who wrote (148100)	4/28/2019 5:20:04 PM
From: Elroy Jetson	3 Recommendations Recommended By elmatador Haim R. Branisteanu SirWalterRalegh Respond to of 219648

We've had turbofan engines for decades. The more recent development you're referring to are "high bypass" turbofan engines which uses the heat of combustion to expand the air which bypasses the engine thereby increasing thrust with the otherwise lost heat ejected past the jet vanes. There's another huge jet engine development which is about to be scaled up to large commercial jet engines - a planetary reduction gearbox which will reduce fuel consumption by 25% and reduce engine noise with a Geared Turbofan. . The turbofan is on the same spindle as the vanes driven by the combustion cans, so they both spin at the same speed. This is far too slow for the jet vanes to be efficient and far too fast for the turbofan in front, whose much larger outer diameter is already traveling faster than the speed of sound. There's some energy loss is a gearbox, but this is offset by the greater thrust and lower drag from the turbofan. - en.wikipedia.org . Fighter jets have more thrust that's true, but they're designed to be inherently aerodynamically unstable, which means they can immediately maneuver sharply in any direction. A nightmare for an inexperienced pilot. The newest fighters cannot by flown without the assistance of a computer to help keep the aircraft stable. Fighter pilots make the best commercial pilots because they're very experienced at handling maneuvers commercial pilots are not trained to fly. If an Airbus system fails over to Alternate Flight Law, most pilots will barely be able to control the aircraft, but for a former fighter pilot, they probably feel alive again. Former fighter pilots like my late uncle would smile and shake their read something like how the Ethiopian pilot couldn't cope with a simple flight envelope control like MCAS, even when acting inappropriately due to a failed sensor. How is it that this person is flying a commercial aircraft???

To: Haim R. Branisteanu who wrote (148100)	4/28/2019 5:36:44 PM
From: Elroy Jetson	1 Recommendation Recommended By elmatador Read Replies (1) \| Respond to of 219648

I wonder how such gross mistakes can happen? Pilots are trained to follow Crew Resource Management en.wikipedia.org In spite of this training, CRM is usually the first thing to go wrong prior to an air fatality. People under stress drop CRM and communicate poorly, or stop communicating, and they assess facts incorrectly they could probably solve with the assistance of others. Simulator training is used to train pilots to use CRM in a variety of stressful situations. Bonin pulled back on the side-stick without telling his co-pilot what he was doing. Completely wrong. I've posted these previously, but this is what Crew Resource Management is supposed to look like. One person flies and the other communicates and reads checklists, and each event an alert is supposed to be cross-checked by both pilots. If this doesn't appeal to you, you have no business being a pilot. Good pilots find this fun every time they do it.