Indeed yes the weight of all of this Aircraft hybrid drive has to be equal to or less than the original engine/fuel weight. I think this can be achieved given the much lower need for fuel. No need for a reduction drive with the right EMRAX motor. The real weight would be in the batteries, GM 1.6 Turbo Diesel, Generator/Drive Motors. Also true that a plane that can land slow and take off quick has an advantage, better yet if it also has a good/great top speed.
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