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Originally Posted by 9mmCensor
Real world heavy lifters use 2 or 4 engines. Stick with that. Plus redundancy is nice. (flying on 3 or 2)
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I can agree with that, but redundancy is over-rated; engine reliability is rarely an issue. The trick is that if one has an engine failure, the aircraft becomes very difficult to handle.
How about a front-back (puller-pusher) engine arrangement?
I'm still leaning towards doubling the wingspan though, because of that weight.