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  2. Pusher configuration - Wikipedia

    en.wikipedia.org/wiki/Pusher_configuration

    Prop efficiency is usually at least 2–5% less and in some cases more than 15% less than an equivalent tractor installation. [23] Full-scale wind tunnel investigation of the canard Rutan VariEze showed a propeller efficiency of 0.75 compared to 0.85 for a tractor configuration, a loss of 12%. [ 24 ]