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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 ]
Plug load is the energy used by products that are powered by means of an ordinary AC plug (e.g., 100, 115, or 230 V). [1] This term generally excludes building energy that is attributed to major end uses ( HVAC , lighting , water heating , etc.) [ 1 ]