Loosing wingtips makes you faster
Rip off your landing gear and there is no performace loss. Loss of the entire main gears (especially fully enclosed when retracted types) should put a huge drag factor on the airframe and cause a lot of speed loss.
Also asked for several times is loss of output engine power when it is damaged (not the current instant dead engine effect). Like if the oil is hit, the engine begins to loose power gradually, rather than running at full power until the oil is gone.
