Remember the tip speeds of the fan blades and think about the impact of a near stationary object. Also think about the mechanical strength of the blades when subject to this impact which is generally well outside the design working stresses on the blade but is catered for to pass certification.
Over the years I've seen some quite small birds do some rather big damage to a few engines.
Last edited by mustafagander; 6th Jul 2017 at 10:39.
Reason: Can't spell