RB211-22B L1011 engine ground run started by bleed air from two APUs. Spring gas turbine crank up 2015.

gasturbine:Remember guys this engine is running at Idle, a 747 hardly moves when sat on its wheels at idle. The induced flow in front of the engine only extends a few meters in front of it. Across the face of the air intake there is of course significant induced flow and pressure drop but at idle its unlikely to suck you in but I'm not gonna try it!

largestengines:A turbofan or fanjet is a gas turbine jet engine with a large diameter fan on the front. Although not a pure jet engine that develops 100% of its own thrust, a turbofan engine gets up to 80% of its thrust from the fan with the remaining from the jet engine.