Report Abuse. To get airborne, a Boeing 737 needs to reach a speed of 140 knots (its rotate speed or Vr). For landings, I usually maintain 150knots (MS-FlightSimulator). These speeds really depend on an airplane's design, weight, wing shape and size, wind/weather factors, etc.Fulani Filot Â· 9 years ago.o get airborne, a Boeing 737 needs to reach a speed of 140 knots (its rotate speed or Vr). For landings, I usually maintain 150knots (MS-FlightSimulator).
The Muscles Worked During Calf Raises. Calf raises target the muscles on the back of your lower legs. Photo Credit fatchoi/iStock/Getty Images. The calf raise exercise targets the muscles on the back of your lower legs that facilitate plantar flexion, or ankle extension. These muscles contract to lift your heels off the floor during the upward-movement phase of the exercise, and to control the speed of movement during the downward movement phase.
Your quadriceps muscles at the front of your thighs are responsible for movement at your knees, and the soleus muscles in your calves control movement in your ankles. When you stand up, these muscles contract concentrically, or shorten as they contract.eorge Doyle/Stockbyte/Getty Images. Sitting down and standing up require a coordinated effort from muscles surrounding your hip, knee and ankle joints. Joints, or articulations, are junctions between two bones that permit a degree of movement.