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.
Standing Phase: Muscle Activation. Muscles activated in the standing phase of the squat are the same muscles that are used in the lowering phase. However, during the standing phase of the squat, these muscles shorten as they contract, producing a concentric contraction.s you lower into a squat, these muscles contract as they lengthen to control your speed. The knee extensors -- rectus femoris, vastus medialis, vastus intermedius and vastus lateralis -- contract as they lengthen to control your knees as they bend.