text: effective and these sections have a small 
  spanwise moment arm. Therefore, the changes 
  in wing lift due to sideslip occur closer in- 
  board and the dihedral effect is reduced. The 
  effect of power on dihedral effect is negligible 
  for the jet airplane but considerable for the 
  propeller driven airplane. The propeller slip- 
  stream at high power and low airspeed makes 
  the inboard wing sections much more effective 
  and reduces the dihedral effect. The reduction 
  in dihedral effect is most critical when the 
  flap and power effects are combined, e.g., the 
  propeller driven airplane in the power approach 
  or waveoff. 