\version "2.21.0"

#(define-public (modern-straight-flag grob)
  ((straight-flag 0.52 0.88 -18 1.1 22 1.2) grob))
  
\layout {
  \context {
    \Score
      \override Flag.stencil = #modern-straight-flag
  }
}

\relative c' {

  \autoBeamOff
  { f'8 f16 f32 f }
  \autoBeamOn
  { d8 d16 d32 d }
  
    
}