\documentclass{article}
\usepackage[paperheight=11cm,paperwidth=11cm]{geometry}
\usepackage{tikz}
\usetikzlibrary{arrows}

\pagestyle{empty}


\begin{document}
\def\ra{-38.1076}  \def\sa{16.6992}
\begin{tikzpicture}[scale=1.2]
  \draw[very thick] (0,0)coordinate(O) circle(2cm);
  \begin{scope}[rotate=\ra]
    \draw[thick] (-2.5,3.1875) parabola bend (-1,2.85)  (1,3.45);  % 3 + x⋅3/10 + x²⋅(3/20)
    \draw (O) -- (0,2) coordinate (EG) -- (0,3) coordinate(E) 
      node[pos=0.5,above]{$\scriptstyle h$};
    \draw[dashed] (E) -- ++(1.2,0);
    \draw[-triangle 45] (E) +(\sa:-1cm) -- ++(\sa:1.5cm) node [above]{$\scriptstyle v$};
    \path (E) ++(0.75,0.1)node{$\scriptstyle\gamma$};
    \draw[<->] (E) ++(0.9,0) arc[start angle=0, end angle=\sa, radius=0.9];
    \draw (E) ++(0.2,0) arc[start angle=0, end angle=-90, radius=0.2];
    \fill (E) ++(-45:0.12cm) circle(0.2mm);
    \foreach \point in {EG,E} \fill (\point) circle(.5mm);
  \end{scope}
  \draw[-triangle 45] (O) -- ++(0,2) coordinate (SG) node[pos=0.5,left]{$R$};
  \draw (SG) -- ++(0,2.05095)coordinate(S);
  \draw[<->] (SG) ++(0,0.3) arc[delta angle=\ra,start angle=90,radius=2.3]
    node[pos=0.5,fill=white]{$\scriptstyle\xi$};
  \foreach \point in {O,S,SG} \fill (\point) circle(.5mm);
\end{tikzpicture}
\end{document}
