\documentclass[12pt]{article} % voss_at_pstricks.de (2004-06-03)
\usepackage{multido}
\usepackage{pstricks}
\usepackage{pst-plot}
\usepackage{pst-stru}
\pagestyle{empty}
\parindent=0pt
\begin{document}

\psset{arrowsize=0.8mm,arrowinset=0}
\begin{pspicture}(-1,-3.5)(11,3)
%    \psgrid[subgriddiv=0,griddots=10,gridlabels=7pt,gridcolor=magenta]
    \triload[K=1,P=8,L=5]
\end{pspicture}

\end{document}