deletions | additions       diff --git a/Chapters/8e.LandingGear.tex b/Chapters/8e.LandingGear.tex  new file mode 100644  index 0000000..a5d00e2  --- /dev/null  +++ b/Chapters/8e.LandingGear.tex 
...
\section{Landing Gear}  \label{sec:trade_LG}  %Please do not forget to add new symbols to the nomenclature e.g.: \nomenclature{$t_{element}$}{Thickness coefficient of plate \nomunit{[$-$]}}  For the landing gear there are 2 choices to be made for the conceptual design.  The first one is the choice between a tricycle and a tail-dragger will depend on the location of the propeller because the clearance of the propeller is of great importance. A puller propeller will be combined with a tail-dragger and a pusher propeller with a tricycle. The other choice is whether to design the landing gear to be retractable or fixed.  \subsection{Trade-Off Criteria and Weights}  For this trade-off three criteria were used:  \begin{itemize}  \item \textbf{Weight}: The weight of the landing gear is and important parameter because the complete aircraft has to be as light as possible.  \item \textbf{Drag}: The aerodynamic characteristics of the landing gear are also important. Because the landing gear will not produce any lift, the drag is a good indication for the aerodynamic behavior.   \item \textbf{Complexity}: The complexity of the design can be expressed as the number of individual parts that are needed for a design. A design where more parts are needed will be more difficult to design and produce.  \end{itemize}  There are no exact numbers known at this point, therefore both options will be compared qualitatively for all the configurations.  The weights were obtained using a pairwise comparison of the three criteria and can be seen in Table~\ref{tab:LG_weights}  \begin{table}[htbp]  \centering  \caption{Weights for the criteria of the landing gear trade-off}  \label{tab:LG_weights}  \begin{tabular}{l c}  \toprule  \textbf{Criterion} & \textbf{Weight}\\  \toprule  Weight & 0.3750\\  Drag & 0.3750\\  Complexity & 0.2500\\  \bottomrule  \end{tabular}  \end{table}  \subsection{Trade-Off Landing Gear}  The trade-off was performed and the outcome is presented in Table~\ref{tab:trade_LG}. The fixed landing gear turned out to be the best choice for our design.  \begin{table}[htbp]  \centering  \caption{Trade-off results for the landing gear}  \label{tab:trade_LG}  \begin{tabular}{l c c}  \toprule  \textbf{Design Option}& \textbf{Ranking} & \textbf{Weight}\\  \toprule  \rowcolor{grey}  Fixed landing gear & 1 & 0.5729\\  Retractable landing gear & 2 & 0.4271\\  \bottomrule  \end{tabular}  \end{table}  One consideration to be made is that the fixed landing gear will cause an increase of drag. However, according to the current RBAR regulations~\cite{committee2010} all the competing aircraft are required to have a fixed landing gear. Therefore the drag increase should not be a cause for performing worse than the current competitors.