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Write-up on lower stage descent

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Sampo Niskanen 2013-01-23 08:24:53 +02:00
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core/doc/techdoc/.gitignore vendored Normal file
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*.log
*.aux
*.dvi
*.bak

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The following packages need to be installed on top of the basic
texlive installation to compile the technical documentation (in Ubuntu):
texlive-latex-extra
texlive-math-extra
texlive-fonts-extra

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core/doc/techdoc/chapter-aerodynamic-properties.tex
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@ -2244,15 +2244,16 @@ during descent, significantly reducing their speed.
This kind of tumbling is difficult if not impossible to model in This kind of tumbling is difficult if not impossible to model in
6-DOF, and the orientation is typically not of interest anyway. 6-DOF, and the orientation is typically not of interest anyway.
Therefore for simulating the descent of aerodynamically unstable For simulating the descent of aerodynamically unstable stages, it is
stages, it is sufficient to compute the average aerodynamic drag of therefore sufficient to compute the average aerodynamic drag of
the tumbling lower stage. the tumbling lower stage.
While model rockets are built in very peculiar forms, staged rockets While model rockets are built in very peculiar forms, staged rockets
are typically much more conservative in their design. The lower are typically much more conservative in their design. The lower
stages are most often formed of just a body tube and fins. Five such stages are most often formed of just a body tube and fins. Five such
models were constructed for testing their descent aerodynamic drag. models were constructed for testing their descent aerodynamic drag.
The physical properties of the models are listed in Table~XX. The physical properties of the models are listed in
Table~\ref{tab-lower-stages}.
% # fins % # fins
% root chord % root chord
@ -2261,16 +2262,28 @@ The physical properties of the models are listed in Table~XX.
% diameter % diameter
% mass % mass
\begin{table} \begin{table}
\label{tab-lower-stages}
\caption{Physical properties of the lower stage models} \caption{Physical properties of the lower stage models}
\begin{center}
\parbox{85mm}{
\begin{tabular}{cccccc} \begin{tabular}{cccccc}
Model: & #1 & #2 & #3 & #4 & #5 \\ Model & \#1 & \#2 & \#3 & \#4 & \#5 \\
fins & 3 & 3 & 4 & 0 & 3 \\ \hline
$C_r$ & & & & - & \\ No. fins & 3 & 3 & 4 & 0 & 3 \\
$C_t$ & & & & - & \\ $C_r$ / mm & 50 & 70 & 70 & - & 200 \\
$s$ & & & & - & \\ $C_t$ / mm & 25 & 40 & 40 & - & 140 \\
$d$ & & & & & \\ $s$ / mm & 50 & 60 & 60 & - & 130 \\
$m$ & & & & & \\ $l_0$ / mm & 10 & 10 & 10 & - & 25 \\
$d$ / mm & 18 & 44 & 44 & 44 & 103 \\
$l$ / mm & 74 & 108 & 108 & 100 & 290 \\
$m$ / g & 8.1 & 18.0& 21.8& 6.8 & \\
\hline
\end{tabular} \end{tabular}
}
\parbox{50mm}{
\epsfig{file=figures/lower-stage/lower-stage,width=50mm}
}
\end{center}
\end{table} \end{table}
The drop tests were performed from a height of XX meters and the drop The drop tests were performed from a height of XX meters and the drop

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