Write-up on lower stage descent
This commit is contained in:
Sampo Niskanen
parent
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commit
0725a1c16e
4
core/doc/techdoc/.gitignore
vendored
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core/doc/techdoc/.gitignore
vendored
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*.log
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*.aux
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*.dvi
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*.bak
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core/doc/techdoc/DEPENDENCIES.txt
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core/doc/techdoc/DEPENDENCIES.txt
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The following packages need to be installed on top of the basic
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texlive installation to compile the technical documentation (in Ubuntu):
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texlive-latex-extra
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texlive-math-extra
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texlive-fonts-extra
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@ -2244,15 +2244,16 @@ during descent, significantly reducing their speed.
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This kind of tumbling is difficult if not impossible to model in
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6-DOF, and the orientation is typically not of interest anyway.
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Therefore for simulating the descent of aerodynamically unstable
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stages, it is sufficient to compute the average aerodynamic drag of
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For simulating the descent of aerodynamically unstable stages, it is
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therefore sufficient to compute the average aerodynamic drag of
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the tumbling lower stage.
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While model rockets are built in very peculiar forms, staged rockets
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are typically much more conservative in their design. The lower
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stages are most often formed of just a body tube and fins. Five such
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models were constructed for testing their descent aerodynamic drag.
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The physical properties of the models are listed in Table~XX.
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The physical properties of the models are listed in
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Table~\ref{tab-lower-stages}.
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% # fins
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% root chord
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@ -2261,16 +2262,28 @@ The physical properties of the models are listed in Table~XX.
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% diameter
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% mass
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\begin{table}
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\label{tab-lower-stages}
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\caption{Physical properties of the lower stage models}
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\begin{center}
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\parbox{85mm}{
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\begin{tabular}{cccccc}
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Model: & #1 & #2 & #3 & #4 & #5 \\
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fins & 3 & 3 & 4 & 0 & 3 \\
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$C_r$ & & & & - & \\
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$C_t$ & & & & - & \\
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$s$ & & & & - & \\
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$d$ & & & & & \\
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$m$ & & & & & \\
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Model & \#1 & \#2 & \#3 & \#4 & \#5 \\
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\hline
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No. fins & 3 & 3 & 4 & 0 & 3 \\
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$C_r$ / mm & 50 & 70 & 70 & - & 200 \\
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$C_t$ / mm & 25 & 40 & 40 & - & 140 \\
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$s$ / mm & 50 & 60 & 60 & - & 130 \\
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$l_0$ / mm & 10 & 10 & 10 & - & 25 \\
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$d$ / mm & 18 & 44 & 44 & 44 & 103 \\
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$l$ / mm & 74 & 108 & 108 & 100 & 290 \\
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$m$ / g & 8.1 & 18.0& 21.8& 6.8 & \\
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\hline
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\end{tabular}
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}
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\parbox{50mm}{
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\epsfig{file=figures/lower-stage/lower-stage,width=50mm}
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}
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\end{center}
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\end{table}
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The drop tests were performed from a height of XX meters and the drop
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core/doc/techdoc/figures/lower-stage/lower-stage.eps
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%!PS-Adobe-3.0 EPSF-3.0
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%%Title: lower-stage.fig
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Reference in New Issue
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