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PTFE Liner NSA
Pictures.
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This is it on the ground. The
PTFE sheet (actually half a Dupont Teflon baking
sheet - recovered of course) is between the
parachute and the straight sides of the nose
cone. The hemispherical end of the nose cone
does not need to be lined as the parachute only
pulls away from it and does not slide along it.
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This shows the drogue having
pulled the nose cone away from the main chute
which still has the PTFE liner partially wrapped
around it. The enhanced inset view shows that
the liner is coming away from the end of the
chute as the rocket pulls the other end.
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This picture shows the main
chute almost open with the PTFE liner just above
it. If you are doing this for a Science
Olympiad, you should consider tying the PTFE
sheet, the nose cone and the main chute together
using appropriate lengths of cord so that you
don't exceed your length limit and it all comes
down in 'one piece'.
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Fully open, the two parachutes
with their respective loads float to earth. The
PTFE liner on the right falls significantly
slower than the other two so if you are launching
in a bit of a breeze, you may like to consider
fastening the liner to the nose cone with a short
cord so that once it has come out and allowed the
main chute to deploy, it comes down quicker.
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