water rockets - nirarocketry.orgnirarocketry.org/docs/waterrocketpresentationscottmueller.pdf ·...
TRANSCRIPT
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Water Rockets
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Containment Vessels● 2L pop bottle (or
similar)● FTC Tube
(fluorescent tube cover)
● Fiberglass HPR airframes
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FTC Construction MethodCreating a Mandrel
● Shrink the nozzle of a pop bottle over a mandrel to fit the ID or OD of an FTC
● Use 1/2” Sch40 PVC to center the nozzle
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FTC Construction MethodMandrel #2
http://www.waterrocketpop.com/ftc_assembly1.htm
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Creating a Mandrel- Casting● Plaster of Paris
http://cullytechnologies.com/demo/h2orockets/ftc_mould.php
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PVC Mandrel● 3/4” coupler + 3/4” to
1/2” PVC reducer
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Gluing the Endcap into the FTC● Glue: PLP Premium
Construction Adhesive
● Install both endcaps at once and use a piece of 1/2” PVC to center them.
http://www.waterrocketpop.com/images/ftc/CustomMold17.JPG
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Finished FTC Endcap● Pop Bottle Nozzle
Shrunk and glued onto OD of FTC
● Glue is PLP Premium Construction Adhesive
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Spliced Water Rockets● Connect Two or more
bottles end to end
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Splicing Pop Bottles● Cut two bottles in half
and butt join them● Reinforce with sleeve
from a third bottle
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Launch Rod O-ring Groove ● O-ring seals the
nozzle against the launch rod
Bottle on Launcher Cross Section
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Clark Cable “Cable Tie” Launcher● Cable Tie Head
secures the lip of the pop bottle
● Cable Ties restrained by a moveable collar
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Clark Gable “Cable Tie” Launcher
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Garden Hose Quick Release Launcher
http://users.skynet.be/willaert/WR/gardena/gardena.htm
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U Pin Launcher
http://users.skynet.be/willaert/WR/launcher_2.htm
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Tee Nozzle● Tee nozzle slides
down into pop bottle endcap and reduces effective nozzle diameter
● Increased Impulse
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Tee Nozzle
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Recovery Methods
● Backslidingsimple, works well on long FTC rockets
● Parachuteuse Tomy Timer air speed flap release mechanism
● Electronic altimeter + deployment mechanism
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Two Stage Mechanisms● Crushing Sleeve
Mechanism● Electromechanical
Staging● Katz Stager
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Crushing Sleeve● See link for details
including parts labels
http://grosse.is-a-geek.com/paul/wrhelp44/2stsc.html
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Katz Stager
http://www.aircommandrockets.com/day51.htm
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Simulators● Clifford Heath
Simulator● Dean's Benchtop
Simulator● Seeds Simulator
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Water Rocket References● Water Rocket Association