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00:00:02,068 --> 00:00:05,068
--Captions by VITAC--
www.vitac.com
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00:00:05,068 --> 00:00:08,000
CAPTIONS PAID FOR BY
DISCOVERY COMMUNICATIONS
3
00:00:53,068 --> 00:00:56,551
Narrator:
THE INDY STEERING WHEEL
ISN'T JUST FOR STEERING.
4
00:00:56,551 --> 00:00:58,965
IT'S THE CONTROL CENTER
FOR THE RACECAR,
5
00:00:58,965 --> 00:01:00,517
REPLACING THE DASHBOARD.
6
00:01:00,517 --> 00:01:03,620
THIS INCREDIBLE STEERING WHEEL
IS ALSO DETACHABLE
7
00:01:03,620 --> 00:01:06,655
TO ALLOW THE DRIVER
TO ENTER AND EXIT THE COCKPIT
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00:01:06,655 --> 00:01:08,206
QUICKLY AND EASILY.
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00:01:08,206 --> 00:01:11,241
IT'S, QUITE SIMPLY,
DESIGNED FOR SPEED.
10
00:01:15,103 --> 00:01:18,482
THE INDY STEERING WHEEL IS
A COMPLEX PIECE OF EQUIPMENT
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00:01:18,482 --> 00:01:21,517
THAT PUTS EVERYTHING
AT THE DRIVER'S FINGERTIPS.
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00:01:21,517 --> 00:01:23,965
IT STARTS
WITH A FULL-SCALE DESIGN,
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00:01:23,965 --> 00:01:28,379
CUSTOMIZED TO THE DRIVER'S
RACING STYLE AND PREFERENCES.
14
00:01:28,379 --> 00:01:30,137
THE TECHNICIAN ALIGNS
15
00:01:30,137 --> 00:01:32,793
THE TRADITIONAL RACING
STEERING WHEEL WITH THE DRAWING,
16
00:01:32,793 --> 00:01:36,241
AND MARKS IT
FOR A COMPLETE REMODEL.
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00:01:36,241 --> 00:01:39,758
HE CUTS OUT
THE LEATHER AND FOAM WRAP
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00:01:39,758 --> 00:01:41,965
WITHIN THE MARKED LINES
19
00:01:41,965 --> 00:01:45,103
AND SAWS OFF A CHUNK
OF THE ALUMINUM FRAME.
20
00:01:49,862 --> 00:01:52,379
HE THEN ACTIVATES
A COMPUTERIZED CUTTER
21
00:01:52,379 --> 00:01:55,758
THAT CARVES AWAY A BIG SECTION
OF THE STEERING WHEEL HUB.
22
00:01:55,758 --> 00:01:59,000
IT ALSO CUTS HOLES FOR SWITCHES.
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00:01:59,000 --> 00:02:01,137
WITH THESE CHANGES,
24
00:02:01,137 --> 00:02:04,379
THE STEERING WHEEL IS READY
TO ACCOMMODATE A PANEL
25
00:02:04,379 --> 00:02:07,241
WITH OVER TWO DOZEN CONTROLS
AND GAUGES.
26
00:02:07,241 --> 00:02:10,275
NEXT, MORE COMPUTERIZED TOOLING
27
00:02:10,275 --> 00:02:13,931
TRANSFORMS A SHEET
OF CARBON FIBER
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00:02:13,931 --> 00:02:16,827
INTO THE STEERING WHEEL'S
SWITCH PLATE.
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00:02:16,827 --> 00:02:21,413
IT CUTS OUT HOLES
FOR SCREWS AND SWITCHES,
30
00:02:21,413 --> 00:02:25,689
AND IT CREATES SLOTS
FOR THE SHIFT AND CLUTCH PANELS.
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00:02:25,689 --> 00:02:28,724
THE TOOL THEN ZIGZAGS
AROUND THE PERIMETER
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00:02:28,724 --> 00:02:32,758
TO TRIM THE SWITCH PLATE TO FIT
THE MODIFIED STEERING WHEEL.
33
00:02:38,206 --> 00:02:39,965
WITH THE TRIMMINGS REMOVED,
34
00:02:39,965 --> 00:02:43,068
THE SWITCH PLATE IS READY
FOR THE WORKING PARTS.
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00:02:43,068 --> 00:02:46,103
THE NEXT TECHNICIAN PLUGS
THE COLOR-CODED SWITCHES
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00:02:46,103 --> 00:02:48,551
INTO THE HOLES
AND LOCKS THEM IN PLACE
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00:02:48,551 --> 00:02:52,275
WITH NUTS
AND ANTI-VIBRATION WASHERS.
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00:02:52,275 --> 00:02:55,000
THE YELLOW ONE
IS A PIT-LANE SPEED LIMITER.
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00:02:55,000 --> 00:02:56,896
AS THE NAME SUGGESTS,
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00:02:56,896 --> 00:03:00,896
IT WILL LIMIT THE CAR'S SPEED
IN THE PIT LANE.
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00:03:00,896 --> 00:03:02,793
ONCE ALL THE SWITCHES
HAVE BEEN INSTALLED,
42
00:03:02,793 --> 00:03:07,137
HE RUNS WIRES TO THEM
AND SOLDERS THE CONNECTIONS.
43
00:03:07,137 --> 00:03:09,448
THIS COMPLETES THE CIRCUITRY.
44
00:03:12,379 --> 00:03:15,551
HE COATS EACH CONNECTION
WITH SILICONE SEALANT.
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00:03:15,551 --> 00:03:19,206
THIS WEATHER-PROOFS THEM
AND FURTHER DAMPENS VIBRATIONS.
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00:03:19,206 --> 00:03:21,241
AND FOR ADDITIONAL PROTECTION,
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HE APPLIES GLUE TO THE PLASTIC
SHEATHING AROUND THE WIRES.
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00:03:24,413 --> 00:03:27,793
HE ADDS A RUBBER BOOT
TO EACH CONNECTION.
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00:03:27,793 --> 00:03:30,620
THE BOOT FITS LOOSELY
AROUND IT AT FIRST,
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00:03:30,620 --> 00:03:32,172
BUT, USING A HEAT GUN,
51
00:03:32,172 --> 00:03:35,068
HE SHRINKS
THE SPECIALLY FORMULATED RUBBER
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00:03:35,068 --> 00:03:36,379
TO THE CONNECTION.
53
00:03:36,379 --> 00:03:40,517
THIS MAKES THE BOOT FIT
LIKE IT WAS MADE FOR IT.
54
00:03:43,586 --> 00:03:45,931
THE INDY-STEERING-WHEEL
SWITCH PLATE
55
00:03:45,931 --> 00:03:47,689
IS NOW READY
FOR THE SHIFT PADDLES.
56
00:03:47,689 --> 00:03:52,344
SO NEXT, THE TECHNICIAN SCREWS
A SPACER PLATE INTO THE SLOT.
57
00:03:52,344 --> 00:03:55,758
THIS METAL SPACER SLIGHTLY
ELEVATES THE PADDLE MECHANISM
58
00:03:55,758 --> 00:03:58,379
TO GIVE IT THE RIGHT AMOUNT
OF CLEARANCE.
59
00:03:58,379 --> 00:04:04,034
HE SCREWS THE PADDLE ASSEMBLY
TO THE SPACER.
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00:04:04,034 --> 00:04:07,827
HE INSTALLS THE SECOND SHIFT
PADDLE AND TWO CLUTCH PADDLES.
61
00:04:07,827 --> 00:04:11,655
THEN HE INSERTS THE ROTARY
SWITCH FOR FUEL MAPPING
62
00:04:11,655 --> 00:04:14,586
AND SECURES IT
WITH A WASHER AND NUT.
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00:04:14,586 --> 00:04:18,620
THIS FUEL-MAPPING SYSTEM
WILL ADJUST THE FUEL-AIR MIX
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00:04:18,620 --> 00:04:21,379
TO BOOST OR DECREASE
POWER OUTPUT.
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00:04:23,551 --> 00:04:27,965
HE ADDS LITTLE DECALS WITH ICONS
TO THE COLOR-CODED SWITCHES.
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00:04:31,689 --> 00:04:35,758
A RADIO-TRANSMISSION ICON MARKS
THE COMMUNICATION SWITCH.
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00:04:39,482 --> 00:04:42,137
HE RETURNS
TO THE STEERING WHEEL NOW.
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00:04:42,137 --> 00:04:44,758
HE ATTACHES A UNIT
THAT DISPLAYS RPM
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00:04:44,758 --> 00:04:47,965
AND OTHER INFORMATION
THAT A NORMAL DASH WOULD HAVE.
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00:04:47,965 --> 00:04:54,689
HE SCREWS IT
TO THE EXPOSED ALUMINUM FRAME.
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00:04:54,689 --> 00:04:58,379
HE'S NOW READY TO MOUNT
THE COMPLETED SWITCH PLATE
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00:04:58,379 --> 00:05:00,931
TO THE STEERING WHEEL.
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00:05:03,793 --> 00:05:07,068
THREE BOLTS TO THE HUB
SECURE THE ASSEMBLY.
74
00:05:09,172 --> 00:05:11,896
HE INSTALLS
A SPRING-LOADED MECHANISM
75
00:05:11,896 --> 00:05:13,793
AT THE BACK
OF THE STEERING WHEEL
76
00:05:13,793 --> 00:05:15,724
THAT WILL ALLOW
THE STEERING WHEEL
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00:05:15,724 --> 00:05:18,034
TO BE INSTALLED OR REMOVED
IN HALF A SECOND.
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00:05:21,620 --> 00:05:24,896
HE TESTS THE TWO SHIFT PADDLES
AND THE TWO CLUTCH PADDLES
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00:05:24,896 --> 00:05:27,000
AND CONFIRMS
THEY OPERATE SMOOTHLY.
80
00:05:31,689 --> 00:05:33,620
FINALLY,
HE ATTACHED DENSE PADDING
81
00:05:33,620 --> 00:05:34,965
TO THE STEERING-WHEEL HUB
82
00:05:34,965 --> 00:05:37,862
FOR A SOFT LANDING
FOR THE DRIVER'S HEAD
83
00:05:37,862 --> 00:05:39,551
IN THE EVEN OF A CRASH.
84
00:05:39,551 --> 00:05:44,172
THIS INDY STEERING WHEEL COSTS
AS MUCH AS A SMALL COMPACT CAR.
85
00:05:44,172 --> 00:05:46,310
BUT FOR THE DRIVER AND CREW,
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00:05:46,310 --> 00:05:50,275
IT'S WORTH THE INVESTMENT
IF IT HELPS WIN THE PRIZE.
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Narrator: PEOPLE HAVE BEEN
DINING ON EDIBLE GREENS
88
00:06:04,103 --> 00:06:05,172
FOR THOUSANDS OF YEARS.
89
00:06:05,172 --> 00:06:07,344
TRADITIONALLY COLLECTED
IN THE WILD,
90
00:06:07,344 --> 00:06:09,793
TODAY, THERE'S NO NEED
TO FORAGE FOR THEM
91
00:06:09,793 --> 00:06:12,586
BECAUSE FIELD GREENS
ARE CULTIVATED COMMERCIALLY.
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00:06:12,586 --> 00:06:15,103
THEY'RE MIXED, WASHED,
AND PACKAGED
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00:06:15,103 --> 00:06:17,206
FOR THE CONSUMER'S CONVENIENCE.
94
00:06:17,206 --> 00:06:19,758
IT'S AN EASY DISH
TO TOSS TOGETHER.
95
00:06:23,206 --> 00:06:26,758
PACKAGED MIXED GREENS COMBINE
MILD-TASTING LEAVES
96
00:06:26,758 --> 00:06:28,724
WITH STRONGER-TASTING ONES
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00:06:28,724 --> 00:06:31,275
AND CRUNCHY GREENS
WITH MORE TENDER ONES.
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00:06:31,275 --> 00:06:33,724
SO WHEN IT COMES
TO TEXTURE AND FLAVOR,
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00:06:33,724 --> 00:06:36,137
IT'S TRULY A MIXED BAG.
100
00:06:36,137 --> 00:06:39,758
THEY CULTIVATE UP TO 20
DIFFERENT KINDS OF GREENS
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00:06:39,758 --> 00:06:43,517
ON THIS CALIFORNIA FARM,
AND THEY AREN'T ALL GREEN.
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00:06:43,517 --> 00:06:46,448
SOME ARE RED.
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00:06:46,448 --> 00:06:48,310
THEY PLANT THE VARIOUS LETTUCES
104
00:06:48,310 --> 00:06:51,551
ACCORDING TO THE RECIPES
FOR DIFFERENT PACKAGED SALADS
105
00:06:51,551 --> 00:06:55,896
SO THEY'LL HAVE
JUST THE RIGHT COMBINATION.
106
00:06:55,896 --> 00:06:59,034
WITH REGULAR IRRIGATION
AND FERTILIZATION,
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00:06:59,034 --> 00:07:00,620
THE LEAVES FLOURISH.
108
00:07:00,620 --> 00:07:02,689
IT MAKES FOR A STUNNING
RED-AND-GREEN DISPLAY
109
00:07:02,689 --> 00:07:03,827
IN THE FIELD.
110
00:07:03,827 --> 00:07:07,620
AFTER 30 TO 45 DAYS,
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00:07:07,620 --> 00:07:11,000
THESE BABY GREENS
ARE READY FOR HARVEST.
112
00:07:11,000 --> 00:07:14,965
A MACHINE WITH A LONG BLADE
MOVES ACROSS THE FIELD
113
00:07:14,965 --> 00:07:17,931
AND LITERALLY MOWS
THE FIELD GREENS.
114
00:07:20,655 --> 00:07:24,379
THE GREENS FLOW
ONTO ONE CONVEYOR
115
00:07:24,379 --> 00:07:26,344
AND TRANSFER TO ANOTHER.
116
00:07:28,689 --> 00:07:30,586
THE BELT IS A METAL-MESH ONE
117
00:07:30,586 --> 00:07:34,034
TO SIFT OUT CONTAMINANTS
LIKE SMALL ROCKS AND TWIGS.
118
00:07:34,034 --> 00:07:37,724
AT THE END
OF THE SIFTING CONVEYOR,
119
00:07:37,724 --> 00:07:40,931
THE SALAD GREENS FLY OFF
AND ONTO ANOTHER BELT.
120
00:07:40,931 --> 00:07:45,137
THIS BELT SERVES THEM UP TO BINS
ON A FLATBED TRAILER,
121
00:07:45,137 --> 00:07:48,482
CREATING AN ENORMOUS SALAD
IN EACH ONE.
122
00:07:53,000 --> 00:07:55,689
WORKERS COVER THE BINS
WITH PLASTIC
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00:07:55,689 --> 00:07:58,862
AND HAUL THEM
TO A NEARBY PROCESSING PLANT.
124
00:07:58,862 --> 00:08:02,724
ON ARRIVAL,
THE SALAD GREENS TRANSFER
125
00:08:02,724 --> 00:08:05,724
TO A VACUUM-COOLING CHAMBER
TO CHILL.
126
00:08:05,724 --> 00:08:09,172
THE VACUUM CAUSES MOISTURE
ON THE GREENS TO EVAPORATE.
127
00:08:09,172 --> 00:08:10,758
AS THE WATER EVAPORATES,
128
00:08:10,758 --> 00:08:13,448
IT ABSORBS HEAT
TO LOWER THE TEMPERATURE
129
00:08:13,448 --> 00:08:14,827
AND COOL THE GREENS.
130
00:08:14,827 --> 00:08:19,827
THE SALAD GREENS THEN HEAD
INTO AN OPTICAL SORTER.
131
00:08:19,827 --> 00:08:23,000
HERE,
COMPUTERIZED CAMERAS AND LASERS
132
00:08:23,000 --> 00:08:25,034
SCAN THE GREENS FOR FLAWS,
133
00:08:25,034 --> 00:08:28,172
LIKE DISCOLORATION
AND FOREIGN MATERIAL.
134
00:08:28,172 --> 00:08:31,068
THE OPERATOR HAS PROGRAMMED
THE SYSTEM
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00:08:31,068 --> 00:08:33,344
TO DETECT FLAWS OR CONTAMINANTS.
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00:08:33,344 --> 00:08:35,206
WHEN THE COMPUTER FINDS ONE,
137
00:08:35,206 --> 00:08:39,655
IT SENDS A SIGNAL TO AN AIR JET
THAT EXPELS IT.
138
00:08:39,655 --> 00:08:44,827
SOME GOOD LEAVES GET LOST
ALONG THE WAY -- ABOUT 3%.
139
00:08:44,827 --> 00:08:47,482
IT'S CONSIDERED
AN ACCEPTABLE LOSS.
140
00:08:47,482 --> 00:08:50,689
THE REJECTS WILL BE COMPOSTED.
141
00:08:50,689 --> 00:08:52,620
OUT OF THE OPTICAL SORTER,
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00:08:52,620 --> 00:08:55,655
AN EMPLOYEE TOSSES IN
THE BITTER GREENS,
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00:08:55,655 --> 00:08:58,965
LIKE RADICCHIO AND FRISéE.
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00:08:58,965 --> 00:09:03,137
THIS MOVING SALAD NOW HEADS
INTO A THREE-PART WASH SYSTEM.
145
00:09:03,137 --> 00:09:06,862
THE FIRST WASH TANK
HAS ROLLING PERFORATED CYLINDERS
146
00:09:06,862 --> 00:09:09,862
THAT KEEP THE GREENS SUBMERGED
FOR WASHING.
147
00:09:09,862 --> 00:09:12,482
THEY ALSO PICK UP
UNWANTED TINY LEAVES
148
00:09:12,482 --> 00:09:14,379
AND REMOVE THEM FROM THE MIX.
149
00:09:14,379 --> 00:09:17,448
THE SALAD GREENS TRANSFER
TO A VIBRATING CONVEYOR
150
00:09:17,448 --> 00:09:19,034
THAT SHAKES OUT THE WATER.
151
00:09:19,034 --> 00:09:21,689
THEN THEY TRAVEL
THROUGH A SECOND WASH TANK
152
00:09:21,689 --> 00:09:24,965
AND FINALLY RECEIVE A THIRD WASH
FROM OVERHEAD SPRAYERS.
153
00:09:24,965 --> 00:09:27,275
THE WASHED SALAD GREENS
154
00:09:27,275 --> 00:09:30,413
FALL INTO PLASTIC CONTAINERS
WITH PERFORATIONS.
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00:09:30,413 --> 00:09:33,241
THEY'RE ESSENTIALLY
VERY LARGE COLANDERS.
156
00:09:33,241 --> 00:09:37,862
THEY TRANSFER EACH COLANDER
TO A CENTRIFUGE AND POWER UP.
157
00:09:37,862 --> 00:09:39,793
IT SPINS THE COLANDER,
158
00:09:39,793 --> 00:09:42,344
AND THIS CAUSES THE MOISTURE
ON THE GREENS
159
00:09:42,344 --> 00:09:44,620
TO DRAIN
THROUGH THERE PERFORATIONS.
160
00:09:44,620 --> 00:09:46,413
THIS LEAVES THEM DRY AND CRISP.
161
00:09:46,413 --> 00:09:49,655
IT IS A LARGE-SCALE VERSION
OF THE SALAD SPINNER
162
00:09:49,655 --> 00:09:52,068
MANY PEOPLE HAVE
IN THEIR KITCHENS.
163
00:09:58,172 --> 00:10:02,103
THESE FIELD GREENS ARE NOW READY
FOR THE PACKAGING LINE.
164
00:10:02,103 --> 00:10:06,344
IT'S AN ENTIRELY MECHANIZED
SYSTEM WITH AN ENDLESS APPETITE.
165
00:10:13,344 --> 00:10:17,620
THE GREENS FUNNEL THROUGH
A HOPPER AND LAND IN BUCKETS.
166
00:10:20,137 --> 00:10:21,827
THIS IS A WEIGHING OPERATION.
167
00:10:25,206 --> 00:10:28,862
THERE'S A SCALE
UNDER EACH BUCKET.
168
00:10:28,862 --> 00:10:31,172
WHEN THE TARGET WEIGHT
IS REACHED,
169
00:10:31,172 --> 00:10:34,068
THE BUCKET RELEASES THE GREENS.
170
00:10:34,068 --> 00:10:38,827
THEY SLIDE DOWN CHUTES
INTO THE BAGGING MACHINE.
171
00:10:38,827 --> 00:10:41,620
THESE SALAD GREENS ARE
STILL LIVING, BREATHING PLANTS.
172
00:10:41,620 --> 00:10:43,793
THE PACKAGING
WILL SLOW THEIR RESPIRATION
173
00:10:43,793 --> 00:10:47,448
AND PUT THE AGING PROCESS
ON HOLD.
174
00:10:47,448 --> 00:10:50,275
MACHINERY HERMETICALLY SEALS
THEM IN PLASTIC
175
00:10:50,275 --> 00:10:54,000
TO GIVE THEM A SHELF LIFE
OF 14 DAYS TO 19 DAYS.
176
00:10:54,000 --> 00:10:55,586
AND WITH THAT AVAILABILITY,
177
00:10:55,586 --> 00:10:59,724
THERE'S NO EXCUSE
NOT TO EAT YOUR GREENS.
178
00:11:10,000 --> 00:11:12,551
Narrator: WIND TURBINES USE
AN UNLIMITED NATURAL RESOURCE,
179
00:11:12,551 --> 00:11:13,965
THE WIND, TO PRODUCE ELECTRICITY
180
00:11:13,965 --> 00:11:16,137
WITHOUT POLLUTING
THE ENVIRONMENT.
181
00:11:16,137 --> 00:11:19,724
A TURBINE CONSISTS OF A ROTOR
AND A MASSIVE PROPELLER
182
00:11:19,724 --> 00:11:22,896
THAT SPINS IN THE WIND
ON TOP OF A HIGH TOWER.
183
00:11:22,896 --> 00:11:27,137
IT DRIVES A BUILT-IN GENERATOR
THAT PRODUCES ELECTRICITY.
184
00:11:31,793 --> 00:11:34,758
THE HIGHER UP YOU GO,
THE WINDIER IT IS.
185
00:11:34,758 --> 00:11:36,724
SO THE TALLER THE TURBINE,
186
00:11:36,724 --> 00:11:39,275
THE MORE WIND POWER
IT HARNESSES.
187
00:11:39,275 --> 00:11:42,103
THEY MAY NOT LOOK IT
FROM A DISTANCE,
188
00:11:42,103 --> 00:11:45,965
BUT WIND TURBINES CAN BE
AS HIGH AS A 20-STORY BUILDING
189
00:11:45,965 --> 00:11:49,931
WITH ROTOR BLADES
HALF A FOOTBALL FIELD LONG.
190
00:11:49,931 --> 00:11:53,413
TO BEGIN CONSTRUCTING
THOSE MASSIVE BLADES,
191
00:11:53,413 --> 00:11:56,310
WORKERS PREPARE
FIBERGLASS SHEETS,
192
00:11:56,310 --> 00:12:00,896
EACH ONE NUMBERED ACCORDING
TO A DETAILED ENGINEERING PLAN.
193
00:12:00,896 --> 00:12:02,931
THEN, FOLLOWING THE PLAN,
194
00:12:02,931 --> 00:12:06,551
WORKERS LAY DOWN SPECIFIC SHEETS
IN DESIGNATED LOCATIONS
195
00:12:06,551 --> 00:12:09,344
IN THE BOTTOM HALF
OF A BLADE-SHAPED MOLD.
196
00:12:14,241 --> 00:12:16,862
FOR A BLADE
TO BE FREE OF DEFECTS,
197
00:12:16,862 --> 00:12:19,482
EACH SHEET
MUST LIE PERFECTLY FLAT.
198
00:12:19,482 --> 00:12:21,310
SO, USING A SMOOTHING TOOL,
199
00:12:21,310 --> 00:12:24,034
WORKERS REMOVE AIR BUBBLES
AND CREASES.
200
00:12:29,103 --> 00:12:30,793
THE SURFACE OF THE MOLD CAVITY
201
00:12:30,793 --> 00:12:32,931
IS TREATED
WITH A NON-STICK COATING.
202
00:12:32,931 --> 00:12:35,758
THIS WILL PREVENT THE BLADE
FROM ADHERING TO THE MOLD
203
00:12:35,758 --> 00:12:37,275
WHEN THEY EXTRACT IT.
204
00:12:37,275 --> 00:12:41,275
AFTER PLACING ALL THE SHEETS
IN THE BOTTOM HALF OF THE MOLD,
205
00:12:41,275 --> 00:12:44,482
WORKERS CONSTRUCT
THE UPPER PART OF THE BLADE
206
00:12:44,482 --> 00:12:48,620
BY LAYING FIBERGLASS SHEETS ON
THE TOP HALF OF THE BLADE MOLD.
207
00:12:48,620 --> 00:12:52,034
AGAIN, EVERY SINGLE SHEET
IS NUMBERED AND POSITIONED
208
00:12:52,034 --> 00:12:54,482
ACCORDING
TO THE BLADE-DESIGN PLAN.
209
00:12:54,482 --> 00:13:00,482
AN AREA OF THE MOLD CAN HAVE
FROM FOR TO 120 LAYERED SHEETS
210
00:13:00,482 --> 00:13:02,862
OF VARYING THICKNESS, WEIGHTS,
AND WEAVES,
211
00:13:02,862 --> 00:13:05,586
DEPENDING
ON HOW STRUCTURALLY STRONG
212
00:13:05,586 --> 00:13:08,137
THAT PART OF THE BLADE
HAS TO BE.
213
00:13:08,137 --> 00:13:10,758
TO MAKE SPECIFIC AREAS
MORE RIGID,
214
00:13:10,758 --> 00:13:14,275
BETWEEN LAYERS OF FIBERGLASS
THEY INSTALL BALSA,
215
00:13:14,275 --> 00:13:16,344
AN EXTREMELY LIGHTWEIGHT WOOD.
216
00:13:16,344 --> 00:13:19,000
CUT CHANNELS ENABLE
THE BALSA PANELS
217
00:13:19,000 --> 00:13:21,551
TO FLEX TO THE SHAPE
OF THE BLADE.
218
00:13:21,551 --> 00:13:24,103
THE CHANNELS
ARE ALSO THE PATHWAYS
219
00:13:24,103 --> 00:13:27,310
THROUGH WHICH THE BONDING AGENT
EPOXY WILL FLOW
220
00:13:27,310 --> 00:13:30,586
TO SATURATE THE WOOD
AND SURROUNDING FIBERGLASS.
221
00:13:33,068 --> 00:13:37,793
PRECISION IN THE SETUP OF
FIBERGLASS AND WOOD IS CRITICAL.
222
00:13:37,793 --> 00:13:41,827
THE PROCESS TAKES
A TEAM OF SIX WORKERS 16 HOURS.
223
00:13:44,000 --> 00:13:45,448
THEY CLOSE UP THE MOLD
224
00:13:45,448 --> 00:13:48,310
BY LOWERING THE TOP HALF
ONTO THE BOTTOM HALF.
225
00:13:50,862 --> 00:13:54,931
THEN THEY INJECT THE EPOXY.
226
00:13:54,931 --> 00:14:01,724
SIMULTANEOUSLY, WORKERS HEAT THE
MOLD TO 158 DEGREES FAHRENHEIT.
227
00:14:01,724 --> 00:14:03,586
THIS AIDS THE CHEMICAL REACTION
228
00:14:03,586 --> 00:14:05,931
BETWEEN
THE EPOXY'S TWO COMPONENTS --
229
00:14:05,931 --> 00:14:08,551
A RESIN AND A HARDENER.
230
00:14:08,551 --> 00:14:12,689
AFTER 9½ HOURS,
THE EPOXY IS FULLY CURED.
231
00:14:12,689 --> 00:14:14,206
WITH OVERHEAD CRANES,
232
00:14:14,206 --> 00:14:17,068
THEY LIFT AWAY
THE TOP HALF OF THE MOLD,
233
00:14:17,068 --> 00:14:20,793
REVEALING A TURBINE BLADE
MEASURING UP TO 60 YARDS LONG,
234
00:14:20,793 --> 00:14:25,206
WEIGHING IN AT ABOUT 10 TONS.
235
00:14:31,724 --> 00:14:35,206
USING LIFTING DEVICES POSITIONED
AT SPECIFIC LOCATIONS,
236
00:14:35,206 --> 00:14:39,068
THEY SLOWLY EXTRACT THE BLADE
FROM THE BOTTOM HALF OF THE MOLD
237
00:14:39,068 --> 00:14:46,000
AND LAY IT ONTO A STAND
TO COOL FOR 4½ HOURS.
238
00:14:51,344 --> 00:14:55,206
WORKERS THEN TRANSFER THE BLADE
TO A MILL-AND-DRILL MACHINE,
239
00:14:55,206 --> 00:14:58,724
WHICH SHAPES THE OPEN END
TO ALIGN WITH THE ROTOR HUB.
240
00:14:58,724 --> 00:15:02,310
THE MACHINE ALSO DRILLS HOLES
FOR THE 54 PIN BOLTS
241
00:15:02,310 --> 00:15:04,965
THAT WILL FASTEN THE BLADE
TO THE HUB.
242
00:15:04,965 --> 00:15:08,275
NEXT, WORKERS GRIND AWAY
THE SEAM OF HARDENED EPOXY
243
00:15:08,275 --> 00:15:11,448
THAT FORMED WHERE THE TWO HALVES
OF THE MOLD MET
244
00:15:11,448 --> 00:15:14,413
AND SAND THE SURFACE
PERFECTLY SMOOTH.
245
00:15:14,413 --> 00:15:18,034
THEN THEY SPRAY THE BLADE
WITH A COAT OF PRIMER,
246
00:15:18,034 --> 00:15:20,206
WHICH THEY LET CURE
FOR SIX HOURS.
247
00:15:20,206 --> 00:15:22,758
THEN A COAT
OF EPOXY-BASED PAINT,
248
00:15:22,758 --> 00:15:25,689
LETTING THAT CURE
FOR ABOUT EIGHT HOURS.
249
00:15:25,689 --> 00:15:29,517
THEN WORKERS INSERT
THOSE 54 PIN BOLTS
250
00:15:29,517 --> 00:15:32,482
MADE OF A PARTICULARLY STRONG
GRADE OF STEEL
251
00:15:32,482 --> 00:15:35,137
AND TIGHTEN THEM
WITH A TORQUE WRENCH.
252
00:15:35,137 --> 00:15:38,551
AFTER THIS, THEY WEIGH
EACH BLADE ON A FLOOR SCALE
253
00:15:38,551 --> 00:15:42,172
AND GROUP THREE BLADES
OF SIMILAR WEIGHT PER TURBINE
254
00:15:42,172 --> 00:15:45,482
TO ENSURE THE ROTATION
WILL BE BALANCED.
255
00:15:45,482 --> 00:15:48,724
THE INSTALL A COVER
OVER THE OPENED END OF THE BLADE
256
00:15:48,724 --> 00:15:51,137
TO PREVENT DEBRIS
FROM FALLING INSIDE
257
00:15:51,137 --> 00:15:53,413
DURING TRANSPORT
TO THE WIND FARM.
258
00:15:55,620 --> 00:15:58,931
UPON ARRIVAL, CREWS BOLT
THREE BLADES TO A ROTOR HUB,
259
00:15:58,931 --> 00:16:02,241
THEN HOIST THE ROTOR
TO THE TOP OF THE TURBINE TOWER
260
00:16:02,241 --> 00:16:05,103
AND CONNECT IT TO THE NACELLE.
261
00:16:17,724 --> 00:16:20,103
Narrator: THE NACELLE
IS THE PART OF A WIND TURBINE
262
00:16:20,103 --> 00:16:22,172
WHICH TRANSFORMS WIND POWER
INTO ELECTRICITY.
263
00:16:22,172 --> 00:16:24,068
WITH THE ROTOR MOUNTED TO IT,
264
00:16:24,068 --> 00:16:26,620
THE NACELLE HOUSES
A GIANT DRIVETRAIN.
265
00:16:26,620 --> 00:16:30,241
IT MULTIPLIES THE ROTATIONAL
SPEED OF THE SPINNING BLADES
266
00:16:30,241 --> 00:16:32,862
THEN TRANSFERS IT
TO A MASSIVE GENERATOR,
267
00:16:32,862 --> 00:16:34,517
WHICH PRODUCES ELECTRICITY.
268
00:16:37,827 --> 00:16:40,827
A WIND TURBINE'S ROTOR
IS MADE OF THREE BLADES
269
00:16:40,827 --> 00:16:42,241
ATTACHED TO A HUB.
270
00:16:42,241 --> 00:16:45,172
THE HUB ALONE WEIGHS
MORE THAN 30 TONS.
271
00:16:45,172 --> 00:16:49,655
IT'S CAST FROM DUCTILE IRON,
A STRONG GRADE OF CAST IRON.
272
00:16:52,172 --> 00:16:55,310
AT THE FACTORY, THEY USE A CRANE
TO HOIST AND AFFIX
273
00:16:55,310 --> 00:16:57,862
THE HUB CASTING
TO AN ASSEMBLY FIXTURE.
274
00:16:57,862 --> 00:17:03,000
THIS FIXTURE HOLDS THE HUB
SECURELY IN A SUSPENDED POSITION
275
00:17:03,000 --> 00:17:05,206
WHILE WORKERS MOUNT COMPONENTS
TO IT,
276
00:17:05,206 --> 00:17:07,310
STARTING
WITH THREE BLADE BEARINGS.
277
00:17:07,310 --> 00:17:10,034
A BLADE BEARING
IS A GIANT BALL BEARING
278
00:17:10,034 --> 00:17:12,068
TO WHICH THE BLADE IS ATTACHED.
279
00:17:12,068 --> 00:17:15,172
WHEN IT ROTATES,
THE BLADE PITCHES,
280
00:17:15,172 --> 00:17:17,310
MEANING IT CHANGES ANGLE.
281
00:17:17,310 --> 00:17:19,965
BLADES NEED TO BE PITCHED
TO BETTER CATCH THE WIND
282
00:17:19,965 --> 00:17:22,758
AND TO SPIN AT OPTIMAL SPEED.
283
00:17:22,758 --> 00:17:28,482
EACH BEARING ATTACHES TO THE HUB
WITH 54 HUGE BOLTS.
284
00:17:28,482 --> 00:17:32,068
THE NEXT HUB COMPONENTS --
THREE ACCUMULATORS --
285
00:17:32,068 --> 00:17:34,137
ONE FOR EACH BLADE BEARING.
286
00:17:34,137 --> 00:17:38,000
AN ACCUMULATOR STORES
HYDRAULIC OIL UNDER PRESSURE.
287
00:17:38,000 --> 00:17:40,862
THIS OIL MOVES
HYDRAULIC CYLINDERS,
288
00:17:40,862 --> 00:17:44,482
WHICH ROTATE THE BLADE BEARING
TO PITCH THE BLADE.
289
00:17:44,482 --> 00:17:47,103
WORKERS ASSEMBLE
EACH ACCUMULATOR,
290
00:17:47,103 --> 00:17:50,655
MOUNT ITS COVER,
291
00:17:50,655 --> 00:17:53,517
THEN INSTALL IT
ON A BLADE BEARING.
292
00:18:00,413 --> 00:18:02,310
ONCE ALL THREE ACCUMULATORS
293
00:18:02,310 --> 00:18:04,793
AND OTHER COMPONENTS
ARE INSTALLED,
294
00:18:04,793 --> 00:18:06,241
THE HUB IS FINISHED.
295
00:18:06,241 --> 00:18:08,724
THEY REMOVE IT
FROM THE ASSEMBLY FIXTURE
296
00:18:08,724 --> 00:18:11,344
AND PUT A FIBERGLASS COVER
OVER EACH BEARING
297
00:18:11,344 --> 00:18:13,103
TO PROTECT THE WORKINGS INSIDE.
298
00:18:15,931 --> 00:18:18,034
MEANWHILE, IN THE SAME FACTORY,
299
00:18:18,034 --> 00:18:21,034
WORKERS ASSEMBLE
THE WIND TURBINE'S NACELLE.
300
00:18:21,034 --> 00:18:22,448
FIRST, THEY LAY OUT
301
00:18:22,448 --> 00:18:25,275
THE BOTTOM SECTION
OF ITS STEEL HOUSING,
302
00:18:25,275 --> 00:18:28,551
THEN THEY ASSEMBLE
THE YAW SYSTEM,
303
00:18:28,551 --> 00:18:31,758
THE KEY COMPONENT THAT ENABLES
THE NACELLE AND ROTOR
304
00:18:31,758 --> 00:18:34,655
TO ROTATE 360 DEGREES.
305
00:18:34,655 --> 00:18:36,655
THEY MOUNT
A LARGE STATIONARY GEAR
306
00:18:36,655 --> 00:18:38,931
IN THE CENTER
OF THE SYSTEM'S MAINFRAME.
307
00:18:38,931 --> 00:18:42,517
THEN, ON THE REVERSE SIDE
OF THE MAINFRAME,
308
00:18:42,517 --> 00:18:44,862
THEY INSTALL EIGHT YAW GEARS.
309
00:18:44,862 --> 00:18:49,517
THESE SMALLER GEARS ENGAGE THE
LARGE GEAR ON THE OTHER SIDE.
310
00:18:51,862 --> 00:18:56,379
FULLY ASSEMBLED, THE MAINFRAME
WEIGHS MORE THAN 22 TONS.
311
00:18:56,379 --> 00:19:00,275
WORKERS HOIST IT WITH A CRANE,
THEN INSTALL IT
312
00:19:00,275 --> 00:19:03,448
INTO THE BOTTOM SECTION
OF THE NACELLE'S STEEL HOUSING.
313
00:19:03,448 --> 00:19:04,862
THEY CONNECT THE GEARBOX
314
00:19:04,862 --> 00:19:07,551
TO THE REST
OF THE NACELLE'S DRIVETRAIN.
315
00:19:07,551 --> 00:19:10,448
IT WORKS LIKE A CAR TRANSMISSION
IN REVERSE.
316
00:19:10,448 --> 00:19:13,655
WHILE THE CAR TRANSMISSION
TAKES COMBUSTION-PRODUCED ENERGY
317
00:19:13,655 --> 00:19:16,724
AND TURNS IT INTO ROTATION --
THE CAR WHEEL'S TURNING --
318
00:19:16,724 --> 00:19:19,206
THE NACELLE DRIVETRAIN
TAKES ROTATION --
319
00:19:19,206 --> 00:19:21,413
THE BLADES SPINNING
IN THE WIND --
320
00:19:21,413 --> 00:19:23,379
AND TURNS IT
INTO ELECTRICAL ENERGY.
321
00:19:23,379 --> 00:19:24,862
THOSE SPINNING BLADES ROTATE
322
00:19:24,862 --> 00:19:27,896
THE DRIVETRAIN'S
MASSIVE STEEL SHAFT.
323
00:19:27,896 --> 00:19:31,344
THE OPPOSITE END OF THAT SHAFT
CONNECTS TO THE GEARBOX.
324
00:19:31,344 --> 00:19:34,103
THE GEAR'S MULTIPLY
THE SPEED OF ROTATION,
325
00:19:34,103 --> 00:19:35,793
ROTATING THE SECOND SHAFT,
326
00:19:35,793 --> 00:19:38,034
WHICH THEY NOW CONNECT
TO A GENERATOR,
327
00:19:38,034 --> 00:19:40,241
INSTALLED INSIDE
THE NACELLE HOUSING.
328
00:19:40,241 --> 00:19:42,965
THE SECOND SHAFT
POWERS THE GENERATOR,
329
00:19:42,965 --> 00:19:44,827
WHICH PRODUCES ELECTRICITY.
330
00:19:44,827 --> 00:19:48,137
AFTER CONNECTING THE DRIVETRAIN
TO THE GENERATOR,
331
00:19:48,137 --> 00:19:51,275
WORKERS INSTALL
THE TOP SECTION OF THE HOUSING,
332
00:19:51,275 --> 00:19:54,310
AS WELL AS ACCESS DOORS
FOR MAINTENANCE WORK.
333
00:19:57,068 --> 00:19:59,793
TECHNICIANS
CONDUCT VARIOUS TESTS
334
00:19:59,793 --> 00:20:02,551
TO MAKE SURE
EVERYTHING RUNS PROPERLY.
335
00:20:02,551 --> 00:20:06,448
HERE, THEY ARE VERIFYING THE FAN
THAT COOLS THE GENERATOR.
336
00:20:17,068 --> 00:20:21,172
THE FINISHED NACELLE LOOKS LIKE
A MAMMOTH AA BATTERY.
337
00:20:21,172 --> 00:20:23,931
IT WEIGHS 85 TONS.
338
00:20:23,931 --> 00:20:26,793
NEARLY HALF OF THAT
IS THE DRIVETRAIN.
339
00:20:29,827 --> 00:20:32,862
THE PLANT SHIPS
BOTH THE NACELLE AND THE HUB
340
00:20:32,862 --> 00:20:36,310
SEPARATELY TO THE WIND FARM
BY EITHER TRUCK OR RAIL.
341
00:20:36,310 --> 00:20:38,620
THE BLADES ARE SHIPPED
TO THE FARM
342
00:20:38,620 --> 00:20:41,862
FROM ANOTHER FACTORY
AND THE TOWER FROM YET ANOTHER.
343
00:20:45,482 --> 00:20:49,758
ONCE ALL THE PARTS ARRIVE
ON SITE, ASSEMBLY CAN BEGIN.
344
00:20:49,758 --> 00:20:52,344
CREWS FIRST DIRECT THE TOWER.
345
00:20:52,344 --> 00:20:56,206
THEN THEY HOIST THE NACELLE ALL
THE WAY TO THE TOP AND MOUNT IT.
346
00:20:56,206 --> 00:20:58,724
ON THE GROUND,
THEY ASSEMBLE THE ROTOR
347
00:20:58,724 --> 00:21:01,137
BY INSTALLING THE BLADES
IN THE HUB.
348
00:21:01,137 --> 00:21:05,103
THEN THEY HOIST THE ROTOR
TO THE TOP OF THE TOWER
349
00:21:05,103 --> 00:21:07,448
AND MOUNT IT TO THE NACELLE.
350
00:21:07,448 --> 00:21:11,482
AND FROM THAT POINT ON,
THE WIND DOES ALL THE WORK.
351
00:21:23,793 --> 00:21:26,172
IF YOU HAVE ANY COMMENTS
ABOUT THE SHOW,
352
00:21:26,172 --> 00:21:28,620
OR IF YOU'D LIKE TO SUGGEST
TOPICS FOR FUTURE SHOWS,
353
00:21:28,620 --> 00:21:30,793
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