All language subtitles for S23E04 - Railway Bridge Ties; Membrane Filters; Hydraulic Post Drivers; Bi-planes (1080p AMZN WEB-DL x265 Garshasp)_track4_[eng]
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--Captions by VITAC--
www.vitac.com
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00:00:04,620 --> 00:00:07,620
CAPTIONS PAID FOR BY
DISCOVERY COMMUNICATIONS
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Narrator:
THE DECK OF A RAILWAY BRIDGE
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IS TYPICALLY BUILT OF
WOOD-TIMBERS CALLED BRIDGE TIES.
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THEY'RE BOLTED
TO STEEL SUPPORT BEAMS
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00:01:02,000 --> 00:01:05,620
LOCATED ON CONCRETE PIERS
OVER THE WATER OR GULLY BELOW.
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00:01:05,724 --> 00:01:07,517
THE RAILS
ON WHICH THE TRAIN TRAVELS
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ARE BOLTED TO THE WOODEN TIES.
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WOOD ABSORBS THE NOISE
AND VIBRATION
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00:01:11,551 --> 00:01:13,068
OF THE PASSING TRAIN.
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THE LOAD
THE RAILWAY BRIDGE WILL CARRY
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DETERMINES THE SIZE OF ITS TIES.
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TO CALCULATE THE LOAD,
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00:01:22,000 --> 00:01:24,551
ENGINEERS FACTOR IN
THE NUMBER OF TRACKS,
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00:01:24,655 --> 00:01:28,275
VOLUME OF TRAFFIC,
WEIGHT OF THE TRANSPORTED CARGO,
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00:01:28,379 --> 00:01:32,103
AND WHETHER THE BRIDGE
IS STRAIGHT OR CURVED.
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A CURVE WILL PUT ADDITIONAL
STRESS ON THE STRUCTURE.
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THE WOOD OF CHOICE IS OAK
BECAUSE IT'S HARD AND STRONG.
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WHEN THE LOGS
ARRIVE AT THE SAWMILL,
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THEY COME FACE-TO-FACE
WITH A MENACING-LOOKING DEVICE
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CALLED A DEBARKER.
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A CONVEYOR MOVES THE SHIPMENT
TOWARD THE DEBARKER,
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THEN DROPS A SINGLE LOG IN FRONT
OF IT ONTO SPINNING ROLLERS.
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THE ROLLERS ROTATE THE LOG,
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WHILE THE DEBARKER MAKES ITS WAY
FROM ONE END TO THE OTHER.
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IT CHEWS OFF THE BARK
WITH ITS SHARP-TOOTHED BLADES.
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WHAT THE DEBARKER SHAVES
OFF IS PUT TO GOOD USE.
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THE BARK GETS PROCESSED
INTO GARDENING MULCH
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00:02:18,068 --> 00:02:20,758
AND THEY BURN THE SAWDUST
IN THE WOOD-FIRED BOILER
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THAT RUNS ANOTHER PART
OF THE PLANT.
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NEXT, ONE LOG AT A TIME
DROPS INTO A MOBILE CARRIAGE
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THAT RUNS IT
THROUGH A CIRCULAR SAW.
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THE CARRIAGE HAS SENSORS
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WHICH DETECT
THE LOG'S EXTREMITIES
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AND REPORT ITS DIMENSIONS
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TO A CONSOLE LOCATED
IN THE OPERATOR'S CAB.
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THE OPERATOR
INTERPRETS THE DATA.
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USING A JOYSTICK CONTROLLER,
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00:02:44,862 --> 00:02:47,034
HE FLIPS THE LOG
INTO WHICHEVER POSITION
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00:02:47,137 --> 00:02:49,000
MAXIMIZES THE YIELD.
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00:02:51,482 --> 00:02:52,724
THE FIRST FEW RUNS
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TRIM OFF THE ROUGH SURFACE
AND SQUARE THE SHAPE.
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00:02:56,586 --> 00:02:58,448
THE NEXT RUNS CUT BOARDS,
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00:02:58,551 --> 00:03:01,344
WHICH THE SAWMILL
SELLS TO FLOORING PLANTS.
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THIS CONTINUES UNTIL THE LOG
IS THE EXACT DIMENSIONS
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OF THE BRIDGE TIE.
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AGAIN, NOTHING IS WASTED.
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00:03:09,724 --> 00:03:12,896
THE SAWMILL PROCESSES
THE CUTOFFS INTO WOOD CHIPS,
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00:03:13,000 --> 00:03:15,896
WHICH IT THEN SELLS TO COMPANIES
THAT MAKE PARTICLE BOARD,
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00:03:16,000 --> 00:03:19,758
STRAND BOARD, AND SIMILAR
CONSTRUCTION MATERIALS.
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THE SAWMILL STACKS THE TIES
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FOR TRANSFER
TO THE BRIDGE MILL NEXT DOOR.
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THE ROLE OF THE BRIDGE MILL
IS TO FRAME THE BRIDGE,
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ALSO KNOWN AS DAPPING.
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00:03:31,896 --> 00:03:34,827
THAT'S THE PROCESS
OF MAKING THE SPECIFIC HOLES
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00:03:34,931 --> 00:03:36,379
AND NOTCHES IN EACH TIE
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FOR ATTACHING IT TO THE STEEL
BEAM ON WHICH IT WILL SIT.
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AT THE BRIDGE MILL,
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00:03:44,172 --> 00:03:48,275
THE BRIDGE LAYOUT SUPERVISOR
PROCESSES ONE TIE AT A TIME.
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00:03:48,379 --> 00:03:51,000
HE CAREFULLY REVIEWS
THE ENGINEER'S BLUEPRINTS,
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00:03:51,103 --> 00:03:53,793
WHICH ASSIGN A NUMBER
TO EACH AND EVERY TIE.
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00:03:53,896 --> 00:03:58,413
THESE NUMBERS SPECIFY PRECISELY
WHERE THE SAW HAS TO CUT NOTCHES
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00:03:58,517 --> 00:04:01,344
AND WHERE THE DRILL
HAS TO BORE HOLES.
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00:04:01,448 --> 00:04:03,517
THE LOCATIONS OF THESE NOTCHES
AND HOLES VARY,
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00:04:03,620 --> 00:04:06,068
DEPENDING ON THE TIE'S POSITION
ON THE BRIDGE.
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00:04:06,172 --> 00:04:09,482
SO, HE MUST FOLLOW
THE BLUEPRINTS METICULOUSLY.
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00:04:11,689 --> 00:04:13,896
AFTER MEASURING
AND MARKING IT ALL OUT,
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00:04:14,000 --> 00:04:17,551
HE SENDS THE TIE TO THE DAP SAW.
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00:04:17,655 --> 00:04:19,379
THE OPERATOR SETS UP EACH CUT,
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00:04:19,482 --> 00:04:21,206
LINING UP THE MARK
WITH LASER-LIGHTS,
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00:04:21,310 --> 00:04:23,413
WHICH INDICATE THE LOCATION
AND THE CUTTING DEPTH
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OF THE BLADE.
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00:04:38,827 --> 00:04:42,068
THE NOTCHES ARE JUST THE RIGHT
SIZE TO FIT OVER THE STEEL BEAM
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00:04:42,172 --> 00:04:44,206
ON WHICH THE TIE WILL LIE.
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00:04:45,827 --> 00:04:48,448
NEXT,
A WORKER USING A DRILL PRESS
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00:04:48,551 --> 00:04:51,172
BORES HOLES FOR HOOK BOLTS,
WHICH GO THROUGH THE TIE
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00:04:51,275 --> 00:04:53,896
TO SECURE IT
ONTO THE STEEL BEAMS.
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00:04:55,862 --> 00:04:59,137
EACH TIE RECEIVES A METAL
IDENTIFICATION TAG,
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00:04:59,241 --> 00:05:03,551
WHICH INCLUDES THE BRIDGE
AND TIE NUMBERS.
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00:05:03,655 --> 00:05:06,586
ON EACH END,
WORKERS NAIL ON A MESH PLATE,
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00:05:06,689 --> 00:05:09,586
MADE OF RUST-PROOF
GALVANIZED STEEL.
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00:05:09,689 --> 00:05:12,517
THE PLATE HAS TEETH DESIGNED
TO GRASP AND HOLD TOGETHER
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00:05:12,620 --> 00:05:16,448
THE WOOD FIBER TO PREVENT
THE END FROM SPLITTING.
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00:05:16,551 --> 00:05:19,655
AFTER NAILING THE ID TAG
TO ONE OF THE END PLATES,
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00:05:19,758 --> 00:05:23,068
WORKERS FORCE IN BOTH PLATES
WITH A PRESS.
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00:05:27,827 --> 00:05:31,689
THE TIE'S LAST STOP
IS THE ADJACENT TREATMENT PLANT.
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00:05:31,793 --> 00:05:34,620
THEY SPEND 24 HOURS
INSIDE A HIGH-TEMPERATURE,
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00:05:34,724 --> 00:05:36,103
HIGH-PRESSURE CHAMBER
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00:05:36,206 --> 00:05:40,000
WHICH PENETRATES THEM
WITH A CREOSOTE-BORATE SOLUTION.
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00:05:40,103 --> 00:05:43,103
THIS PROTECTS THE WOOD
FROM ROT AND INSECT DAMAGE
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00:05:43,206 --> 00:05:44,965
AND EXTENDS THE TIE'S LIFE-SPAN
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00:05:45,068 --> 00:05:49,551
FROM ABOUT A DECADE
TO AT LEAST 25 YEARS.
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00:06:02,448 --> 00:06:03,551
Narrator:
WHEN FILTERING LIQUIDS,
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IT'S ALL ABOUT THINKING SMALL.
95
00:06:05,448 --> 00:06:09,310
MEMBRANE FILTERS CAN SEPARATE
THE TINIEST SOLIDS FROM FLUIDS,
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00:06:09,413 --> 00:06:12,827
WHICH PURIFIES THE LIQUIDS
AND RECOVERS THE SOLIDS.
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00:06:12,931 --> 00:06:15,137
ONCE SEPARATED,
THE TWO SUBSTANCES
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00:06:15,241 --> 00:06:19,448
MAY THEN BE REUSED
SO THAT NOTHING GOES TO WASTE.
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00:06:23,724 --> 00:06:28,724
MEMBRANE FILTERS CAN TURN MURKY
WATER CLEAR, ALMOST MAGICALLY.
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00:06:30,758 --> 00:06:34,241
TO DEMONSTRATE, A TECHNICIAN
INSTALLS A SPIRAL-WOUND MEMBRANE
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00:06:34,344 --> 00:06:36,517
IN THE HOUSING
OF A PUMPING SYSTEM,
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00:06:36,620 --> 00:06:37,965
WHICH IS A SMALL-SCALE VERSION
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00:06:38,068 --> 00:06:41,551
OF WHAT YOU WOULD SEE
IN A FACTORY.
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00:06:41,655 --> 00:06:45,413
SHE TURNS ON THE TAP,
AND WATER FLOWS INTO A TANK.
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00:06:45,517 --> 00:06:49,172
SHE ADDS LATEX PAINT
TO PURPOSELY SULLY THE WATER.
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00:06:51,586 --> 00:06:53,655
THE SYSTEM PUMPS
THE CONTAMINATED WATER
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00:06:53,758 --> 00:06:55,172
THROUGH A STRAINER
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00:06:55,275 --> 00:07:00,379
AND THEN THE MEMBRANE FILTER
WHILE METERS MEASURE THE FLOW.
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00:07:00,482 --> 00:07:03,034
WITHIN MINUTES, THE PAINT
HAS BEEN FILTERED OUT,
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00:07:03,137 --> 00:07:05,275
AND THE WATER IS CLEAR.
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00:07:06,655 --> 00:07:11,241
THE MAKING OF A MEMBRANE FILTER
BEGINS WITH POLYPROPYLENE MESH.
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00:07:14,724 --> 00:07:18,965
AN AUTOMATED SYSTEM UNWINDS
THE MESH AND CUTS IT TO LENGTH.
113
00:07:19,068 --> 00:07:22,586
THESE MESH SHEETS
WILL BE USED AS SPACERS.
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00:07:23,827 --> 00:07:25,931
THEY'LL CREATE GAPS
FOR THE LIQUID
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00:07:26,034 --> 00:07:29,000
TO FLOW THROUGH THE FILTER
AND OVER THE MEMBRANE.
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00:07:30,034 --> 00:07:33,275
NEXT, THE SYSTEM
CUTS SHEETS OF POLYESTER FABRIC.
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00:07:33,379 --> 00:07:34,827
THESE WILL FORM CHANNELS
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00:07:34,931 --> 00:07:37,793
THROUGH WHICH THE FILTERED
MATERIAL WILL TRAVEL.
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00:07:37,896 --> 00:07:41,586
THESE SHEETS ARE KNOWN
AS PERMEATE SPACERS.
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00:07:41,689 --> 00:07:45,655
AN EMPLOYEE STACKS
THE POLYESTER FABRIC SHEETS.
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00:07:45,758 --> 00:07:47,896
USING HIGH-FREQUENCY
SOUND WAVES,
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00:07:48,000 --> 00:07:51,655
SHE WELDS ONE SHEET TO THE NEXT
AT JUST ONE END.
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00:07:54,620 --> 00:07:58,103
SHE LAYERS AND WELDS
A TOTAL OF 15 SHEETS,
124
00:07:58,206 --> 00:08:00,137
AND THEN APPLIES
DOUBLE-SIDED TAPE.
125
00:08:00,241 --> 00:08:03,413
THE TAPE IS FOR ATTACHING
THE PACKET TO A CENTRAL TUBE,
126
00:08:03,517 --> 00:08:07,379
AND IT WILL ALSO SERVE AS
A GUIDE TO CORRECTLY ALIGN IT.
127
00:08:10,758 --> 00:08:14,482
NEXT, THE MEMBRANE SOUP
FLOWS INTO A LONG TROUGH.
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00:08:14,586 --> 00:08:18,827
IT'S A MIX
OF MELTED PLASTICS AND SOLVENTS.
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00:08:18,931 --> 00:08:21,862
PAPER BACKING UNWINDS
INTO THE TROUGH
130
00:08:21,965 --> 00:08:25,620
AND IS COATED WITH THE SOUP
ON ONE SIDE.
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00:08:25,724 --> 00:08:28,758
THE COATED PAPER THEN TRAVELS
THROUGH TWO QUENCH TANKS,
132
00:08:28,862 --> 00:08:31,344
AND THE PLASTIC COMPONENTS
SOLIDIFY
133
00:08:31,448 --> 00:08:33,689
AS THE SOLVENTS ARE DRAWN OUT.
134
00:08:33,793 --> 00:08:36,689
THE EXITING SOLVENTS
CREATE A UNIQUE CORE STRUCTURE
135
00:08:36,793 --> 00:08:39,896
IN THE REMAINING
WHITE PLASTIC MEMBRANE.
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00:08:40,000 --> 00:08:42,620
THE MEMBRANE NOW
TRAVELS BY A LIGHT BOX,
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00:08:42,724 --> 00:08:46,000
WHICH ILLUMINATES
ANY VISUAL DEFECTS.
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00:08:46,103 --> 00:08:50,551
AN APPLICATOR ALSO DRIPS A
PRESERVATIVE ONTO THE MEMBRANE.
139
00:08:50,655 --> 00:08:54,310
A TEAM UNROLLS THE MEMBRANE
ONTO A WORK TABLE.
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00:08:56,620 --> 00:08:58,965
THEY LAY A SHEET
OF THE POLYPROPYLENE MESH,
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00:08:59,068 --> 00:09:02,862
WHICH WE SAW CUT TO SIZE
EARLIER, ON THE MEMBRANE.
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00:09:05,551 --> 00:09:07,862
THE EMPLOYEE
THEN CUTS THE MEMBRANE
143
00:09:07,965 --> 00:09:10,586
TO TWICE THE LENGTH OF THE MESH.
144
00:09:10,689 --> 00:09:12,551
THEY FOLD THE MEMBRANE
OVER THE MESH,
145
00:09:12,655 --> 00:09:14,931
CREATING A MEMBRANE ENVELOPE.
146
00:09:15,034 --> 00:09:17,000
THE MESH SERVES AS A PATHWAY
FOR FLUID
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00:09:17,103 --> 00:09:19,655
TO FLOW BETWEEN THE MEMBRANES.
148
00:09:22,724 --> 00:09:24,206
MEANWHILE, ANOTHER WORKER
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00:09:24,310 --> 00:09:27,896
APPLIES EPOXY
TO PERFORATED PLASTIC TUBE.
150
00:09:28,000 --> 00:09:30,206
HE ATTACHES
THE PERMEATE SPACERS TO IT
151
00:09:30,310 --> 00:09:31,793
WITH THE DOUBLE-SIDED TAPE,
152
00:09:31,896 --> 00:09:35,724
GIVING THE EPOXY TIME TO CURE
FOR A PERMANENT SEAL.
153
00:09:37,586 --> 00:09:39,758
HE AND A COLLEAGUE
APPLY MORE EPOXY
154
00:09:39,862 --> 00:09:43,103
TO THE PERIMETER
OF THE BOTTOM SHEET.
155
00:09:43,206 --> 00:09:45,068
THEY TRANSFER
THE MEMBRANE ENVELOPE TO IT
156
00:09:45,172 --> 00:09:46,896
AND CONTINUE TO LAYER,
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00:09:47,000 --> 00:09:50,034
MAKING A PERMEATE FABRIC
AND MEMBRANE SANDWICH.
158
00:09:53,655 --> 00:09:55,965
THE WORKER THEN WINDS
THE GLUED LAYERS SNUGGLY
159
00:09:56,068 --> 00:09:58,103
TO A PERFORATED PLASTIC CORE,
160
00:09:58,206 --> 00:10:00,931
FORMING
THE SPIRAL MEMBRANE FILTER.
161
00:10:02,724 --> 00:10:06,344
HE TAPES THE MULTI-LAYERED WAD
FROM ONE END TO THE OTHER.
162
00:10:06,448 --> 00:10:08,517
THE TAPE HOLDS EVERYTHING
TIGHTLY IN PLACE
163
00:10:08,620 --> 00:10:11,241
AS THE EPOXY CURES OVERNIGHT.
164
00:10:12,758 --> 00:10:15,034
THEY LEAVE THE TAPE
ON AFTER THE CURE,
165
00:10:15,137 --> 00:10:17,862
AND A MACHINE WINDS
EPOXY-DRENCHED FIBERGLASS ROPE
166
00:10:17,965 --> 00:10:20,000
AROUND THE ENTIRE FILTER.
167
00:10:20,103 --> 00:10:23,068
AS THE EPOXY CURES,
168
00:10:23,172 --> 00:10:27,724
THE ROPE WILL FORM A HARD SHELL
AROUND THE MEMBRANE FILTER.
169
00:10:27,827 --> 00:10:29,206
PARTWAY THROUGH,
170
00:10:29,310 --> 00:10:31,862
THEY APPLY THE LABEL
WITH A COMPANY NAME.
171
00:10:35,206 --> 00:10:40,551
THE OPERATOR CAPTURES THE GLUE
RUNOFF DURING THE WIND.
172
00:10:40,655 --> 00:10:43,517
AND IT'S A WRAP,
SO HE CUTS THE ROPE.
173
00:10:45,758 --> 00:10:47,655
FROM THE SIDE,
YOU CAN SEE THE FLOW CHANNELS
174
00:10:47,758 --> 00:10:49,758
BETWEEN THE LAYERS.
175
00:10:49,862 --> 00:10:53,517
CONCENTRATED CONTAMINANTS WILL
TRAVEL THROUGH THEM AND OUT.
176
00:10:53,620 --> 00:10:57,000
THE FILTERED LIQUID WILL SEEP
INTO THE CORE AND EXIT,
177
00:10:57,103 --> 00:10:59,275
CLEARLY IMPROVED.
178
00:11:11,172 --> 00:11:12,689
Narrator: THE INVENTION
OF THE HYDRAULIC POST DRIVER
179
00:11:12,793 --> 00:11:14,310
IN THE 1960s
180
00:11:14,413 --> 00:11:17,241
ALLOWED WORKERS TO DROP
THEIR SHOVELS AND SLEDGEHAMMERS
181
00:11:17,344 --> 00:11:20,344
AND LET A MACHINE DO THE JOB
OF POUNDING FENCE AND SIGN POSTS
182
00:11:20,448 --> 00:11:21,827
INTO THE GROUND.
183
00:11:21,931 --> 00:11:24,413
WHEN IT COMES
TO LABOR-SAVING INVENTIONS,
184
00:11:24,517 --> 00:11:27,827
THIS ONE IS DEFINITELY
A STRIKING EXAMPLE.
185
00:11:31,413 --> 00:11:33,241
THE POST DRIVER
186
00:11:33,344 --> 00:11:36,965
RAISES HEFTY FENCE
OR SIGN POSTS INTO POSITION,
187
00:11:37,068 --> 00:11:40,413
AND THEN SLAMS THEM
INTO THE GROUND.
188
00:11:43,862 --> 00:11:47,448
INSIDE A VERTICAL CASE,
A HYDRAULIC SYSTEM
189
00:11:47,551 --> 00:11:50,172
DROPS A 300-POUND WEIGHT
TO DRIVE THE POST,
190
00:11:50,275 --> 00:11:52,206
AND THEN LIFTS IT
FOR ANOTHER HIT.
191
00:11:56,000 --> 00:11:59,241
THIS MACHINE DOES THE WORK
OF TWO OR MORE BRAWNY HUMANS
192
00:11:59,344 --> 00:12:03,379
WITH JUST ONE PERSON
AT THE CONTROLS.
193
00:12:03,482 --> 00:12:06,827
TO MAKE IT, THEY START WITH
A VERTICAL CASE FOR THE WEIGHT.
194
00:12:06,931 --> 00:12:08,862
A HIGH-PRECISION PLASMA TORCH
195
00:12:08,965 --> 00:12:11,206
CUTS STEEL
INTO A RECTANGULAR SHAPE
196
00:12:11,310 --> 00:12:13,724
AND MAKES HOLES FOR COMPONENTS.
197
00:12:15,103 --> 00:12:19,034
THEY INSERT THE RECTANGLE
INTO A BREAK-PRESS REPEATEDLY
198
00:12:19,137 --> 00:12:21,379
TO BEND IT
INTO A THREE-SIDED PART.
199
00:12:21,482 --> 00:12:23,517
THE PROFILE INCLUDES FLANGES
200
00:12:23,620 --> 00:12:27,103
FOR WELDING IT
TO THE BACK WALL OF THE CASE.
201
00:12:29,068 --> 00:12:31,000
HE FITS THE PART
TO THE BACK WALL
202
00:12:31,103 --> 00:12:34,965
AND WELDS THEM TOGETHER,
COMPLETING THE POST DRIVER CASE.
203
00:12:38,896 --> 00:12:41,758
AN EMPLOYEE BUILDS
THE POST DRIVER WEIGHT
204
00:12:41,862 --> 00:12:43,965
WORKING WITHIN A WELD FIXTURE.
205
00:12:45,758 --> 00:12:49,965
IT'S A BOX-SHAPED WEIGHT,
AND HE WELDS IT AT THE SEAMS.
206
00:12:51,896 --> 00:12:53,931
HE TAPS THE CORNERS
BETWEEN THE WELDS
207
00:12:54,034 --> 00:12:56,827
TO MAINTAIN
A TIGHT CONFIGURATION.
208
00:12:58,034 --> 00:13:02,000
THIS 300-POUND WEIGHT CAN LATER
BE FILLED WITH STEEL SHOT
209
00:13:02,103 --> 00:13:06,068
TO MAKE IT EVEN HEAVIER
FOR GREATER IMPACT.
210
00:13:06,172 --> 00:13:09,344
THE NEXT WORKER ASSEMBLES
YELLOW STEEL JAWS TO A HUB
211
00:13:09,448 --> 00:13:11,448
TO PRODUCE THE GRAPPLE.
212
00:13:11,551 --> 00:13:14,379
THIS IS THE PART
THAT GRIPS THE FENCE POST
213
00:13:14,482 --> 00:13:16,413
AND RAISES IT INTO POSITION.
214
00:13:19,068 --> 00:13:21,448
HE STICKS A DANGER LABEL
ONTO THE HUB
215
00:13:21,551 --> 00:13:25,275
TO WARN PEOPLE TO STAY CLEAR
OF THESE POWERFUL JAWS.
216
00:13:27,000 --> 00:13:29,241
HE ATTACHES
A HYDRAULIC CYLINDER,
217
00:13:29,344 --> 00:13:32,551
WHICH WILL MAKE
THE JAWS OPEN AND CLOSE.
218
00:13:34,068 --> 00:13:37,344
HE CONNECTS THE CYLINDER
TO THE GRAPPLE JAW.
219
00:13:40,034 --> 00:13:41,793
NEXT,
THEY MOVE ON TO THE METAL PLATE
220
00:13:41,896 --> 00:13:44,724
THAT WILL BE USED TO MOUNT
THE POST DRIVER TO A VEHICLE,
221
00:13:44,827 --> 00:13:47,551
LIKE A SKID-STEER LOADER.
222
00:13:47,655 --> 00:13:49,586
IT INCLUDES
A HYDRAULIC MECHANISM
223
00:13:49,689 --> 00:13:52,413
FOR TILTING THE FENCE POST
LEFT OR RIGHT.
224
00:13:56,103 --> 00:13:59,068
THE EMPLOYEE INSTALLS A CONTROL
VALVE NEXT TO THE CYLINDER
225
00:13:59,172 --> 00:14:02,620
AND LINKS THE TWO WITH HOSES.
226
00:14:02,724 --> 00:14:04,034
HE'LL ALSO CONNECT THE GRAPPLE
227
00:14:04,137 --> 00:14:06,689
AND WEIGHT HYDRAULICS
TO THIS VALVE.
228
00:14:14,413 --> 00:14:17,586
BACK TO THE POST DRIVER CASE
NOW -- IT'S BEEN PAINTED,
229
00:14:17,689 --> 00:14:20,206
AND THEY'RE READY TO INSTALL
THE HYDRAULIC MOTOR.
230
00:14:20,310 --> 00:14:22,793
THE WORKER CONNECTS IT
TO THE SPROCKETS AND CHAINS
231
00:14:22,896 --> 00:14:25,034
THAT WILL LIFT THE WEIGHT.
232
00:14:25,137 --> 00:14:26,862
HE PINS THE SPROCKETS INTO PLACE
233
00:14:26,965 --> 00:14:30,827
AND INSTALLS TENSIONING RODS
ON EITHER SIDE.
234
00:14:33,482 --> 00:14:36,896
NEXT, A COVER PLATE
PROTECTS THE SPROCKETS.
235
00:14:37,000 --> 00:14:39,965
THE TENSIONING RODS
PROTRUDE THROUGH IT.
236
00:14:41,103 --> 00:14:44,793
HE SLIDES SPRINGS
ONTO THOSE TENSIONING RODS
237
00:14:44,896 --> 00:14:48,000
AND COMPRESSES THE SPRINGS
TO MAINTAIN THE TENSION.
238
00:14:51,068 --> 00:14:54,896
HE NOW ATTACHES THE GRAPPLE
TO THE POST DRIVER CASE.
239
00:14:57,241 --> 00:14:59,896
HE LOCKS IT INTO PLACE
WITH A LONG PIN.
240
00:15:04,965 --> 00:15:08,068
HE LINKS THE GRAPPLE HYDRAULICS
TO THE CONTROL VALVE.
241
00:15:08,172 --> 00:15:10,344
AND IT'S READY TO GRAB
BIG FENCE POSTS
242
00:15:10,448 --> 00:15:12,758
AND HOLD ON TIGHT.
243
00:15:16,172 --> 00:15:21,068
THEY ATTACH THE METAL MOUNTING
PLATE TO THE POST DRIVER CASE.
244
00:15:21,172 --> 00:15:23,724
THE WORK TABLE TILTS BACK
TO MOVE THE POST DRIVER
245
00:15:23,827 --> 00:15:26,068
INTO AN UPRIGHT POSITION.
246
00:15:28,137 --> 00:15:29,482
WITH THE HELP OF A CRANE,
247
00:15:29,586 --> 00:15:32,275
THE NEXT WORKER
MOVES THE WEIGHT INTO POSITION
248
00:15:32,379 --> 00:15:34,758
AND LOWERS IT INTO THE CASE.
249
00:15:42,379 --> 00:15:44,034
HE SLIDES A PIN INTO THE TOP END
250
00:15:44,137 --> 00:15:45,793
TO KEEP THE WEIGHT
FROM FALLING OUT
251
00:15:45,896 --> 00:15:48,413
WHEN THE POST DRIVER
IS ON AN ANGLE.
252
00:15:53,655 --> 00:15:55,206
ONE DAY IN THE MAKING,
253
00:15:55,310 --> 00:15:59,620
THIS HYDRAULIC POST DRIVER IS
READY FOR YEARS OF HEAVY LABOR,
254
00:15:59,724 --> 00:16:05,000
TAKING OVER FOR HUMANS SO THEY
DON'T HAVE TO MOVE A MUSCLE.
255
00:16:17,827 --> 00:16:19,620
Narrator: A BIPLANE
IS A VINTAGE-STYLE AIRCRAFT
256
00:16:19,724 --> 00:16:22,758
WITH TWO PAIRS OF WINGS
SITTING ONE ABOVE THE OTHER.
257
00:16:22,862 --> 00:16:26,034
THE TOP WINGS ARE TYPICALLY
RAISED ABOVE THE FUSELAGE
258
00:16:26,137 --> 00:16:29,275
WITH VERTICAL STRUTS BRACING
THEM TO THE BOTTOM WINGS.
259
00:16:29,379 --> 00:16:32,172
DATING BACK TO THE EARLIEST DAYS
OF AVIATION,
260
00:16:32,275 --> 00:16:35,931
THEY'RE STILL POPULAR
FOR PERFORMING AEROBATICS.
261
00:16:36,034 --> 00:16:39,413
A BIPLANE'S LOWER WINGS
HAVE AILERONS,
262
00:16:39,517 --> 00:16:42,793
WHICH BANK THE AIRPLANE
TO THE RIGHT OR LEFT.
263
00:16:42,896 --> 00:16:44,068
ON THE PLANE'S TAIL,
264
00:16:44,172 --> 00:16:47,275
ELEVATORS PITCH THE PLANE'S NOSE
UP OR DOWN
265
00:16:47,379 --> 00:16:50,068
WHILE A RUDDER STEERS IT
LEFT OR RIGHT.
266
00:16:50,172 --> 00:16:53,448
A PROPELLER
PROVIDES THE PROPULSION.
267
00:16:53,551 --> 00:16:56,551
THE PLANE HAS FOUR WINGS.
268
00:16:56,655 --> 00:16:58,758
EACH WING HAS TWO SPARS,
269
00:16:58,862 --> 00:17:00,965
WOODEN BEAMS
AT THE FRONT AND REAR,
270
00:17:01,068 --> 00:17:03,034
WHICH FORM
THE PERIMETER STRUCTURE.
271
00:17:03,137 --> 00:17:07,862
A CRAFTSMAN SKILLFULLY FASHIONS
THESE SPARS OUT OF SITKA SPRUCE.
272
00:17:07,965 --> 00:17:11,482
THIS WOOD IS EXCEEDINGLY LIGHT,
YET EXCEPTIONALLY STRONG,
273
00:17:11,586 --> 00:17:13,344
MAKING IT ONE
OF ONLY A FEW WOODS
274
00:17:13,448 --> 00:17:17,551
APPROVED FOR STRUCTURAL USE
IN AIRPLANES.
275
00:17:17,655 --> 00:17:19,965
AFTER SAWING THE WOOD
TO THE SPAR'S SHAPE,
276
00:17:20,068 --> 00:17:22,931
HE MOUNTS ATTACHMENT PLATES
MADE OF SITKA SPRUCE
277
00:17:23,034 --> 00:17:24,862
AND MAHOGANY PLYWOOD.
278
00:17:24,965 --> 00:17:26,448
THESE ARE THE END STRUTS,
279
00:17:26,551 --> 00:17:28,827
STEEL VERTICAL BARS
WHICH WILL CONNECT THE UPPER
280
00:17:28,931 --> 00:17:31,068
AND LOWER WINGS.
281
00:17:31,172 --> 00:17:34,379
HE FINISHES THE SPAR
BY REFINING ITS CONTOUR,
282
00:17:34,482 --> 00:17:39,172
FIRST WITH A HAND PLANE,
THEN AN ELECTRIC PLANE.
283
00:17:39,275 --> 00:17:41,379
USING STRIPS OF SITKA SPRUCE,
284
00:17:41,482 --> 00:17:45,344
HE CONSTRUCTS 15 STRUCTURAL RIBS
FOR EACH WING.
285
00:17:45,448 --> 00:17:47,344
HE BEGINS WITH LONG STRIPS,
286
00:17:47,448 --> 00:17:51,275
WHICH HAVE BEEN SOAKING IN WATER
FOR A WEEK TO MAKE THEM PLIABLE.
287
00:17:51,379 --> 00:17:54,034
HE INSERTS ONE END
INTO A CURVED FIXTURE
288
00:17:54,137 --> 00:17:56,931
AND LEAVES THE STRIPS TO DRY.
289
00:17:57,034 --> 00:17:59,448
WHEN HE REMOVES THEM A COUPLE
OF DAYS LATER,
290
00:17:59,551 --> 00:18:02,068
THEY HAVE A PERMANENT
AERODYNAMIC CURVE.
291
00:18:02,172 --> 00:18:04,137
HE GLUES
TWO CURVED STRIPS TOGETHER
292
00:18:04,241 --> 00:18:06,103
TO FORM THE PERIMETER
OF ONE RIB.
293
00:18:06,206 --> 00:18:11,413
IN BETWEEN, HE GLUES SHORT
DIAGONAL STRIPS CALLED TRUSSES.
294
00:18:11,517 --> 00:18:14,344
HE REINFORCES BOTH SIDES
OF EACH INTERSECTION
295
00:18:14,448 --> 00:18:18,206
WITH A RECTANGULAR PIECE
CALLED A GUSSET.
296
00:18:18,310 --> 00:18:20,586
AN ASSEMBLER MOUNTS THE 15 RIBS
CROSSWISE
297
00:18:20,689 --> 00:18:23,103
ON THE FRONT AND REAR
WING SPARS,
298
00:18:23,206 --> 00:18:27,931
THEN INSTALLS THREE ALUMINUM
TUBES CALLED COMPRESSION RIBS.
299
00:18:28,034 --> 00:18:30,655
THESE ABSORB AIR LOAD
HITTING THE SPARS,
300
00:18:30,758 --> 00:18:34,034
KEEPING THE WOODEN RIBS
FROM FLEXING UNDER PRESSURE.
301
00:18:34,137 --> 00:18:36,172
THE CRAFTSMAN
CONNECTS THE COMPRESSION RIBS
302
00:18:36,275 --> 00:18:38,655
WITH CRISS-CROSSING METAL RODS.
303
00:18:40,344 --> 00:18:45,241
AFTER APPLYING MORE GLUE
TO CRITICAL AREAS,
304
00:18:45,344 --> 00:18:46,896
HE NAILS AN ALUMINUM TRIM
305
00:18:47,000 --> 00:18:50,448
OVER THE FRONT SPAR
AND NOSE OF THE RIBS.
306
00:18:50,551 --> 00:18:52,862
THIS IS CALLED THE LEADING EDGE.
307
00:18:52,965 --> 00:18:56,241
IT'S THE FIRST PART OF THE WING
TO HIT THE WIND,
308
00:18:56,344 --> 00:18:58,448
SO IT TAKES THE BRUNT
OF THE AIR LOAD.
309
00:19:00,310 --> 00:19:04,379
FINALLY, HE LACES REINFORCEMENT
TAPE THROUGH THE RIBS
310
00:19:04,482 --> 00:19:06,862
IN AN X PATTERN.
311
00:19:06,965 --> 00:19:10,482
THE COMPLETED STRUCTURE NOW
MOVES TO THE COVERING DEPARTMENT
312
00:19:10,586 --> 00:19:11,931
WHERE TECHNICIANS DRAPE IT
313
00:19:12,034 --> 00:19:14,931
IN HEAT SHRINKABLE
POLYESTER FABRIC.
314
00:19:15,034 --> 00:19:18,551
THEY CUT THE FABRIC TO SIZE,
GLUE IT TO THE WING PERIMETER,
315
00:19:18,655 --> 00:19:20,137
AND HEAT THE SURFACE
WITH AN IRON
316
00:19:20,241 --> 00:19:22,862
TO SHRINK THE FABRIC
UNTIL IT'S TAUT.
317
00:19:22,965 --> 00:19:26,793
THEN, THEY STITCH OVER THE GLUED
AREAS WITH POLYESTER CORD.
318
00:19:26,896 --> 00:19:28,931
THEY BRUSH ON A CHEMICAL
WHICH SEALS THE PORES
319
00:19:29,034 --> 00:19:30,586
OF THE FABRIC.
320
00:19:30,689 --> 00:19:33,448
THIS PRIMES THE SURFACE
TO RECEIVE A SPRAY COAT
321
00:19:33,551 --> 00:19:35,103
OF POLYURETHANE PAINT,
322
00:19:35,206 --> 00:19:38,724
WHICH IS A SPECIAL FORMULATION
DESIGNED FOR AIRCRAFT BODIES.
323
00:19:41,172 --> 00:19:43,620
TECHNICIANS CONSTRUCT
THE FUSELAGE FRAME
324
00:19:43,724 --> 00:19:47,206
OUT OF HIGH-STRENGTH
STEEL ALLOY TUBES.
325
00:19:47,310 --> 00:19:50,758
THEY USE AN ELECTRIC TORCH TO
SLIGHTLY MELT ADJOINING PIECES
326
00:19:50,862 --> 00:19:53,517
SO THEY FUSE TO EACH OTHER.
327
00:19:53,620 --> 00:19:56,517
BECAUSE THERE'S NO FILLER METAL
BONDING THE PIECES,
328
00:19:56,620 --> 00:19:59,379
THE WELDS DON'T ADD ANY WEIGHT
TO THE STRUCTURE.
329
00:20:02,172 --> 00:20:03,620
AFTER PAINTING THE FRAME,
330
00:20:03,724 --> 00:20:07,586
TECHNICIANS INSTALL ALUMINUM
FLOOR PANELS AND BULKHEADS.
331
00:20:07,689 --> 00:20:09,931
IN THE TAIL, THEY ADD
LIGHTER WEIGHT BULKHEADS
332
00:20:10,034 --> 00:20:14,206
MADE OF MAHOGANY PLYWOOD
AND SITKA SPRUCE.
333
00:20:14,310 --> 00:20:15,862
THEN IT'S TIME
TO BOLT THE ENGINE
334
00:20:15,965 --> 00:20:18,586
TO THE FRONT
OF THE FUSELAGE FRAME.
335
00:20:24,413 --> 00:20:26,275
THE ENGINE DRIVES A PROPELLER
336
00:20:26,379 --> 00:20:30,068
MADE OF EITHER WOOD, ALUMINUM,
OR A COMPOSITE MATERIAL.
337
00:20:30,172 --> 00:20:33,793
PAINTED ALUMINUM BODY PANELS
COVER THE FRAME.
338
00:20:33,896 --> 00:20:35,517
TECHNICIANS
INSTALL THE FUEL TANK
339
00:20:35,620 --> 00:20:38,793
BETWEEN THE FRONT COCKPIT
AND THE ENGINE.
340
00:20:38,896 --> 00:20:42,448
THEN THEY BOLT THE WINGS
TO THE FUSELAGE.
341
00:20:42,551 --> 00:20:44,931
VERTICAL STEEL STRUTS
CONNECT AND REINFORCE
342
00:20:45,034 --> 00:20:46,793
THE TWO LEVELS OF WINGS
343
00:20:46,896 --> 00:20:49,793
BOLTING TO THOSE ATTACHMENT
PLATES ON THE WING SPARS.
344
00:20:51,793 --> 00:20:55,241
NEXT, TECHNICIANS MOUNT
THE PAINTED ALUMINUM AILERONS,
345
00:20:55,344 --> 00:20:57,482
THE TAIL,
WITH ITS ELEVATORS AND RUDDER
346
00:20:57,586 --> 00:21:00,000
MADE OF PAINTED FABRIC
OVER WELDED STEEL,
347
00:21:00,103 --> 00:21:02,034
AND THEN THE ENGINE COVER.
348
00:21:02,137 --> 00:21:04,379
THEY INSTALL A WINDSCREEN
349
00:21:04,482 --> 00:21:06,793
AND INSTRUMENT PANEL
FOR EACH COCKPIT.
350
00:21:06,896 --> 00:21:10,482
THE FRONT SCREEN CAN BE REPLACED
WITH A COCKPIT COVER
351
00:21:10,586 --> 00:21:14,448
TO KEEP THE PILOTS WARM
WHEN FLYING IN COLD WEATHER.
28445
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