wright stuff. agenda introduction aircraft terminology theory of flight glider details hints...
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WRIGHT STUFF
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AGENDA
• INTRODUCTION• AIRCRAFT TERMINOLOGY• THEORY OF FLIGHT• GLIDER DETAILS• HINTS• EXTRA--STARTING PLANS
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DAVE BRAUNSTEIN
• ACADEMIC COORDINATOR—MESA CSULB
• 35 YRS CHEM. ENG. R&D • 12 YRS CHEM/MESA LBUSD
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OBJECTIVE
• TO DESIGN AND CONSTRUCT A BALSAWOOD GLIDER THAT WILL HAVE THE LONGEST FLIGHT TIME WHEN LAUNCHED FROM A HAND HELD CATAPULT.
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MATERIALS
• BALSAWOOD.• GLUE – ANY TYPE. • MODELING CLAY.• PAINT, STICKERS, INK, AND MARKERS
MAY BE USED FOR DECO OR ID.
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RULES
• NO READY MADE KITS.• GLIDER WITH CLAY BALLAST • 1:1 DRAWING WITH ISOMETRIC AND
PLAN VIEWS- CAD AND HAND DRAWN PERMITTED
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RULES- (CONT’D)
• NOSE HOOK FOR LAUNCHING A MUST.
• CATAPAULT WILL BE PROVIDED • LAUNCH RELEASE Ht=6 ft. max• 3 LAUNCHES- 2 BEST COUNTED
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4 FORCES OF FLIGHT
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AXIS OF ROTATION
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FLIGHT THEORY
• Newton’s 3 laws of Motion• Inertia• F=ma• Action=Reaction• Bernoulli’s Law of fluid flow (1730’s)• K= ½ mv2 + PV + mgh• K= ½ v2 + P + gh =
density
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K=v2 + P + gh
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ANGLE OF INCIDENCE
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ANGLE OF ATTACK
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DIHEDRALS
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WHY DIHEDRALS?
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WING VORTEX
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SOLUTION
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GLIDER TAIL
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TAIL FUNCTION
• HORIZONTAL STABILIZER-CONTROL PITCH- NOSE UP/NOSE DOWN
• VERTICAL STABILIZER- CONTROL YAW- LEFT/RIGHT
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STABILIZER SIZES
• OUTDOORS-• HORIZONTAL-1/5 AREA OF WING• VERTICAL-1/3 TO 1/2 OF HORIZONTAL
• INDOORS-• HORIZONTAL-1/6 TO 1/8 WING AREA• VERTICAL- 1/3 TO ½ OF HORIZONTAL
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HINTS
• NO SQUARE EDGES.• STABILIZERS SMALL BUT NOT TO THE
POINT OF INSTABILITY• CENTER OF GRAVITY OF FINISHED
GLIDER IS 1/3 TO ½ FROM THE FRONT EDGE OF THE WING.
• TAPERED BOOM.• OUTDOORS USE GLIDERS HEAVIER
THAN 10 GRAMS.
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MORE HINTS
• FUSELAGE LENGTH EQUAL TO OR SLIGHTLY LONGER THAN WINGSPAN
• WING LOADING RATIO= GLIDER WEIGHT/WING AREA LOWER IS BETTER.
• GLIDE RATIO= DIST./SINK RATE• CIRCULAR FLIGHT PATTERN • USE ‘TOOLS’ and ‘JIGS AND
FIXTURES’ FOR DIHEDRALS, ETC.
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FLIGHT PATH
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TROUBLE SHOOTING
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MORE TS