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2009 2010 New York State Science Olympiad Pilot Event

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... flights will be permitted in the last half-hour of the event. ... If you break the helicopter on the first official attempt, the 8-minute timer does not stop. ... – PowerPoint PPT presentation

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Title: 2009 2010 New York State Science Olympiad Pilot Event


1
2009 - 2010 New York State Science Olympiad Pilot
Event
  • Helicopter Duration

2
Helicopter Duration
  • 1. DESCRIPTION
  • 2. CONSTRUCTION SPECIFICATIONS
  • 3. THE COMPETITION
  • 4. SCORING
  • National Science Education Standard
  • http//www.soinc.org/events/wrightstuff
  • State Event Is Sponsored By
  • The Empire State Chapter of the American
    Helicopter Society International
    http//www.NYVTOL.org

3
1. DESCRIPTION
  • Teams of one or two persons will
  • construct and test
  • free flight rubber-powered helicopters
  • to achieve maximum flight times.

4
2. CONSTRUCTION SPECIFICATIONS
  • a. DESIGN
  • b. MATERIALS
  • c. MASS
  • d. ROTORS
  • e. CONSTRUCTION
  • f. TRANSMISSION
  • g. POWER
  • h. MARKING

5
2.a. DESIGN
  • Helicopters may be constructed from
  • Published plan(s) OK
  • Commercial kits OK
  • Students Original Design OK
  • NO LIMITATION Wide Open

NOTE See also 2.e. Construction. Commercially
available rotors or propellers shall not be used.
6
2.b. MATERIALS
  • What about ?
  • Metal
  • Fiberglass
  • carbon fiber
  • other composites
  • scotch tape
  • JB Weld
  • roller bearings
  • plastic bushings, etc..
  • Construct ONLY from
  • wood
  • paper
  • plastic film covering
  • Glue
  • Components May be attached using
  • thread
  • music wire
  • malleable wire
  • paper or plastic tubes
  • rubber bands
  • May use
  • Plastic or rubber o-rings to attach the motor to
    the helicopter rotor(s)
  • May NOT use
  • Pre-glued joints
  • Pre-covered surfaces

See also 2.e. Construction
Refers to Commercial Kits
7
2.c. MASS
  • Total mass of the helicopter throughout the
    flight, excluding the rubber motor, must be 5.0
    grams or more.
  • 5.0 grams or more at all times
  • (Excluding Rubber Motor)

8
2.d. ROTORS
  • Rotors surfaces that contribute lift by
    rotating around a vertical axis.
  • Use up to three fixed pitch rotors.
  • 30.0 cm Max Rotor diameter
  • No maximum number of Rotor Blades
  • No maximum Rotor Blade Chord
  • No other lifting surfaces are permitted.

9
2.d. ROTORS (Continued)
Hub
Rotors require power to spin the blades, develop
thrust and to overcome blade drag.
Thrust
Drag
Blade
10
2.d. ROTORS (Continued)
  • Hub Center of rotation, used to attach Rotor
    Blades
  • Rotor Blades Primary lifting agent in Rotor
    using airfoil cross section and rotational
    velocity to generate Lift
  • Lift (coefficient of lift)(Q)(S)
  • (coefficient of lift) An expression of how well
    an airfoil produces Bernoullian lift
  • (Q) ½ Rho (Density Ratio) times the square of
    the velocity of the relative wind
  • (S) The surface area of the airfoil
  • Angle of Attack Relation between Blade Cross
    Section and Airflow, used to determine
    coefficient of lift
  • Thrust sum of Lift from Rotor Blades

11
2.d. ROTORS (Continued)
  • Fixed Pitch Each blade installed in Hub at set
    Angle of Attack (AoA), Thrust is varied by
    rotational speed, not control of AoA
  • Rotor Radius Distance from center of Hub to tip
    of Rotor Blades
  • Rotor Blade Chord Distance from Leading Edge of
    Rotor Blade to Trailing Edge
  • Blade Cross Section Airfoil shape used to
    generate lift

Chord
12
2.e. CONSTRUCTION
  • Students shall construct the rotors themselves.
  • Commercially available rotors or propellers shall
    not be used.
  • (Building/Designing the rotors is the single
    biggest challenge of this event)
  • Bearings, rotor thrust bearings may be
    commercially available items.

Seems to contradict 2.a. Design 2.b. Materials
13
2.f. TRANSMISSION
  • Between Rubber Motor and the Rotors
  • No gears
  • No pulleys
  • No rollers
  • No means of changing mechanical advantage

Rotor Thrust Bearings are allowed by 2.e.
Construction Roller Bearing type Rotor Thrust
Bearings are OK !
14
2.g. POWER
  • The helicopter will be powered by rubber motor(s)
    not exceeding a total mass of 2.0 grams
    (including any attachments such as o-rings).
  • The motor(s) will be massed separately from the
    helicopter.
  • Motors may be lubricated before and/or after
    check-in. (lube has weight)
  • Motors will be massed at check-in, and officials
    will clearly mark and impound qualified motors,
    which will be made available to the team for
    official flights.

15
2.h. MARKING
  • Each helicopter must be labeled in such a way as
    to be easily identified by the event supervisor.

16
3. THE COMPETITION
  • FLYING SPACE
  • SPORTSMANSHIP
  • FLIGHT LOGS
  • PRACTICE FLIGHTS
  • (self-check inspection)
  • (Motor Winder)
  • CHECK IN and PREPARATION
  • FLIGHTS
  • (Flight Period - 8 minutes)
  • MOTORS
  • TIMING
  • CONCURRENT FLIGHTS
  • STEERING

17
3.a. FLYING SPACE
  • The event must be held indoors.
  • The room dimensions shall be made available to
    teams in advance of the competition. (approximate
    length, width and ceiling height)
  • Directors and supervisors are urged to minimize
    the effects of environmental factors such as air
    currents (e.g., doors, fans) by pre-arranging for
    ventilation to be turned off, windows to remain
    closed, and doors to be kept closed during
    flights.

18
3.b. SPORTSMANSHIP
  • No persons may attempt to give teams outside
    assistance, materials or communication, once
    teams enter the flight room on the day(s) of
    Helicopter Duration competition,
  • This applies to any trim periods as well as
    during the official flying schedule.
  • Teams violating this rule will be disqualified.
  • Competitors may offer assistance to other teams.
  • A separate area will be designated for
    spectators, who may not interact with the teams
    except with encouragement.

19
3.c. FLIGHT LOGS
  • Each team must present flight log of recorded
    data during inspection.
  • Data will include at least 6 parameters for at
    least ten test flights prior to the competition.
  • The three required parameters to be recorded are
  • motor size before windup,
  • number of turns on the motor at launch,
  • flight time.
  • The team must choose 3 additional data
    parameters. for example, turns remaining after
    landing, estimated/recorded peak flight height,
    estimated flight path diameter, the torque at
    launch, etc.
  • Flight Logs are returned to the team members
    after inspection.

See also 3.g. Check-in Preparation
20
3.d. PRACTICE FLIGHTS
  • At the Event Supervisors discretion, practice
    flights may occur throughout the event but will
    yield to any official flight.
  • Multiple practice flights may occur at the same
    time.
  • No trim (practice) flights will be permitted in
    the last half-hour of the event.

21
3.e. SELF CHECK INSPECTION
  • A self-check inspection station may be made
    available to competitors for checking their
    helicopters prior to being checked by the judges.

22
3.f. MOTOR WINDER
  • The use of any type of motor winder is permitted.

23
3.g. CHECK-IN PREPARATION
  • Inspection for each team will take place 15
    minutes prior to that teams 2 official flights.
  • Team members will present their event materials
    during their inspection.
  • (at most TWO helicopters, any number of motors,
    and flight log)
  • The official timer will dispense each teams
    approved motors during said teams official
    flights. (lube the rubber-band just before
    winding)
  • Timers will be assigned to accompany and observe
    teams as they prepare for flight, wind their
    motors and fly.

24
3.h. FLIGHTS
  • Teams may make up to a total of 2 official
    flights using one or two helicopters.
  • If you break the helicopter on the first official
    attempt, the 8-minute timer does not stop.
    Having a second helicopter would be a very good
    thing. Expect to break the helicopter on every
    flight.

25
3.i. FLIGHT PERIOD 8 MINUTES
  • Teams will be given an 8 minute "Flight Period",
    starting when their first official flight begins,
    to launch their official flights.
  • Any flight beginning within the 8-minute period
    will be permitted to fly to completion.
  • Participants may make adjustments/repairs/trim
    flights during their official 8-minute period.
  • Teams must declare before any launches during
    their 8-minute flight period as whether it is an
    official flight or trim flight.
  • Teams will not be given extra time to recover or
    to repair their helicopter(s).(Another reason why
    having 2 helicopters would be a good thing)

26
3.j. MOTORS
  • The official timer will allow the team members to
    select a motor for each official flight from
    their approved motors.

NOTE If a motor is broken while winding,
selecting another motor will be acceptable. This
assumes that you brought and qualified more than
the minimum number of motors for two official
flights. Breaking several motors is NOT unheard
of.
27
3.k. TIMING
  • The judges will measure and record the "Time
    Aloft" to the nearest tenth of a second for each
    flight.
  • Time Aloft for each flight starts when the
    helicopter leaves the students hand and will
    stop when any part of the helicopter touches the
    floor or is arrested on or in any object, or when
    the judges have determined the flight has ended.

28
3.l. CONCURRENT FLIGHTS
  • The Event Supervisor may permit other official
    flights during the flight of another teams
    helicopter once the prior helicopter has started
    its descent.
  • In the unlikely event of a collision with another
    helicopter, teams may elect to re-fly that
    flight.
  • The decision to re-fly may be made after the
    helicopter lands.
  • Re-flights shall not be limited by the 8-minute
    flight envelope. (Key point)

29
3.m. STEERING
  • Steering the helicopter during flight is
    prohibited.

30
4. SCORING
  • Bonus
  • Incomplete flight logs
  • Missing flight logs
  • Rules Violations

31
4.a. BONUS SCORING
  • State Competitions
  • 25 of the flight time will be added if the
    helicopter uses only two rotors.
  • National Competition
  • 50 of the flight time will be added if the
    helicopter uses only one rotor.

32
4.b. ANTI-BONUS SCORING
  • Incomplete flight logs
  • 10 of their flight time deducted from each
    flight.
  • Missing flight logs
  • 30 of their flight time deducted from each
    flight.
  • Rules Violations
  • Teams with rule violations that do not have a
    specific penalty will be ranked after all teams
    that do not violate those rules.

33
  • Back Up

34
Contact Information
  • Nathan Meehan
  • Student Affairs/Scholarship Chair
  • Empire State Chapter, AHS International
  • nathan.meehan_at_lmco.com
  • 607-751-1937
  • David Marcus
  • Head of Rotor Design
  • Marcus.David_at_sacusa.com
  • 607-378-4769
  • Clark W. Smith
  • clark.smith_at_lmco.com
  • 607-751-2234
  • Treasurer, Empire State Chapter, AHS
    International
  •  http//www.nyvtol.org/
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