SCO: Egg Scrambler Design 39 Campus

Egg Scrambler Kick off Introductions Expectations Milestones 2 hour class every Sunday at coach’s residence , attendance will be taken as per D39 SO Olympiad rules Will need to look into possibility of moving to school once building is done , for testing and calibrating the devices 1 binder/notebook to take class notes No devices (phones ok as long as its to contact parents) Follow class rules , 2 per team - coach will make final team decision Milestones Familiarize oneself with Egg Scrambler rules ( Very important) Build Egg Transport Vehicle Build Launching mechanism Egg Rest/Holder Test & Calibrate

Or What is Egg Scrambler ? NOTE: To change images on this slide, select a picture and delete it. Then click the Insert Picture icon in the placeholder to insert your own image. Or What is Egg Scrambler ?

Egg Scrambler Description : Prior to the competition, one must design, build and test one mechanical device which uses the energy from a falling mass to transport an egg along a track as quickly as possible and close to the center of a terminal barrier without breaking the egg

What does this mean? YES  NO 

Let’s take a look at some successful runs https://www.youtube.com/watch?v=1otixB_nz5U https://www.youtube.com/watch?v=Jt-I3mKhzxk https://www.youtube.com/watch?v=Is4TGPx89KE https://www.youtube.com/watch?v=0swfsN-M7Qo https://www.youtube.com/watch?v=nUAHhSuBArI&index=14&list=PLF92E22A6C14 CDC7F

Now the unlucky ones http://www.tubechop.com/watch/6858653 https://www.youtube.com/watch?v=-asBZI8jW3Y https://www.youtube.com/watch?v=k0XmckjFXrQ

Construction Rules The Scrambler must consist of an Egg Transport vehicle (ETV) and an Energy Propulsion System These may be separate or combined into 1 unit The ETV may not contribute to or be part of the falling mass -> what does this mean what does it mean : http://www.tubechop.com/watch/6858942 The entire Scrambler including the egg must not exceed 0.90m in any dimension ( 0.90m = 2 feet & 11 inches) Should start with an unsharpened #2 pencil with unused eraser No electricity or electronics Egg provided at the event Foremost part of vehicle Taped to the vehicle, no tape in front 1cm of egg Back of egg should touch the backstop

‘16 8.5m Scrambler 2016 Minimum distance (8.5m) 0.5 m 9.00 m to 12.00 m 1.00 m interval : Regionals 0.25 m interval : State 0.10 m interval : National 0.5 m 8.5m Scrambler 2016

Energy Propulsion System

ETV Launcher 1: Hammer Launcher

Hammer Launcher Pros High theoretical efficiency Very easy to build Cons High dependence on mass used Theoretical efficiency is difficult to achieve, due to the non-truly elastic collisions The rapid acceleration is stressful on the car, requiring it to be sturdy There is a chance that (due to the force of impact), the yolk of the egg is ejected from the shell at the moment of impact

ETV Launcher 2 : Pulley Launcher

Pulley Launcher Pros Good theoretical efficiency Easy to achieve theoretical efficiency Simple construction Cons Some dependence on mass used

ETV Launcher 3 : Spring Launcher

Spring Launcher Pros Nearly maximum theoretical efficiency possible in a scrambler Reasonably easy to achieve the theoretical performance Low dependence on mass used Cons The locking mechanisms are often difficult to build Complexity of the device requires careful construction Rapid speed of the car makes it difficult to stop

Egg Transport Vehicle

The Egg Transport Vehicle (ETV) Wheel and Axle Straight Sturdy Traction

ETV Rules Read the rules for the ETV constraints The egg transport device (the vehicle) will be designed to launch from a launching device, and coast across the track to the terminal barrier. The vehicle must be capable of stopping on its own. The distance it runs before stopping must be adjustable and self‐activating. Students must learn to set the distance accurately for each possible target distance at a given competition. The egg will be the foremost object on the vehicle. If the vehicle hits the wall, the egg must absorb the impact. No cushioning may be used to mitigate the impact effect. The vehicle should run a consistent and predictable path. Students will learn to aim the vehicle at the center of the terminal barrier by adjusting the launcher, the vehicle, or simply by repetition. Students will have limited time – 8 minutes – to set up and run two runs. This should also be practiced.

ETV considerations Type of wheels used & friction Size of wheels used Rubber Wood Plastic Size of wheels used Do all the wheels need to be of the same size? 2 wheeled vs 3 wheeled vs 4 wheeled ETV’s Advantages/Disadvantages of having lesser vs more wheels

Braking System

Braking Why do we need braking ? The stopping mechanism must be contained completely within the ETV and must work automatically. The ETV must not be remotely controlled or tethered Examples https://www.youtube.com/watch?v=RJwFtkFSuJM : (wingnut) String wrapped around wheel Spring brakes Mass falling/resting on floor (Not allowed)

Egg Rest

‘16 Rigid, unpadded and completely filled – no unfilled holes No nails visible on this face 4 cm

Important Links http://scioly.org/wiki/index.php/Scrambler https://www.youtube.com/watch?v=m1GTUz5kED4

HW Think about a design and sketch it out for next class We need raw materials to experiment with. So look around your house and see if you can find unused Wheels Pulleys Strings Wood/Aluminum roads