2. Introduction (Mousetrap)

Group Members:
AFIQ PRASANTO (6) S3-07
TOH YONG JIANG (24) S3-07
TRAN HOANG MINH S3-07
NG JUN HAO ELGIN S3-06

Engineering Design Process


Assignment of roles

Project Manager - Elgin
- Responsible for all documentation and "care" of the mousetrap.
- Ensures that all tasks are completed and documented on time.
- Has final say on any issue that cannot be settled by consensus.

Drivetrain Engineer - Afiq
- Responsible for developing system to transfer energy from the 'engine' to the wheels.
- Ensures proper testing and documentation of all drivetrain components.

Wheel Engineer - Yong Jiang
- Responsible for wheel choice and design.
- Sources materials for wheels.
- Works with Drivetrain Engineer to determine wheel-to-axel ratio and attachment.

Chassis Engineer - Minh
- Responsible for the look and function of the body (chassis) of the car.
- Sources all materials for the chassis
- Works with Drivetrain and Wheel Engineers to ensure function and look of wheels and drivetrain components.

Competition Details

A. Rules & Regulations
Teams will design and build their own vehicles which must be solely powered by the
standard issue mousetrap. Competition rules are as follows:
  1.  The standard issue mousetrap must be mounted onto the vehicle chassis.
  2.  The spring on the mousetrap may not be cut, bent, over- wound, heat-treated or altered in any manner.
  3.  No additional source of elastic potential energy should be incorporated into the engine/drivetrain mechanism. 
  4. Additional input of energy of any form to the vehicle is forbidden. 
  5. Participants may supply their own materials and are encouraged to use recycled, re-purposed materials; kits are prohibited.
  6. Distance traveled will be measured in a straight line, with reference to the front axle of vehicle from start point to the point where the front axle stops or leaves the designated testing area.
  7. Vehicles must have either 3 or 4 wheels. 
  8. Engineering modifications such as gearing, use of lubricants, bushings and bearings are permitted.
  9. The final assessment will consist of a maximum of 3 trial runs out of which the run with the best score will be recorded; the vehicle cannot be modified further once it has started on the first trial run and all 3 runs must be conducted within the same day. 
  Exception: Minor adjustments that are approved by the teacher assessor may be allowed on a case-by-case basis; all adjustments approved and carried out must be documented by the respective teams.

B. Final Assessment
Scoring in the final assessment will be based on (i) maximum distance travelled in a straight line and (ii) vehicle run time (from start to stop of motion). 
Calculation of the total score will follow the following mathematical formula:

Total Score = 70 – 10p + 2d – 2(t – 1)

- Maximum score 100 pts
- Number of rule violations p (min: 0 pts)
- Each 0.5 meters travelled (up to 8 meters) d (max: 15 pts)
- Run time in seconds (at least 1 second) t (min: 1 pt)
  Example: Team A’s mousetrap car travelled a straight line distance of 4.0 m in 2.0 s, and they
have 1 rule violation. Their total score = 70 – (10 x 1) + 2 x (4.0 / 0.5) – 2(2.0 – 1) = 74

- To get a maximum score of 100, a team needs to get a straight distance of at least 7.5 m in a
time of 1.0 s and have zero rule violation.

- If the team does not have a working mousetrap car on the day of final assessment (e.g. the
vehicle fails to move on launch or the vehicle is not completed or missing), there will be a
penalty of – 50 (i.e. the team will score 70 – 50 = 20).

Leave a Reply