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EN115 Engineering Concepts

ITEM

POINTS

Weekly attendance logs at 2 points per day

Final WM

15

Data sheets and/or graphs

10

PVC Trebuchet

15

List of parts purchased and cost

5

Goal: Hit a wall ~ 2 ft by 2 ft placed at 30 to 50 feet from the front edge of your trebuchet.

Note: Once the rounds begin, no practice throws are allowed! Teams will take turns through each round.

* Round 1; 1st throw - attempt to hit target - no bounces count!

** Round 2; 2nd and 3rd throws - attempt to hit target; adjustment is allowed before the 2nd throw

*** Round 3; 4th and 5th throws for maximum distance; an adjustment is allowed for each throw. (no practices)

Scoresheet:

Objective

Details

Data

Score

Bonus

ACCURACY

* Distance from base -> 1st throw (0 if hit)




one allowed adjustment

** Distance from base -> 2nd throw (0 if hit)




no further adjustment allowed

** Distance from base -> 3rd throw (0 if hit)




ACCURACY
Hitting target

15 points; Hit any part, error=0
Closest 1st throw +2
Hit all 3 times +6

5(target distance - error) / (target distance)




5(target distance - error) / (target distance)




5(target distance - error) / (target distance)




ACCURACY
Trebuchet vs WM

10 points;
+2 for closest

Mass or other variable used for 1st throw




Difference between WM and actual distance - 1st throw
(I will put this mass into your WM to score. )
Top team =10+2; teams 2nd,3rd =10; teams 4th;5th =8;..



PRECISION
5 points; (farthest - shortest)

Difference < 2 ft = 5; < 4 ft = 4; < 6 ft = 3; ..




BRUTE FORCE ->longest +2

*** Maximum throw length (2 tries) (feet)




EFFICIENCY

Mass of trebuchet (with counterwt) (grams)




Height + Width of your trebuchet (cm)




EFFICIENCY weight->best +2

Ratio = (farthest throw) / (mass)




EFFICIENCY size-> best +2

Ratio = (farthest throw) / (Ht + Width)




CREATIVENESS
10
points; ingenious +1to+3

Creativity, Uniqueness, Workmanship - both pvc and WM (appear, geom, prop)

As judged by the King



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