Engineering 102 - Section 002 (Dr. D. Birnie)
Tractor Pull Results - March 1999
 
Score for best run of three trials made by each team:
Team Number Weight Lifted (N) Number of Rubber Bands Distance Traveled (cm) Performance Index
2
2.2
1
113
248.6
5
2.2
1
83
182.6
3
2.2
1
82
180.4
7
2.2
1
69
151.8
6
3.3
1
46
151.8
1
1.1
1
116
127.6
4
2.2
1
54
118.8
8
2.2
3
142
104.1
Photo details

Team 1
General picture of car --- Bricks for weight.
Close up inside --- Notice string around axle and that rubberband is doubled over.
With report graphic of real tractor --- Notice peg for other end of rubberband.
Front view --- better view of RB connection.

Team 2
General picture of car --- notice large weights attached to axle.
Car with post in place --- rubber band was  stretched up to the top from string around axle.
Close up of car top --- showing how extra weight could be added to car.
Close up of axle weight --- providing better traction without adding friction to rear bearing!

Team 3
General picture of car --- notice larger diameter spool where rubberband was wound.
Close up of front --- with movable crosspiece to allow winding the rubberband.
Front of car --- with crosspiece in front-most position.
Vertical beam --- finger indicates where cable was attached (this had to be braced with wire).

Team 4
General picture of car --- brick in place to provide traction to rear wheels.
Close up of front --- showing adjustable position for dowel defining rubber band length.
Close up of rear axle --- showing larger diameter reel to adjust torque.
Rear axle and wheels --- not as close.

Team 5
Close up of drive axle --- notice cone where rubber band was wrapped. Extra torque at end!
Whole car from below
Detail of front end --- bar pulls free to stretch rubberband.

Team 6
General picture of car --- swept back fins for aerodynamic style!
Close up of cockpit --- Who is driving?
"Ray gun at front" --- No Tailgating!
Close up of RB use --- tripled over and attached to string.
Under side --- showing placement of rubberband/string.

Team 7
Front end --- with a weight as "driver".
Whole car --- view from front.
Rear axle --- larger radius spool fashioned from two small wheels from kit.
Front end --- another view with pencil as brace for rubberband.

Team 8
Under side view --- this car had 4-wheel drive!
Under side view --- another angle.
Close up of front axle --- both axles similarly configured.
 

(c) 1999, by Dunbar P. Birnie, III