Difference between revisions of "Team Wharton A"

From ENGR005 2008
Jump to: navigation, search
 
(10 intermediate revisions by 2 users not shown)
Line 1: Line 1:
 +
[[Image:Profile_wharton1.jpg‎]]
 +
 
==Team members==
 
==Team members==
 
[[User:dcabre1 |Daniel Cabrera]]
 
[[User:dcabre1 |Daniel Cabrera]]
Line 11: Line 13:
  
 
==Brainstorming==
 
==Brainstorming==
We sat in a circle discussing our materials and what we could do with them to be both creative and effective.  We debated different possibilities, and everyone suggested any ideas that came to mind. Travis recorded the ideas as they came up.  As we discussed, we eventually came to a general consensus about our plan. We agreed to meet early the following Saturday morning to build.
+
We sat in a circle discussing our materials (3 Dowel rods, paper bag, tennis ball, trash bag, electrical tape and case, paper clip, 3 rubber band) and available tools (scissors and a ruler) and what we could do with them to be both creative and effective.  We debated different possibilities, and everyone suggested any ideas that came to mind, not discounting anything. Travis recorded the ideas as they came up.  As we discussed, we eventually came to a general consensus about our plan. We agreed to meet early the following Saturday morning to build.
  
 
===Ideas===
 
===Ideas===
Line 17: Line 19:
 
'''
 
'''
  
Create a flat surface with the greatest possible surface area
+
-Create a flat surface with the greatest possible surface area
  
Make it spin
+
-Make it spin
  
Cut dowel rods and tennis ball (into pieces)
+
-Cut dowel rods and tennis ball (into pieces)
  
Cut ball and stick paper clip in to use as a fish hook
+
-Cut ball and stick paper clip in to use as a fish hook
  
Cut rods and tape them together to make more than three
+
-Cut rods and tape them together to make more than three
  
Wings 0 cut bag on seams at an angle
+
-Wings - cut bag on seams at an angle
  
Place ball in bag
+
-Place ball in bag
  
Remove drawstring and use it for something else, stretch bag
+
-Remove drawstring and use it for something else, stretch bag
  
Impale ball and stick rods in
+
-Impale ball and stick rods in
  
 
==Choosing the Final Design and the Construction Process==
 
==Choosing the Final Design and the Construction Process==
  
 
First of all, we wanted to create the largest surface area possible in order to increase the air resistance on the trash bag, which would make it fall more slowly.  Thus, we decided to gather the tips of the sticks and generate the three equal parts of a circle by putting them 120 degrees apart.  (We also used the plastic tape’s cover to keep the sticks together.) We wanted to forestall having it behave like a parachute, because we thought that if it rotated, it could hang in the air for a longer amount of time. We considered cutting triangular wings by cutting the trash bag from the corners i.e. on its diagonal. To make it rotate, we decided to attach one side of the wing on the stick completely to prevent the air flow on that side. However, we only attached the tip of the wing to the tip of the stick and left space for air flow. According to the plan, if we built wings in this way air resistance will cause it to spin due to allowing only one direction of air flow.  In addition, we decided to cut the tennis ball into three equal parts to hang each part on three sticks so we could distribute the weight and prevent it from flipping.
 
First of all, we wanted to create the largest surface area possible in order to increase the air resistance on the trash bag, which would make it fall more slowly.  Thus, we decided to gather the tips of the sticks and generate the three equal parts of a circle by putting them 120 degrees apart.  (We also used the plastic tape’s cover to keep the sticks together.) We wanted to forestall having it behave like a parachute, because we thought that if it rotated, it could hang in the air for a longer amount of time. We considered cutting triangular wings by cutting the trash bag from the corners i.e. on its diagonal. To make it rotate, we decided to attach one side of the wing on the stick completely to prevent the air flow on that side. However, we only attached the tip of the wing to the tip of the stick and left space for air flow. According to the plan, if we built wings in this way air resistance will cause it to spin due to allowing only one direction of air flow.  In addition, we decided to cut the tennis ball into three equal parts to hang each part on three sticks so we could distribute the weight and prevent it from flipping.
 +
 +
[[Image:tbp.jpg]]
 +
 +
This was our basic design, only the tennis ball parts were actually placed closer to the center of the apparatus.
  
 
==Testing==
 
==Testing==
Line 43: Line 49:
  
 
==Final drop time==
 
==Final drop time==
Our final drop time off the second floor of Hicks was 3.91 seconds.
+
Our final drop time off the second floor of Hicks was 3.91 seconds (with a possible error of 0.2 seconds in either direction).
 +
 
 +
==Additional Remarks==
 +
The device did not spin as much as we would have liked. Perhaps in ideal conditions it would have done so.
  
 
----
 
----
  
 
Back to [[Ball Drop]] page.
 
Back to [[Ball Drop]] page.

Latest revision as of 15:43, 15 September 2008

Profile wharton1.jpg

Team members

Daniel Cabrera

Ozan Erturk

Jonathan Martin

Travis Pollen

David Saltzman

Brainstorming

We sat in a circle discussing our materials (3 Dowel rods, paper bag, tennis ball, trash bag, electrical tape and case, paper clip, 3 rubber band) and available tools (scissors and a ruler) and what we could do with them to be both creative and effective. We debated different possibilities, and everyone suggested any ideas that came to mind, not discounting anything. Travis recorded the ideas as they came up. As we discussed, we eventually came to a general consensus about our plan. We agreed to meet early the following Saturday morning to build.

Ideas

Here are the possibilities that we discussed:

-Create a flat surface with the greatest possible surface area

-Make it spin

-Cut dowel rods and tennis ball (into pieces)

-Cut ball and stick paper clip in to use as a fish hook

-Cut rods and tape them together to make more than three

-Wings - cut bag on seams at an angle

-Place ball in bag

-Remove drawstring and use it for something else, stretch bag

-Impale ball and stick rods in

Choosing the Final Design and the Construction Process

First of all, we wanted to create the largest surface area possible in order to increase the air resistance on the trash bag, which would make it fall more slowly. Thus, we decided to gather the tips of the sticks and generate the three equal parts of a circle by putting them 120 degrees apart. (We also used the plastic tape’s cover to keep the sticks together.) We wanted to forestall having it behave like a parachute, because we thought that if it rotated, it could hang in the air for a longer amount of time. We considered cutting triangular wings by cutting the trash bag from the corners i.e. on its diagonal. To make it rotate, we decided to attach one side of the wing on the stick completely to prevent the air flow on that side. However, we only attached the tip of the wing to the tip of the stick and left space for air flow. According to the plan, if we built wings in this way air resistance will cause it to spin due to allowing only one direction of air flow. In addition, we decided to cut the tennis ball into three equal parts to hang each part on three sticks so we could distribute the weight and prevent it from flipping.

Tbp.jpg

This was our basic design, only the tennis ball parts were actually placed closer to the center of the apparatus.

Testing

To test our design, we dropped it off the balcony of Alice Paul numerous times.

Final drop time

Our final drop time off the second floor of Hicks was 3.91 seconds (with a possible error of 0.2 seconds in either direction).

Additional Remarks

The device did not spin as much as we would have liked. Perhaps in ideal conditions it would have done so.


Back to Ball Drop page.