Orthographic

exploded iso

Plan of Procedures

1.) Cut ¾” PVC piping into four 12” long pieces, four 9” long pieces, and four 8” long pieces

2.) Insert one 12” PVC pipe and one 8” PVC pipe into each 90 degree PVC elbow. There should be four elbows with an 8” and 12” pipe in each; similar to the item in the picture below.

3.) Now position the Tee connectors onto the 12” PVC pipe. Two should go onto each 12” PVC pipe, in ¾” from each end of the pipe. This can be scene in the figure below

4.) Now use the other four 90 degree elbows to connect these four pieces together. This can be scene in the figure below. There should now be two of these parts complete

5.) Next insert a 9” PVC pipe into each of the openings on all eight Tee connectors. This should connect the two parts you have and finish the structure.

6.) Now, connect one propeller to the left, upper 12” inch PVC pipe using screws. Make sure that the propeller is facing up and away from the structure. Do the same for the upper, right 12” PVC pipe. This can be scene in the image below.

7.) Next, connect a propeller to outside of the left, rearward 8” PVC pipe. Then connect another propeller to the outside of the right, rearward 8” PVC pipe. This can be seen in the image below.
8.) Now, the frame and propulsion should be completely finished. It is now ready to have the robotic arm and tether attached to it.

Rendered Isometric

Calendar 2nd MP

Week of November 11th-17th

• 12th- Contact Mentor
• 13th- Log Update/Start Calendar
• 14th- Finish Calendar
• 15th- Participation/Schedule/Calendar and Log Sheet
  Orthographic Views w/Dimensions and Materials
• 16th- Log Update

Week of November 18th-24th

• 19th-Begin Exploded Drawing
• 20th-Log Update
• 21st-Continue Exploded Drawing
• 22nd-Finish Exploded Drawing
• 23rd-Log Update

Week of November 25th-December 1st

• 26th-Contact Mentor
• 27th-Log Update/Begin Rendered Isometric
• 28th-Continue Rendered Isometric
• 29th-Finish Rendered Isometric
• 30th-Log Update

Week of December 2nd-8th

• 3rd-Contact Mentor
• 4th-Log Update/Begin Plan of Procedures
• 5th-Continue POP
• 6th-Finish POP
• 7th-Log Update

Week of December 9th-15th

• 10th-Contact Mentor
• 11th-Log Update/Begin Bid Process
• 12th-Continue Bid Process
• 13th-Finish Bid Process
• 14th-Log Update

Week of December 16th-22nd

• 17th-Contact Mentor
• 18th-Log Update
• 19th-Developmental Work and Bid Process Due
• 20th-Begin Math and Science Analysis
• 21st-Log Update

Week of December 23rd-29th

• 24th-No School
• 25th-No School
• 26th-No School
• 27th-No School
• 28th-No School

Week of December 30th-January 5th

• 31st-No School
• 1st-No School
• 2nd-Contact Mentor
• 3rd-Continue Math and Science Analysis
• 4th-Log Update/Finish Math and Science Analysis

Week of January 6th-12th

• 7th-Contact Mentor
• 8th-Log Update
• 9th-Create Outline For Presentation
• 10th-Math and Science Analysis Due
• 11th-Log Update

Week of January 13th-19th

• 14th-Contact Mentor
• 15th-Log Update
• 16th-Prepare for Presentations
• 17th-Presentations
• 18th-Log Update/ Presentations

Week of January 20th-26th

• 21st-Presentations
• 22nd-Log Update
• 23rd-Mentor Contacts Due
• 24th-Begin 3rd Marking Period Calendar
• 25th-Log Update
  

Selection/Rejection

I have designed three alternate solutions for the structure and propulsion of an underwater ROV designed to be operated by a team of three. For each solution there is a brief description, along with a list of pros and cons. Each design description will incorporate the propulsion and structure together, for the two go hand in hand.

The first solution is rather simple in nature. The structure is made up of 1” PVC piping. There are two propellers placed internally in the rear of the structure to propell the ROV forward. These also function to steer the ROV to the left or right without using a rudder system. Centered externally on each side of the structure, is a propeller facing up and down. These will aid in the surfacing and submerging of the ROV. The propellers will be those used on the previous year’s ROV.

This solution seems very pratical. The resources necessary are easily available to me and my teammates. Also, the design should be able to perform all the tasks necessary to complete the competition requirements. I like how the inside of the structure is left open to include the robotic arm, lights, video cameras, and anything else necessary for the ROV.

Pros

• The PVC structure will be postively buoyant which is good because it is easier to add weight for buoyancy than to take away weight.


• Able to surface and submerge without needing to move forward.


• Two upward propellers will keep ROV balanced during ascent or decent
  

Cons

• Requires a lot of power to steer the ROV.


• Taking turns slows the ROV due to opposing motion of one propeller.


• Structure may be too positively buoyant.

The second solution is very similar to the first. The structure is also constructed of 1” PVC piping. The structure resembles the skeletal nature of a rectangular prism. Two propellers are used to ascend and descend the underwater ROV. One is located in the bow of the ROV, and the other is located on the stern to ensure that the ROV does not lean back or forth during surfacing. The two propellers located externally on the stern of the ROV are used to propell the ROV forward and rearward. These propellers also function to turn the ROV left and right.

This solution is also very practical to make. It requires the same resources as the first solution. Also, there is no major expertise in certain tools or materials necessary for this design. The only concern I have about this design is that the propeller placed in the front may interfere with the robotic arm, which is also placed in the front of the ROV.

Pros

• Capable to ascend and descend without needing to move forward


• Is light weight and will not require a lot of power to move


• PVC structure will be positively buoyant

Cons

• Requires a lot of power to turn the ROV left and right


• Little space in front for robotic arm, lights, and video cameras


• Turning cause the ROV to slow down
  

The third design is the most complex of the three. This design can be most easily compared to an airplane. On the top are two wings extending over the side. These would be made out of some kind of plastic, such as plexiglass. Under each wing is a propeller to move the ROV back and forth. At the rear of each with is a diving place. These curve up to make the ROV surface and curve down to make it submerge. All the way in the rear of the design is a rudder. This is placed in between the propellers to move the ROV left and right. The bottom is a PVC box which will contain the robotic arm, video cameras, etc.

This solution is rather complex and would be quite difficult to produce. By using the diving planes, the ROV is forced to move forward during surfacing and submerging. Also, since the ROV is so complex then there are more potential problems that I will run into during the production. If something were to happen with the rudder, then the propellers can act as the steering if necessary.

Pros

• Can surface and submerge while moving forward.


• Has less propellers so it uses less power

Cons

• More complex means more problems


• Is heavy and may be negatively buoyant


• Cannot surface when stationary

After looking over the pros and cons of each design, I decided that the first solution seems to be the most practical. However, i felt there was not enough torque to turn the ROV left and right. So i decided to do a combination of the first and second design. The final solution will be the first design, only with the rear propellers located outside the ROV rather than inside

Alternative Solutions

The first solution is rather simple in nature. The structure is made up of 1½” PVC piping. There are two propellers placed internally in the rear of the structure to propell the ROV forward. These also function to steer the ROV to the left or right without using a rudder system. Centered externally on each side of the structure, is a propeller facing up and down. These will aid in the surfacing and submerging of the ROV. The propellers will be those used on the previous year’s ROV.


The second solution is very similar to the first. The structure is also constructed of 1½” PVC piping. The structure resembles the skeletal nature of a rectangular prism. Two propellers are used to ascend and descend the underwater ROV. One is located in the bow of the ROV, and the other is located on the stern to ensure that the ROV does not lean back or forth during surfacing. The two propellers located externally on the stern of the ROV are used to propell the ROV forward and rearward. These propellers also function to turn the ROV left and right.

The third design is the most complex of the three. This design can be most easily compared to an airplane. On the top are two wings extending over the side. These would be made out of some kind of plastic, such as plexiglass. Under each wing is a propeller to move the ROV back and forth. At the rear of each with is a diving place. These curve up to make the ROV surface and curve down to make it submerge. All the way in the rear of the design is a rudder. This is placed in between the propellers to move the ROV left and right. The bottom is a PVC box which will contain the robotic arm, video cameras, etc.