Firstly, I continued to search for projects similar to this that people had done and linked them to padlet. The closest one I found was a 600-gallon fish tank that has quite detailed instructions.

Made with Padlet

Dunk tank (1) (3D model)Click to open

Originally, I had planned to only have a single thick sheet of plywood for the sides of the dunk tank. However, after looking at wooden fish tanks and wooden bath pools, and realized that there were far better alternatives to my original design. With wooden ribs and a thin sheet of plywood, I can achieve the same effect for a lower cost. The cost of plywood goes up the thicker it gets, and long blocks of pine are fairly cheap and strong. Additionally, I have found out that the acrylic I have access to is not big enough to cover the entire front portion of the box, so I have decided to add a wooden brace to the middle and have 2 pieces of acrylic.

The dimensions of the tank: 1.2×1.2×1.4

*The supports on the outside of the tank will be parallel to the sides, instead of perpendicular as depicted in the diagram.*

I will use a locking clamp attached to the back of the tank as the mechanism to release the seat. There will be a metal, PVC or wooden rod that is next to the release lever of the clamp. When the target on the end of the rod is hit with a ball, the rod will then push against the release lever, opening the clamp and allowing the string holding the chair to get released. The person on the seat will then fall into the water. I may also have some netting in front of the tub so that the person who will be dunked is not in any danger.

My plan is to order all the materials I need next class, then work on the release mechanism and seat with the materials I currently have access to.

Material list:

wooden beams

Fiberglass sheets for reinforcement-fab lab

Epoxy (a lot)

Metal rod-just use PVC- fab lab

Netting (possibly)

Silicon sealant-fab lab

Wood screws-fab lab

Large sheets of plywood (There may be some at school)

Large sheets of acrylic-fab lab


I will start to work on the rest of the tank as the parts continue to arrive. I will first work on the seat and the release mechanism. As the clamp arrives, I will attach it to the rest of the release mechanism, allowing the release mechanism to function. As the plywood and wooden beams arrive, I will begin to cut and assemble them to make a box, then use epoxy and silicone sealant to waterproof the inside seams. After that, I will use fiberglass to reinforce the inside of the box, then put the clear acrylic pieces in the front.

4 Replies to “Plywood Dunk Tank Develop & Plan”

  1. I like how you added very specific details (such as measurements, materials) in your process of creating the dunk tank. I think you can add more sketches that show your dunk tank in different angles. Also, adding some pictures of your work along the process can help.

  2. Hi Minjun! I really like how you were really specific in adding materials, measurements and your brainstorming to the post. You seem to be quite prepared for the things you’ll face when you’re building the prototype. All I would suggest is maybe trying to make it easier to read in terms of fonts, text size, etc. as well as adding more photos of your process so it is easier to follow along with what you’re doing. Good job!

  3. Hi Minjun! I like how you included detailed information about the process of developing your plan. You also wrote down measurements and materials for your product which was really nice. Maybe you can consider uploading your visual sketches if you have any.

  4. Hi Minjun,

    Your 3D model is looking excellent! You have put a lot of time into planning your design, I am looking forward to seeing what you can create.

    Did you sketch out many different versions of your dunk tank idea? It would be good to see all the different shapes/styles you have been thinking of.

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