鱼雷形3D模型

Torpedo Toy - (75%Toypedo)

2023-07-22 11:10:47

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Summary

One of my smaller nephews had issues getting the standard issue toypedo to work for him, so I made some scale versions instead. (full size here)

When filled, they have about 5-6% negative buoyancy, so they will eventually sink. You need to submerge the torpedoes underwater, and hold them while the air bubbles out so that they are totally flooded.

Currently their maximum range is about 4m, though I think a light coat of plasti-dip might improve performance. Honestly, I kind of prefer that they stall and sink like they do now: easier to catch!

First version works better than Rev 1, Rev 2 is a marriage of both worlds and is currently untested.

Check out my other cool project here, for cool cups, mugs, & more: WeCanDrinkTogether.com. Yes, it has some free stuff, lol.

Update - Rev 2

Rev 2 works really well at 0.16mm layer thickness!

Update - Rev 3

Rev 3 is alright, might not be better than Rev 2.

Review

In reviewing the "quickie" buoyancy spreadsheet.... All I can say is "What was I on?!" It's got all the details you need to do the buoyancy, but I can tell I wasn't really paying attention when I did it.... Approach with caution, lol.

Drawings posted!

I put up the drawings in soliddraw, png, and PDF.
Not exactly what you need for a full-redo, but it does show all the critical dimensions: perfect for Fluid Dynamics/Physics education!

Standards

NGSS CCSS

Overview and Background

Understanding Principles of Fluid Motion & Flight

The different torpedoes have different centres of mass, some have different numbers of fins, different twist, and importantly, also a different angle of taper! In noncompressible water flow (most water flow), 7.5deg of inward-angling surface is all you can get before flow separation--but rougher surfaces will perform more poorly! So, at the flat rear of the torpedo the flow separation is very high, and some designs have much less drag than others. The centre of mass also makes a big difference causing some torpedoes to pitch upward while spinning, changing how it flows through the water.

Lesson Plan and Activity

Print the different torpedoes and record their performance. Examine the performance recorded of the difference torpedoes, and have the students make hypotheses as to why each torpedo performs each way. Examine those hypotheses in further tests that test those specific attributes. Key things to consider: 1. Length of flight 2. Accuracy 3. Depth at stall/stop. (Does it stall and sink? Does it slow and glide?) 4. Oscillating motion & instability: do any (namely the third one) "bob" or weave up and down along it's path? What might this have to do with it's centre of mass? Remember from the description above that the Rev 2 is the best performer, and see the "Full-Size" version for the best overall performer by far.

Materials Needed

Supplies Needed

37g of PLA are needed for the print. Use a HIGH VISIBILITY COLOUR (I recommend something from the "Neon" colour palette) A pool of water (or natural water body) between 30cm to shoulder-depth deep, and at least 3m across.