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Scaled Up

Had enough fun with the smaller ones for "the boys" that I decided to make a full-size version for the "grups". Works best in about should-deep water, use your index finger to push the torpedo. Videos coming as soon as my new fancy-pants phone arrives.

New Profile:

Slightly more nose-heavy than the smaller toy, and the twist of the fins is reversed to allow a right-handed American football-style throw (also: "curveball" technique works). The nose-heavy nature means it doesn't tend upward as much, leading to no hydrodynamic stalling and thus a more continuous glide. (Old ones would "stall & sink" as opposed to "slowing and gliding")

New Density:

After reviewing my extremely suspect buoyancy calcs, I re-examined things and realized that by simply making it larger, I would increase the water fraction and approach neutral buoyancy the easy way (by being mostly water). As a result this one is about 3.5% negatively buoyant, as opposed to 4-5% for the scaled ones, it doesn't seem like a lot, but the practical difference is large.

New Range

All these changes means the ultimate range of the torpedo is at least double what the smaller versions offered. Less good for the kids, better for the adults.

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Found 1 3D-models for “toypedo” across many websites

Torpedo Toy