DIY Speargun Mistakes— Still Kills Fish!

Quick Overview

The DIY speargun build, while resulting in a functional tool that successfully caught fish, involved several costly mistakes, including using the wrong epoxy hardener (205 instead of 207) and misaligning the trigger mechanism, ultimately costing around $40 more than necessary compared to buying an entry-level gun.

Key Points: The builder used West System 205 Fast Hardener instead of the recommended 207 Special Clear Hardener because the shop was cold, leading to potential long-term issues. The trigger mechanism was incorrectly installed on the wrong side of the wood blank, requiring rework. The total cost of the DIY speargun project was approximately $40 more than purchasing a new entry-level speargun. The builder calculated the potential energy stored in the bands to be 936 Joules, using the formula W = integral(F(x)dx) = 1/2 kx^2 4 bands. Wood preparation involved planing Mahogany boards, which, unlike Teak, is less oily, requiring more frequent treatment to prevent warping. The builder realized that using brass screws instead of stainless steel for mounting hardware could cause corrosion issues in saltwater. The final speargun, despite the mistakes, successfully caught a large fish, demonstrating its functionality.

Context: This video documents the process of building a custom wooden speargun from scratch, detailing the construction steps, material choices, and the inevitable mistakes encountered along the way. The narrator contrasts the DIY approach with simply purchasing a commercially available gun, highlighting the financial and practical trade-offs involved in custom fabrication.

Detailed Analysis

The creator details the process of building a custom wooden speargun, starting with the realization that small repair issues can escalate into major problems. Initial steps involved removing a stripped screw from a fish finder mount on the boat 'The Sound Pounder' (00:07) and discovering previous bad repairs, like silicone shot into a hole instead of proper fixing (00:29). The wood fabrication began with planing Mahogany boards (02:10) and cutting the shape based on a blueprint (03:05). A significant error occurred when mixing epoxy; the builder used West System 205 Fast Hardener instead of the 207 Special Clear Hardener because the shop was cold (06:22). This choice, while necessary for curing in the cold, might compromise long-term durability. The builder also made errors in cutting the trigger pocket, installing it on the wrong side of the gun blank (04:02), and used brass screws for mounting the line guide, which risks corrosion in saltwater (05:54). The builder calculated the potential energy stored in the bands as 936 Joules (01:44). Ultimately, the total cost of the DIY project exceeded the cost of buying a new entry-level spear gun by about $40 (08:03). Despite the numerous mistakes, the speargun proved successful, as demonstrated by the underwater footage of the builder catching a large fish (07:19) and the final shot of the successful catch on the boat (07:58).