An old boatbuilders trick for rounding spars - the 7-10-7 rule

Most people think wooden boatbuilding requires complicated math. It doesn’t. The 7-10-7 rule is a simple geometric trick that lets you turn square stock into a perfectly rounded spar — quickly, accurately, and without repetitive calculations. Square → Octagon → 16 sides → Round. Simple. Elegant. Reliable. 🌐 nomadboatbuilding.com 🛠 Support the channel: patreon.com/nomadboatbuilding #boatbuilding #woodworking #sparbuilding #handtools #traditionalcraft #geometry #DIY