Explainer on Engineering Tools https://eng-tools.dev/explainer/ Recent content in Explainer on Engineering Tools Hugo en Tue, 07 Jul 2026 00:00:00 +0000 How deep does it go? — the physics behind the concrete-penetration tool https://eng-tools.dev/explainer/a4-penetration-depth/ Tue, 07 Jul 2026 00:00:00 +0000 https://eng-tools.dev/explainer/a4-penetration-depth/ Play the two-zone penetration model, then read where every symbol and constant comes from. The on-ramp to the A4 tool.