Recent Blogs
The Cutter Sailing Rig Mechanism: How It Works, Sail Plan Diagram, Parts & SA/D Formula
How a Cutter works as a fast single-masted vessel for pilot transfers, revenue patrol and coastal interception. Hull form, rig, sizing and worked example.
Ten-wheel Freight Locomotive Mechanism: How the 4-6-0 Works, Parts, Diagram & Tractive Effort
Ten-wheel freight locomotive explained — wheel arrangement, tractive effort formula, and real-world hauling examples from steam-era American railroading.
Swinging Oar-lock Mechanism Explained: How Gate Rowlocks Work, Parts, Geometry, and Pin Force
How a Swinging Oar-lock works, why rowing crews use it, and how to size pin offset and horn height for shells, dinghies, and traditional craft.
Swinging Ball-bearing Bicycle Pedal Mechanism: How It Works, Parts, Diagram and Bearing Life
Swinging ball-bearing bicycle pedals pivot under the rider's foot to reduce ankle strain. See how they work, the bearing layout, and where they fit on...
Submarine Lamp Mechanism Explained: How Submerged Navigation Lights Work, Parts, Diagram, Allard Range
Submarine lamps mark navigable channels and submerged hazards underwater. Learn how the sealed lens, ballast, and mooring work together for harbour authorities.
Street-car Sand Box Mechanism Explained: How It Works, Parts, Diagram, Formula and Stopping Distance
How a streetcar sand box works — gravity-fed sanders boost rail adhesion on wet, leafy, or icy track. Numbers, sizing, and real transit examples inside.
Street Railway Sweeping Car Mechanism: How Diagonal Rotary Brooms Clear Tram Tracks Explained
Street railway sweeping car explained — how rotary brooms cleared snow and debris from urban tram tracks, with real examples from Boston, Toronto and Brooklyn.
Street Cleaning Machine Mechanism: How It Works, Parts, Diagram, and Productivity Formula Explained
How a street cleaning machine works — broom geometry, suction airflow, and water spray rates explained for municipal fleet engineers and DIY builders.
Stone Dry-dock Mechanism Explained: How Graving Docks, Caisson Gates, and Pumps Work
Stone dry-dock engineering explained — how the masonry chamber, caisson gate, and pumps lift a 50,000-tonne hull clear of water for hull repair work.
Square or Reef Knot Mechanism: How It Works, Diagram, Parts, Uses and Strength Formula Explained
How the Square or Reef Knot works, why sailors use it for reefing sails, where it fails, and how to tie it correctly for binding...
Square or Lug Sail Mechanism: How It Works, Parts, Diagram and Sailing Uses Explained
How a square or lug sail works, with rigging geometry, drive force formulas, and a worked example for traditional boatbuilders and sail trainers.
Spring Wheel Mechanism: How It Works, Diagram, Parts, Uses & Calculator Explained
Spring Wheel mechanism explained — how flexible spokes absorb shock, where militaries and rovers use them, with sizing math, tradeoffs, and a worked example.
Split Lug or Square Sail: Mechanism, Sling Point Diagram, and Rig Parts Explained
Split Lug and Square Sail rigs explained — geometry, sail forces, and trim numbers for small craft, training boats, and traditional workboat restorations.
Sounding-weight Release Mechanism: How It Works, Parts, Diagram, and Deep-Sea Sounding Uses
Sounding-weight release mechanisms drop a lead from a sounding line on bottom contact so hydrographic crews recover the line clean. Specs, formula, worked example.
Sloop Yawl Explained: How the Two Rigs Work, Key Parts, Lead Balance and Real-World Uses
Sloop and yawl rigs explained — sail plan geometry, balance, helm trim, and how naval architects size them for cruising and offshore sailing.
Sloop Rig Mechanism Explained: How a Bermuda Sloop Works, Parts, Slot Effect & Tuning
Sloop rig explained — how the single-mast fore-and-aft sail plan works, why sailors choose it, with worked example sizing for a 9 m cruising yacht.
Slip Knot Mechanism Explained: How It Works, Parts, Uses, and Quick-Release Diagram
Learn how a Slip Knot works, why riggers and arborists trust it for quick-release loads, and how to size it correctly with a worked example.
Sliding Gunter Rig Mechanism: How It Works, Parts, Formula, and Uses Explained
Learn how the Sliding Gunter rig works, why sailors use it on dinghies and tenders, and how to size the yard, halyard and traveller for...
Skip Jack Mechanism Explained: How the Ratchet and Pawl Lifting Jack Works, Parts and Uses
Skip Jack mechanism explained — how the ratchet-and-pawl lifting jack works, where road crews use it, formulas, worked example, and failure modes.
Skiff Yawl Rig Explained: How It Works, Parts, Sail Balance Formula and Diagram
Skiff yawl rig explained — how the split mainsail-and-mizzen plan works on small boats, sail-area balance math, and named examples from working tenders to dinghy...
Single-cylinder Locomotive Mechanism Explained: Parts, Diagram, Tractive Effort Formula and Uses
How a single-cylinder locomotive works, why narrow-gauge industrial railways used it, plus a worked tractive-effort example for plantation and quarry haulage.
Silver's Marine Governor Mechanism Explained: Parts, Diagram, and How It Controls Marine Steam Engines
Silver's Marine Governor controls steam engine speed against varying propeller load at sea. Learn how this 1860s flyball governor works, with formulas and a worked...
Sheet Bend and Toggle Mechanism: How It Works, Diagram, Parts, Uses and Safe Load Formula
Sheet Bend and Toggle explained — how this quick-release rope joint works, why riggers and sailors use it, with worked load math and failure diagnostics.
Sheet Bend Knot Mechanism Explained: How It Works, Diagram, Parts, Uses & Load Formula
Sheet Bend knot explained — how it joins two ropes of unequal diameter, with strength figures, failure modes, and worked examples for marine and rescue...
Serpollet's Steam Tricycle Mechanism: How the 1887 Flash Boiler Steam Vehicle Works
Serpollet's Steam Tricycle used a flash boiler to power a 3-wheeled road vehicle in 1887. Learn the mechanism, formulas, and worked example for heritage builds.