Recent Blogs
Smith Rotary Engine: Four-Arm Mechanism, Animation and Indicated Power
See how four slotted arms and an eccentric head disc move in Smith’s rotary engine, with a separate indicated-work, power and torque calculator.
Ruth's Rotary Engine: Rotating Cylinders and Eccentric Guide Ring
Explore Ruth's three rotating cylinders and eccentric guide ring, with a calculator for indicated work, mean torque and power.
Rotary Engine (form 2) Explained: How the Eccentric Vane Steam Mechanism Works, Parts and Uses
How a Form 2 rotary steam engine works — eccentric drum, sliding abutment, multi-vane sealing. Real numbers, worked example, and heritage steam applications.
Bartrum and Powell Rotary Engine Mechanism: How It Works, Diagram, Parts and Uses Explained
Follow the Bartrum and Powell engine’s orbiting cylinder and rocking wing guide. Compare crank geometry, shaft frequency and an entered clearance.
Roller Piston Rotary Engine: How It Works, Diagram, Parts, Formula, and Uses Explained
How a Roller Piston Rotary Engine works — internal geometry, sealing, torque output, and real steam-power applications from marine launches to mill drives.
Ritter Rotary Engine Mechanism Explained: How It Works, Parts, Diagram, Formula and Uses
How the Ritter Rotary Engine works — a 19th-century rotary steam engine using sliding abutments and a drum piston. Theory, formula, worked example, and restoration...
Napier Rotary Engine: Eccentric Rotor and Sliding Wings
Explore the Napier rotary engine's eccentric rotor and shell-mounted sliding wings. Calculate limiting gaps and geometric area and volume from entered dimensions.
Franchot Rotary Engine: Sliding-Wing Mechanism and Animation
Explore the Franchot sliding-wing rotary engine: a slotted rotor, a rigid sliding wing and an ovoid casing, with an animation and piston-power comparison.
Forrester Rotary Engine: Historical Mechanism and Ideal Torque | FIRGELLI
Explore Hiscox’s Forrester rotary-engine arrangement and a separate ideal pressure-force, lever-arm torque and power comparison.
Double-Slide Piston Rotary Engine: Radial Slides and Ovoid Chambers
Explore two opposed radial slides in an ovoid rotary-engine casing. Calculate slide travel, guide engagement and static chamber volume for a selected ellipse.
Davies' Disc Engine Mechanism Explained: How the Wobble Disc Rotary Steam Engine Works
Explore a nutating disc inside conical heads and a spherical case. Calculate rim-height range, projected diameter, crank orbit and cycle frequency.
Cochrane Rotary Engine Mechanism: How It Works, Parts, Diagram, and Uses Explained
Explore a single rotating wing and hollow eccentric drum in the Cochrane rotary engine. Calculate crescent volume, ideal mean torque and work from assumed effective...
Boardman Rotary Engine: Concentric Rotor and Hinged Pistons
Explore the Boardman engine’s concentric rotor and hinged pistons. Compare illustrative casing dimensions, added segment volume and piston passage timing.
Berrenburg Rotary Engine Mechanism: How It Works, Parts, Diagram, and Uses Explained
Explore the Berrenberg rotary engine’s opposed pistons and synchronized cavity valve. Compare mean shaft torque, work and power from entered performance assumptions.
Davies Disk Engine: Nutating Motion, Geometry, Torque and Power Calculator
Explore the Davies nutating disk engine. Compare its motion geometry and estimate mean shaft torque and power from entered cycle displacement and mean effective pressure.