Recent Blogs
Windmill and Steel Tower
How a windmill on a steel tower works, sized for water pumping and air compression on remote farms. Formula, worked example, and selection guide from...
Hydraulic Air Compressor
How a Hydraulic Air Compressor (trompe) works — falling water entrains air, compresses it underground, and feeds forges, mines, and pneumatic tools without moving parts.
Direct Air Pressure Pump
Direct air pressure pumps deliver instant pneumatic flow without a tank. Learn how they work, sizing math, and real industrial uses from FIRGELLI engineers.
Windmill of Our Grandfathers
How the classic farm windmill of our grandfathers pumps water — sail design, gear ratios, stroke length, and real homestead sizing examples from FIRGELLI.
Wind Instruments
How wind instruments convert air pressure into pitched sound — the physics, the bore math, and real builds from pipe organs to brass band cornets.
Wind Gauge
Wind gauge explained — how anemometers measure wind speed, the cup formula, calibration drift, and real applications in wind farms, aviation, and crane safety.
Wedding Rotary Blower
Wedding Rotary Blower explained — how the lobed positive-displacement blower delivers oil-free air for wastewater aeration, pneumatic conveying, and process plants.
Water-jet Air Compressor
Water-jet air compressor explained — how a falling water column entrains and compresses air, plus mining, lab, and hydro applications with real numbers.
Ventilator
How a mechanical ventilator works — bellows, valves, PEEP, and tidal volume control explained for biomed techs, ICU staff, and engineering students.
Trunk Air Compressor
Trunk air compressors run roadside tire inflation, air horns, and air suspension. See sizing math, duty cycle limits, and real RV and 4x4 builds.
Torch Soldering Copper
Torch soldering copper explained — how plumbers and HVAC fitters use propane and MAPP flames to sweat copper joints at 230°C with capillary tin-lead or...
Toggle-joint Duplex Air Compressor
Toggle-joint duplex air compressor explained — how the knuckle linkage drives twin pistons, where it's used in industry, and how to size delivery and pressure.
Three-throw Bellows
Three-throw bellows deliver continuous low-pressure air for foundry cupolas, pipe organs, and forge work. See how the triple-chamber design works, with worked numbers.
Spiral Vane or Cowl
Spiral vane cowls spin freely on chimneys and vents to extract air using wind energy. See how they work, sizing math, and real applications in...
Smith's Circular Bellows
Smith's Circular Bellows delivers continuous airflow for forge work. Learn how the dual-chamber design works, sizing math, and real workshop examples.
Single Valve Air Pump
How a single valve air pump works, with formulas, sizing math, and worked examples for inflatables, lab vacuum work, and aquarium aeration applications.
Root Rotary Blower
Roots rotary blower explained — how the twin-lobe rotors move air, real CFM and pressure ranges, and where wastewater plants and pneumatic conveying use them.
Raising Sunken Vessels
Raising sunken vessels with compressed air — how salvage crews displace water with lift bags and sealed compartments to refloat ships, barges and aircraft.
Prairie Wind Mill
Prairie Wind Mill explained — how multi-blade water-pumping windmills lift bore water on remote ranches, sizing math, and real Aermotor field examples.
Portable Riveter
How a Portable Riveter works, sizing formula, worked example, and real-world applications in aerospace, HVAC, and sheet metal fabrication shops.
Pneumatic Paint Sprayer
How a pneumatic paint sprayer atomises coatings using compressed air — CFM sizing, transfer efficiency, HVLP vs conventional spec, and real shop examples.
Pneumatic Motor Drill Stock
Pneumatic motor drill stock explained — how vane motors drive portable air drills, sizing the air supply, and real shop examples from aerospace assembly.
Pneumatic Hammer
Pneumatic hammer explained — how compressed air drives the piston, blow energy formulas, real construction and foundry applications, and sizing guidance.
Pneumatic Breast Drill
Pneumatic breast drill basics for fabricators — how the vane motor, planetary gears and chest pad combine to push 1/2 inch bits through steel plate...
Piston Hydraulic Air Compressor
How a piston hydraulic air compressor works, sizing formula, worked example for a mining workshop, plus tradeoffs vs rotary screw and electric piston units.