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Directory:Regi Technologies:RadMax rotary engine

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Page first featured February 3, 2009

The Radmax direct-charge engine with few moving parts is based on the Wankel rotary design, but is claimed to deliver up to three times the power, with half the weight of a true Wankel engine of the same size. It is virtually vibration free and very quiet.

With a 20:1 compression ratio, the engine can burn a variety of fuels, including natural gas, hydrogen, propane, diesel or regular gasoline.

Unlike a reciprocating piston-driven engine, John Robertson said that the Radmax design provides "constant combustion." He likened the engine's performance to riding a bike downhill, whereas a piston engine's operation is analogous to pedaling uphill (considering the before top dead center firing).

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Official Website

Products

Compression Ignition Engines
  • Multi-fuel (Diesel, JP5, JP8, DF2, DFM)
  • High power to weight ratio
  • Low maintenance, emissions and fuel consumption
Compressors - Gas Expanders
  • High efficiency (20:1) and output to size ratio
  • Scalable to any application
Positive Displacement Pumps
  • High efficiency and output to size ratio

How it Works

finalengine_320x240.gif schematic2.gif

Intake
The fuel/air mixture is injected through the intake port in the end housing, in to a "compartment" created between two vanes, the rotor and the outer housing walls.
Compression
As the fuel/air mixture is swept along the cam the space between the vanes gets smaller, causing compression.
Power
Under high enough compression (diesel) or with either a glow or spark plug, the compressed fuel is ignited. As the fuel burns, it expands, driving the rotor forward.
Exhaust
The exhaust exits through the exhaust port in the outer housing, as once again, the chamber narrows and the exhausted fuel is driven out of the compartment through a port in the end housing.

This cycle takes place on both sides of the rotor for an incredible 24 power strokes per one revolution. This lets the RadMax™ engine generate 1 hp/ 0.75 lb, as compared to a conventional internal combustion engine's 1 hp/ 6 to 7 lb. Also note that the rotor and the vanes on the Radmax TM engine replace the 40 moving parts on a conventional engine, including timing gears, connecting rods, pistons, cylinders and valves.


"The engine is comprised of a disc-shaped rotor and driveshaft which turn the housing, or stator, which remains stationary. Up to 12 vanes mounted parallel to the shaft slide up and down along the outside of the rotor as they follow a track along the inside of the stator housing. Combustion chambers form between the rotor, stator walls and vanes, and their volumes change as the vanes move during rotation. Although the design could use only two vanes, the current version has 12, which generate 24 combustion events (intake, compression, ignition, exhaust) per rotation. This lets the engine generate 1hp/0.75 lb, as compared to a conventional internal-combustion engine's 1 hp/6 to 7 lb. The engine has a compression ratio of 20:1, which lets it burn a variety of fuels, including diesel. It also uses 13 moving parts rather than 40 for conventional piston engines. That's because the rotor and vanes replace timing gears, connecting rods, pistons, cylinders, and valves. This should improve reliability and cut manufacturing costs. The engine also generates lower vibrations because all the components are spinning in the same direction. There are no pistons or valves making thousands of abrupt changes per minute. The combustion chambers are also balanced around the rotor, plus the rotor acts as a flywheel to smooth out power imbalances and eliminate destructive harmonics."

Reg Technologies Inc. says that its Radmax direct-charge engine is based on the Wankel rotary design but can deliver up to three times the power with half the weight of a true Wankel engine of the same size. "It's a very simple design, so it's very efficient," said John Robertson, president of the Richmond, British Columbia, engine maker, which shares the rights to the Radmax technology with subsidiary Regi U.S. Inc.

John Robertson's company claims to have solved the sealing problem through an innovation it calls flat-surface sealing. The technique eliminates corners, making it easier to seal engine components such as combustion chambers.

Unlike a reciprocating piston-driven engine, Robertson said, the Radmax design provides "constant combustion." He likened the engine's performance to riding a bike downhill, whereas a piston engine's operation is analogous to pedaling uphill.

In the Radmax design, a disk-shaped rotor and drive shaft turn a circular housing. Up to 12 vanes, substituting for pistons, are mounted parallel to the shaft to help form combustion chambers. A 20:1 compression ratio means the engine can burn a variety of fuels, including natural gas, hydrogen, propane, diesel or regular gasoline.

RadMax Specifications

• Engine Type: Axial Vane • Combustion Events Per Revolution: 24 • Rotor Diameter: 10 in • Horsepower: 125 hp • Displacement: 66.2 cu in • Cooling: Air Cooled • Lubrication: Splash • Fuel: JP8, JP5, DF2, DF1, DFM • Speed: 600 – 10,000 rpm • Torque: » 80 lb-ft @ 7,200 rpm • Fuel Consumption: < 0.4 lb/hp-hr • Starting Torque: < 9 ft-lbf at 600 rpm • Operating Temp: -5° to +130°F • Exhaust Temp: < 700°F • Weight: » 100 lb • Major Overhaul: 10,000 hrs • Seal Replacement: 2,500 hrs • Power Density: > 1 hp/lb @ 7,200 rpm • Vol. Density: > 1.5 hp/cu in @ 7,200 rpm

Positive Displacement Pump Specifications

• Pump Type: Axial Vane • Pump Events Per Revolution: 48 • Rotor Diameter: 10 in • Displacement: 66.2 cu in • Output: » 1,700 gpm@ 3,600 rpm • Dynamic Suction Head: > 20 ft • Head: > 80 ft • Pump Efficiency: > 90% • Power Requirement: » 0.025 hp/gpm @ 45 psi • Power Source: Compressed Air, Electric Motor, or Engine • Pump Lubrication: Splash • Weight: » 100 lbs

Compressor - Expander Specifications

• Compressor Type: Axial Vane, Positive Displacement, Adiabatic • Exchange Events Per Revolution: 48 • Rotor Diameter: 10 in • Displacement: 66.2 cu in • Compression Ratio: > 20:1 • Working Pressure: 290 psig • Free Air Delivery: » 275 scfm @ 3,600 rpm • Compressor Efficiency: > 90% • Power Requirement: » 0.31 hp/scfm @ 290 psi • Power Source: Compressed Air, Electric Motor, or Engine • Lubrication: Splash • Weight: » 100 lbs

Videos

(7.06 Minutes)

  • RadMax - new rotary engine (RegTech) Rand Cam engine. (YouTube; December 21, 2006)

- - - -

Costs

Advantages

  • SIMPLICITY: Only 2 unique moving parts, the vanes and rotor – does not use pistons, valves or spark plugs reducing assembly and maintenance costs.
  • POWER: Compact size and high output results in up to 6 times size and weight savings over a piston engine of same horsepower.
  • EFFICIENCY: Delivers better than 1 hp per pound of engine weight, and more than 1.5 hp per cubic inch of engine displacement.
  • Compact size
  • Multi-fueled
  • Low maintenance
  • Low emissions
  • Efficient fuel consumption
  • Reduced noise

Applications

  • Power generation
  • Heavy equipment
  • Hybrid electric vehicles
  • Recreational vehicles
  • Lighter / smaller diesel engine replacement
  • Aircraft and Unmanned Aerial Vehicles (UAV)
  • Motorcycles
  • Small engine and portable power tools
  • High efficiency & output to size ratio
  • Portable air compressors and pumps
  • Industrial liquid and gas processing
  • Micro-power
  • Construction
  • Marine
  • Air conditioning
  • Home appliances

Independent Testing

Prototype 42 hp Engine

6 inches dia. 6 inches long 42 hp at 7000 rpm 40lbs.

  • Tested at NAVAIR PSEF Oct. 2003

Patents

Abstract

An internal combustion rotary engine that employs resilient, flexible vanes attached to a rotor that spins within an oval cavity in a housing. The vanes, which are long enough to extend slightly radially from the rotor by a distance beyond the interior surface of the cavity, bend in response to the cyclical variation between the rotor and the oval cavity in order to define four chambers and form a sliding seal with the interior surface. As the vanes revolve with the rotating rotor, the volumes of these four chambers vary cyclically and enable the four phases of an approximate Otto Cycle. The engine is more efficient than a conventional, reciprocating engine because the expansion force of the combustion gas acts directly on the rotating element with a minimum of moving parts. Diagrams

Canadian patent issued for the RadMax™ Rotary Engine issued. The term of the patent is twenty years from the date of the filing on December 11, 1992. (October 2004)

Profiles

Company: Reg/Regi Technologies Inc.

John Robertson - President, Regi US and Reg

James Vandeberg - President and Director, RadMax Technologies, Inc.

Reg Technologies has spent $11 million on Radmax engine development over the past several years. "We see light at the end of the tunnel," Robertson said.


Inventor: David C Renegar

Coverage

In the News

  • Reg/Regi Technologies - The RadMax™ engine is an internal-combustion engine built around a rotary design. It would have two to three times the power and weigh half as much as a Wankel engine of the same size. It offers multifuel capability, fewer moving parts, high and efficient rates of combustion, low weight, reduced vibration, and ease of maintenance.
  • REGI U.S., Inc. / Reg Technologies Inc. Announce RadMax(R) Diesel Engine Design Review Successfully Completed - They have completed the detailed design review of RadMax® diesel engine models and drawings developed using the Solid Works CAD/CAM/CAE package. The improved design integrates features to simplify mechanical interfaces, reduce friction, and improve sealing. The next step immediately following the detailed design review is the fabrication of prototype RadMax® diesel engine hardware, and start of testing to prove the RadMax® technology to several interested potential partners. (BNet; Oct. 2008)
  • REGI US Completes Prototype RadMax Pump - The completed pump prototype is 10-inches in diameter and weighs 140 pounds. Maximum pressure is 500 psi, and the pump will handle any oil or water.(GreenCar Congress; Oct. 19, 2007)
  • Rotary engine revs for comeback - Reg Technologies Inc. says that its Radmax direct-charge engine is based on the Wankel rotary design but can deliver up to three times the power with half the weight of a true Wankel engine of the same size. (Automotive DesignLine; Dec. 15, 2006)

Other Coverage

  • Rotary Engine - The basic idea of the engine is two cams facing towards each other with a combustion space and a rotor in between them, and a mechanical output shaft through the center. The rotor can slide along the shaft, but it only rotates with the shaft. The rotor divides the combustion space into four separate sections (two on each side). There are two full combustion cycles of the engine per revolution. (HalfBakery; Feb. 15, 2007)
  • Rotary News - John Robertson has spent more than a decade perfecting an engine his boosters claim could mark the death of the piston. He will know soon whether it was time well spent. (Dec. 1, 2006)

Comments

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Directories

Contact

Reg Technologies Inc. and REGI U.S. Inc.

240 - 11780 Hammersmith Way
Richmond, British Columbia
Canada V7A 5E9
Tel: (604) 278-5996
Toll Free: 1-800-665-4616
Fax: (604) 278-3409
E-Mail: info@regtech.com

RadMax Technologies, Inc.

601 Union Street, Suite 4500
Seattle, WA 98101

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