Robert Q. Riley Enterprises: Product Design & Development

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Section view
of 5-lb Jet
Section View of G8-2-5 Jet. Featured in Mechanix Illustrated magazine.


20-lb Jet
G8-2-20 Jet


Inventor With
130-lb JetEugene Gluhareff with 130 lb jet.


Test FlightMEG-2X flight test


Rotor HeadMEG-2X Rotor Head



Sample of MEG-2X PDF drawings on disc (2 Sheets of a set of 26)

Sample of 5-lb Jet Drawings
Sheet 1 of 4





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Gluhareff Pressure Jet Engine
Jet You Build From Plans

Plans on Disc Include
2D CAD Drawings, CAD-Accurate 3D Models
Complete Assembly Instructions, Design/Engineering Details
Where to Get Parts, Free Viewing Software for 2D & 3D CAD

You get All Sizes:    20-lb, 40-lb, 80-lb & 130-lb Thrust Jets Modeled in Rhino
Plus BONUSES: 5-lb Thrust Jet & MEG-2X Helicopter Modeled in Solidworks 

G8-2-20 Jet and MEG-2x Helicopter


Order plans

Reduced Price  $75
Plans are now shipping and they are beautiful
Click for a sample of the MEG-2X Drawings

    The dream of personal flight goes back to Icarus, the mythical character who made wings of wax and feathers, then soared too close to the sun. Today the vision is lived out in modern form with machines such as flying platforms, rocket propulsion backpacks, and fixed-wing ultralight aircraft. But the idea of a VTOL machine - a personal ultralight helicopter - holds a special fascination for those of us who are smitten.
        Video clip of nighttime firing When Eugene M. Gluhareff examined the technical challenges of personal flight from his perspective as a helicopter design engineer, it quickly became obvious that the absence of a suitable blade-tip powerplant was the missing ingredient. So he designed his own powerplant specifically for this type of application. Today's pressure jet engine is the result of some 30 years of refinement. And you can build the engine yourself following the step-by-step instructions in our comprehensive plans package.

Simple Design

        80-lb jet with transparent combustion chamberThe simple design of the Gluhareff Pressure Jet engine is one of the reasons for its huge popularity.  The jet is a remarkably simple device made of thin-wall stainless steel tubing and sheet metal. Inside, it contains only a length of coiled steel tubing (the fuel line), which gasifies and super-heats the incoming liquid propane before it is injected at supersonic speed at the top of the intake stack. The engine has no moving parts, yet it is fully throttleable.
    One of the most remarkable aspects of the engine is that it works at all. Prior to Mr. Gluhareff's design, engineers had understood that it was possible to produce thrust by using the energy of pressurized propane to induce the fuel/air mixture. Calculations, however, indicated a maximum thrust of less than 10 pounds, and extremely high specific fuel consumption (fuel consumed per unit of power output). The secret to the success of the Gluhareff Pressure Jet is its sonically tuned intake stack, which results in far greater thrust and far lower specific fuel consumption.
         Three intake stages are sized according to the length of the sound waves produced when the engine is running. The sound waves act against the intake stack to create a pumping action that pressurizes the incoming fuel/air mixture. If the intakes are not in tune, the small 20-lb thrust engine, for example, produces less than ten pounds of thrust. The fish-mouth cut at the rear of the tailpipe reduces noise and increases thrust. 
         Building the jet requires some sheet metal forming, but much of it can be assembled from stock materials. For example, the exhaust pipe, combustion chamber, and fuel lines are cut from thin-wall stainless steel tubing.  The intake stages, the diffuser skirt that blends the final intake stage into the combustion chamber, and the transition piece between the combustion chamber and the exhaust pipe are hand formed. You can spin the nose cone on an ordinary home workshop woodworking lathe.  By doing the fabricating and welding yourself, total building costs can be held to little more than the cost of the sheet metal, tubing, and fittings.

Intake to CL Burner
SFC Static
(lbs fuel per lb thrust per hour)
SFC Dynamic**
(lbs fuel per lb thrust per hour)

*Oval intake/round intake
**With ram air intake, SFC declines with increased speed. SFC at 293 ft/sec (89.4 m/sec) is approximately 1/3 of static value.

About The Inventor

       Eugene M. Gluhareff was a graduate Aeronautical Engineer from the Rensselaer Polytechnic Institute in Troy, New York. He was a key figure in the history of the helicopter almost from its inception, working directly under Igor I. Sikorsky and side-by-side with Igor A. Sikorsky, Chief of Aeronautics at Sikorsky Aircraft Corp.
In addition to producing many conventional helicopter designs, he also pioneered the single-bladed rotor system, and invented the Kerosene Fueled Valveless Pulse Jet engine, which was used to power the world's first single-bladed one-man helicopter (also of his design). Later he developed a Delta-Wing Convertiplane for the USAF, which utilized a foldable single-blade rotor with a blade-tip cold-jet power system. He was Project Engineer on the Top Sergeant pulse-jet powered helicopter, and developed the XH-26 one-man tip jet powered helicopter for the USAF.
In the early 1960's, Mr. Gluhareff developed rotary wing drones for the U.S. Navy. After joining Douglas Aircraft Co. in 1963, he worked as Design Engineer Scientist on the Saturn Rocket and was in charge of the sequence of events from firing to parking orbit on subsequent launchings. Following the Saturn program, he became Specialist in the design of Rocket Stabilization Systems for ejection seats and space capsules.
In 1972, he established EMG Engineering in Gardena, California, where he continued the development of the propane-fueled pressure jet engine featured here. Building this remarkable jet engine will be a gratifying and inexpensive way of owning an important piece of aviation history.

About the Plans

         Jet cover insertThis plan-set is based on Mr. Gluhareff's original drawings, technical documents, hand-written construction notes, and photographs. Engineering/theoretical information in the manual was taken from the Technical Handbook provided by Mr. Gluhareff with the GTS-15 Teaching Stand, which has been used by universities to teach the principles of jet engine operation. The step-by-step construction procedures in the manual, which runs in a web browser, were derived from Mr. Gluhareff's professional notes and drawings on the various procedures used to hand-build engines in his workshop.   Previously unpublished photographs in the manual let you look over the shoulders of one of Mr. Gluhareff's craftsmen and see the engine at various stages of construction as it's being assembled.  
       Conventional 2D drawings are included in both PDF and CAD formats.  IGES files on the disc give your machinist the the ability to make quick work of the injection nozzle.  Native 3D files allow for importing.
         With this plan-set, you receive the only authorized and updated work available of Mr. Gluhareff's designs. Complete plans are provided on CD-ROM. The CD-ROM runs in a web browser and you navigate just like you would navigate through a website on the Internet.  Links to online vendors and videos are provided on the disc.  If desired you can print the 2D drawings from the PDF files on disc, or you can order a complete set of 19 D-size drawings with your CD-ROM, or you can return and order prints later on. 

The Printed Plans Option on the Order Form
The Bonus plans for the 5-lb jet and the MEG-2X backpack helicopter are available only on CD-ROM in electronic format.  If desired, the 2D drawings on the disc can be printed by a local service.  If you select the option on the order form to include printed plans, you will receive 19 D-size drawings, which will include all four thrust-sizes of the jet.  This set of prints, however, will not include drawings of the MEG-2X and the 5-lb jet.  Those drawings can be printed from the disc. 

    Bonuses You Will Receive

     You will receive two bonuses with your new plan-set on disc; an easy-to-build 5-lb thrust engine for desktop demonstration and plans for the MEG-2X experimental backpack helicopter.  Both of these items have been modeled in 3D CAD.  Neither of these plan-sets have been offered before now.  As an aid to those that would like to experiment with ultralight helicopters, the disc includes links to 13 in-depth seminars on helicopter aerodynamics, design, and operation.  Although the plans are mainly about the pressure jet engine itself, rotary wing enthusiasts will find the package a virtual gold mine of information.  3D CAD models and drawings can be viewed on your computer without having to purchase the native software.  The viewer lets you rotate, pan, make section views, take dimensions, and make parts transparent so you can see what's underneath.  It creates a whole new depth of understanding how the items are built and how they work. 

A Powerful Teaching Aid

     Copy of page in manualThere is nothing like the 3D CAD experience to get youngsters motivated about the computer aided design and the engineering professions.    And there is nothing as effective as these modern technologies to assist in the actual building process.    The educational community calls it “project-based learning”, and it's a powerful way to engage participants - professors and students alike.  If you want to spark enthusiasm in a youngster, work with him or her in building an exciting and serious project like a jet engine.  It will absolutely transform the impact of the experience, and you will be teaching things you may not even know you are teaching - project management and funding, computer aided design, the relationship of effort to reward, as well as actual mechanical and fabrication skills.   And as a DIY enthusiast, it will transform your experience as well. You will learn things like the relation of thrust to the fuel's energy and the design of the engine, and how a reaction motor's thrust translates into horsepower or kilowatts.  Universities have used the G8-2 jet to teach physics because it captivates students' interest, and it serves as a simple model for the physics of converting fuel into power.  Details and equations are in the manual on disc.  Click on the image to the right to see a sample page taken from the beginning of the technical discussion in the manual.       (If the large image is unclear, your browser may have resized it to fit your monitor. Displaying it full size will give better results.) 
     Cory Waxman, a professor at Bioscience High School in Phoenix, has created a school-wide sustainable transportation program around our XR3 Hybrid three-wheeled vehicle.   Click on the following link for a brief article by Mr. Waxman on how this hands-on project is transforming the learning experience for students:  Project Based Learning  
     Although it uses the XR3 Hybrid as an example, and certain features may not apply to this project (like decals and the ability to do 3D printing), here's a general overview of our CAD-based plan-sets:  Advanced CAD-based plan-sets.   For this presentation, the 5-lb jet and MEG-2X helicopter were done in Solidworks.  The other jets, 20-lb through 130-lb, were done in Rhino.  Native files are on the disc, plus in a format that can be viewed on your computer with a free viewer, without having the native CAD program.

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Other Items on This Site

  • Trimuter: Information Page.  Trimuter was the  most popular project in the 75-year history of Mechanix Illustrated magazine.  Over 30,000 sets of Trimuter plans are in the field.  During that period, Trimuter car clubs cropped up around the US, and groups of ten or more could sometimes be seen on the highways. Trimuter appeared in the movie Total Recall - highly modified by the studio.
  • Tri-Magnum: Information Page. Tri-Magnum is a close second to Trimuter in terms of absolute popularity. Tri-Magnum is a machine built around raw performance.  The best versions were built on a Honda Gold Wing motorcycle.  The Tri-Magnum page has links to videos of this exciting vehicle on the road.  It appeared in a news piece at the Daytona 500 Motorcycle races.
  • XR3 Hybrid: Information Page.  The XR3 Hybrid is our most ambitious project to date.  Powered only by its diesel engine, it can turn in as much as 125 mpg.  The XR3 is serving as the centerpiece of a school-wide program on sustainable transportation at Bioscience High School in Phoenix, Arizona.  The school's Cory Waxman is a proponent of project-based learning (see link above).  Videos of the XR3 on the road are linked from the XR3 informaton page.  The XR3 appeared in the movie "Looper" and in a Discovery Channel piece entitled "Future Radical Vehicles". 

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