OUR STORY
An About-Face.
Maximum Delivery Engines (MDE) grew from a home-energy vision into an investigation of broader heat-driven power. This is the story of the engineering calculations, personal motivation, and company name change behind that shift.
AN ABOUT-FACE
From home energy to broader power.
The company was organized in March 2023 as Hybrid Home Energy Systems, LLC (HHES). Its initial focus was residential electricity and useful heat from solar energy and combusted fuel.
In October 2026, engineering calculations changed the founder’s understanding of the engine’s possibilities. The potential applications expanded to passenger-car hybrid generation, mobile power, and larger generators.
On October 14, 2026, HHES became Maximum Delivery Engines, LLC—the same Utah company with a name reflecting a much broader opportunity.
THE FOUNDER’S PERSPECTIVE
Why I initially focused on stationary power.
My reading of the hot-air engine literature led me to believe that size, weight, and heat-transfer limitations made these engines better suited to stationary tasks. I doubted that the engine I was developing could deliver enough practical power for an automobile.
Getting heat into and out of the working gas seemed to be the central obstacle. As geometrically similar engines grow, volume increases faster than surface area. I initially believed that relationship would limit the engine’s mobile applications.
That understanding shaped HHES: solar and combusted-fuel systems supplying electricity and useful recovered heat to homes.
ENERGY AND PROSPERITY
Why I began investigating a better engine.
During research for my book, Energy: Capitalism vs. Socialism, I came to understand useful energy as a central force in increasing productivity and helping humanity escape abject poverty. James Watt’s improvements to the steam engine offered a powerful example.
Watt’s engines remained low in absolute efficiency by modern standards, yet his separate condenser dramatically reduced coal consumption. The Science Museum describes engines using approximately two-thirds less coal—a remarkable achievement that helped extend steam power to factories, mills, and other productive work.
That connection between energy, productivity, and prosperity motivated me to investigate a highly efficient energy source that could also help reduce pollution. The question became personal: could a different heat-driven engine contribute to more accessible, cleaner power?
Historical reference: James Watt and the separate condenser, Science Museum.
OCTOBER 2026
Bringing the intellectual property into the company.
I am one of the company’s three owners. On October 10, 2026, I entered into an agreement with HHES concerning the MDE patent and related intellectual property. On October 11, I assigned the MDE patent to HHES.
During October 11–13, continued engineering and computer-aided design (CAD) work led me to reconsider the engine’s power potential.
Lower-speed operation offered more time for heating and cooling during each cycle. Heat-transfer development, including investigation of mating corrugations and hot-cap elongation, opened further possibilities. Double acting—using both working faces of one piston—expanded the calculated power potential again.
AN ENGINEERING TURNING POINT
The calculations changed my expectations.
My original calculations pointed toward modest output suited to stationary energy systems. Later calculations for pressurized, double-acting configurations suggested substantially greater ideal power potential than I had anticipated.
That opened a new question: could the architecture also serve as a compact generator in a passenger-car hybrid? In that concept, electric motors would drive the wheels, and a small traction battery would support immediate driving and passing while the MDE supplies electricity through a generator.
The calculations changed the direction of investigation. Practical output, efficiency, weight, cooling, and vehicle integration remain questions for engineering development and prototype testing.
OCTOBER 14, 2026
A name for the broader opportunity.
On October 14, I realized that I was no longer thinking primarily about a stationary solar-and-fuel home-energy engine. I was considering an engine architecture with much wider possibilities.
I began to see the potential for technology that could make a substantial contribution wherever practical heat-driven power is needed.
That day, the company adopted the name Maximum Delivery Engines, LLC. A name-change recordation was also submitted for the patent ownership records, reflecting the new name of the same company.
ORIGINS
Years of investigation and refinement.
My early interest in hot-air engines began largely as a personal engineering project. The earliest surviving tapered-chamber sketch dates to 2008. Model work in 2010 was followed by years of drawings, calculations, notebook research, and patent development.
The company formed in 2023, and the MDE patent issued in 2026. The company emblem grew from the tapered geometry visible in that early sketch.
A BROADER PURPOSE
Useful power with wider possibilities.
Solar heat remains part of the opportunity, but Maximum Delivery Engines do not depend on sunlight.
The broader purpose is useful power with simpler external heating, substantially quieter operation, cleaner combustion, and competitive efficiency—from homes and remote installations to hybrid-vehicle generation and larger generators.
The next step is to turn the calculations into working hardware and measured performance.
— David Glen Bird, founder
CONTACT
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Maximum Delivery Engines welcomes technical, strategic, manufacturing, and investor interest in the development of its technology.
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