ENERGY SYSTEMS

Thermodynamics, Efficiency, and the Art of Making Things Move
Wind & Wireless emblem

β€œEnergy goes in, heat comes out. Never a miscommunication.”

Physics is pretty neat like that. So what?

⚑ SO MANY WAYS TO MAKE POWER

We can shape heat into a LOT of different things.

πŸ”₯
Thermal β†’ Mechanical
Heat boils water β†’ steam expands β†’ drives turbine
⏡ Rotary Motion (Shaft Power)
⚑
Electromagnetic β†’ Mechanical
Excited particles in conductors β†’ magnetic fields β†’ copper windings β†’ rotor spin
⏡ Rotary Motion (Electric Motor)
β˜€οΈ
Photovoltaic β†’ Mechanical
Sun excites silicon β†’ electrons flow β†’ motor spins compressor β†’ pressurized air
⏡ Stored Pneumatic Energy

β€œWe can couple a prop to that rotor and allow the heat to escape in that manner.”

πŸ“ WHAT IS EFFICIENCY?

β€œBut we are going to be examining the word 'Efficiency' here in critical detail.”

Ξ· = W / QH
Thermodynamic Efficiency β€” The fraction of heat absorbed by a heat engine that is converted into work.
Where W is work output and QH is heat absorbed.
Values range between 0 and 1, reflecting the effectiveness of energy conversion.

How does that fit into aviation?

β€œWe want to maximize THAT, while minimizing the weight of that system.”

✈️ EFFICIENCY IN AVIATION β€” THE TENSION

Thermodynamic efficiency tells us how well we convert heat to work. But in aviation, system efficiency is what matters.

βš–οΈ Weight
βœ— Every kilogram reduces payload and endurance
βœ“ Lighter materials, simpler systems
🌑️ Heat Management
βœ— Waste heat must be rejected or recovered
βœ“ Thermoelectric recovery, cooling system design
β›½ Energy Density
βœ— Fuel/battery weight vs. range trade-off
βœ“ Choose the right energy carrier for the mission
πŸ”„ Conversion Losses
βœ— Every conversion step loses energy
βœ“ Minimize stages (direct drive vs. geared)

The Tension: How much of that work actually moves the aircraft through the air, and how much is lost to weight, drag, and heat rejection?

πŸ”¬ ENERGY SYSTEMS COMPARISON

For a storm-chasing UAS that needs endurance, resilience, and extreme-condition operation β€” which system gives us the best weight-specific efficiency?

System Efficiency (Ξ·) Weight Complexity Pros Cons
STEAM ~20-35% Medium-High High High energy density, familiar tech, fuel flexibility Boiler weight, safety concerns, warm-up time
ELECTRIC ~70-85% Low-Medium Low Clean, instant torque, simple, reliable Battery energy density limits range
PNEUMATIC ~10-20% High Low Silent, cold exhaust, mechanically simple Heavy tanks, pressure decay, limited endurance
ICE ~25-35% Medium High High energy density (liquid fuel) Noise, heat signature, emissions, maintenance
Key Insight: Electric systems dominate on pure efficiency, but the energy density of batteries remains the limiting factor for endurance missions. Steam and ICE offer better range at the cost of complexity and heat management.

πŸš€ THE PATH FORWARD

Efficiency isn't just a number on a datasheet. It's the marriage of thermodynamics, materials science, and mission requirements.

For Skylab_2025, we're choosing a path that balances the theoretical ideal with the practical reality of what we can build, fly, and open-source.

πŸ”¬
Dive Deeper
Explore each energy system in detail
🎯
Mission Fit
Which system fits the StormChaser best?
πŸ”—
Hybridization
Can we combine systems for best of both?
Open Source: All designs, calculations, and test data will be shared with the community. Join the conversation.