★ N.I.C. ★
NIC-FPLG is an open concept for a two-stroke two-cylinder linear engine with an integrated tubular linear generator. No crankshaft. No camshaft. No valvetrain. Two pistons share a single rod; a tubular generator sits at the rod's centre. The engine runs permanently at one operating point in mechanical resonance; power output is regulated by the battery, not the engine.
The project grew out of a simple observation: a crankshaft converts linear motion to rotary motion just to convert it back to linear in the generator. Every intermediate conversion has losses and complexity. FPLG cuts the middle out.
- Operating point follows a full RPM map — every fuel, every load needs its own calibration
- Crankshaft, camshaft, valvetrain, timing chain — every moving part is a failure mode
- Resonance is impossible — frequency is locked to RPM, not to the physical system
- Thermal expansion mismatch between dissimilar materials requires tight tolerances everywhere
- Linear motion converted to rotary and back — two mechanical conversions, two sets of losses
- Crankshaft bearings carry the full combustion load at an angle
- Multi-fuel operation requires a full RPM × load map per fuel
- One permanent operating point — three numbers per fuel instead of a full map
- Resonance frequency set by geometry: air spring (under-piston pre-compression ~1:2) plus rod mass form a resonator — tuned by design, not software
- Matched alloy piston and sleeve — identical thermal expansion, constant clearance at all temperatures
- Geometry does the work: drop-shaped pockets in the piston face direct flow and spin the charge without a camshaft; valve inertia delays transfer timing so the exhaust leaves first
The engine never changes RPM. The battery absorbs all variable demand. Switching fuels (petrol / LPG / diesel+petrol) means changing three numbers — advance, mixture, oil dose — not remapping an entire table.
Under-piston pre-compression (~1:2) forms an air spring. Air spring plus rod mass form a resonator. The operating frequency is set by the volume below the pistons and the rod mass — tuned by design, not by software. Running in resonance means the air spring returns reversal energy for free; the generator only takes useful work.
No transfer ports in the cylinder wall. Transfer happens through valves in the piston face — racing motorcycle exhaust valves (~16 mm), running in a cold role (washed by fresh mixture from below). Drop-shaped pockets around each valve direct the charge toward the spark plug and impart rotation to the piston on every firing stroke. Valve inertia creates a natural phase delay — exhaust opens first, transfer follows.
Tubular flux-switching machine with hybrid excitation (~50 % permanent magnet / ~50 % field winding). Magnets and coils sit in the stator; the rod carries only passive laminated teeth — minimum moving mass, magnets in the cooled zone. Field can be reduced to near-zero for start-up and ramped up gradually to regulate output.
| Document | Description |
|---|---|
| DESIGN-FPLG.md | Full technical concept — 20 chapters |
| OPEN-QUESTIONS.md | What we don't know — simulation and test tasks |
| SCHEMA-FPLG.svg | Schematic cross-section (placeholder) |
calc/ |
(planned) numerical models — resonance, cycle |
Concept stage. Core architecture and design philosophy are defined. Simulations, calculations, and a prototype are next.
Contributions welcome — simulation, dynamics, manufacturing, or anyone who finds a hole in the reasoning. A specific objection is worth more than applause.
MIT License — Copyright (c) 2026 NIC — Native Intellect Community
Brother for advice during the development of this project. For technical review during concept development, to AI assistant Claude (Anthropic).
★ Viva La Resistánce ★