ModularJet — Early Modular UAV Research Project

(archival project, foundational work)

Overview

ModularJet was an early modular, multi-purpose UAV concept developed to explore hybrid propulsion, thrust-vector control, and field-maintainable airframe design. The project focused on reducing manufacturing cost and maintenance complexity through extensive use of additive manufacturing and software-assisted assembly and diagnostics.

The central idea was not a single aircraft, but a reconfigurable aerial platform supported by a digital ecosystem that simplified inspection, repair, and operator training.

Core Concepts

• Modular airframe architecture enabling rapid configuration changes

• Multiple propulsion options within a common glider platform

• Thrust-vectoring control for maneuverability and experimental flight envelopes

• Low-cost additive manufacturing of primary structures

• Software-driven maintenance support
  
  

A dedicated mobile application concept was developed to support:

• automated diagnostics from onboard telemetry

• guided inspection workflows

• step-by-step digital manuals

• augmented-reality assembly and repair visualization
  
  

The intent was to reduce dependency on specialized tooling or highly trained maintenance staff, while enabling continuous learning during production and repair.

Manufacturing Philosophy

The airframe was designed around low-cost, widely available materials and distributed manufacturing:

• Additive manufacturing using PLA, PETG, carbon-fiber-reinforced filaments, and flexible polymers

• Emphasis on structural segmentation to enable local replacement rather than full airframe rebuilds

• Rapid design iteration and geometry optimization through 3D printing
  
  

A key limitation encountered was production throughput: printing time, rather than material cost, became the dominant bottleneck.

Performance Class (depending on configuration)

• Dry mass range: approximately 1.4–4 kg

• Payload class: approximately 1–2.5 kg

• Nominal cruise speed class: ~350 km/h

• Nominal range class: up to ~100 km

• Nominal operational altitude: up to ~800 m
  
  

(These values varied significantly by configuration and were treated as experimental design targets rather than fixed specifications.)

Intended Civil and Institutional Applications

The project explored multi-role use cases, including:

• terrain and infrastructure mapping

• environmental and situational data collection

• long-range inspection and monitoring

• time-critical transport of lightweight medical or logistical payloads to hard-to-reach locations
  
  

ModularJet served primarily as a systems-engineering research platform rather than a finalized product.

Project Outcome and Relevance

ModularJet was an early-stage experimental program that established several principles that later became central to the Yorozuya Robotics Suite:

• modular hardware abstraction

• hybrid propulsion exploration

• digital-first maintenance philosophy

• additive-manufacturing-driven design

• strong coupling between physical systems and supervisory software
  
  

Many of its concepts—particularly modular avionics, mixed-propulsion research, and maintenance-oriented design—directly informed later work on Okita and the broader Robotic ecosystem.