The Ve-lomobile, an electric shell trike.

I have an idea for a small lightweight commuter vehicle. Imagine a single-seat recumbent bicycle enclosed in a sleek, lightweight fiberglass shell. This vehicle is powered by a couple of horsepower booster motor and a lead-acid battery placed behind the seat, which can be recharged via a flexible solar panel. It offers both pedal and electric motor options, ensuring a top speed of 20 to 30 mph. Additionally, there's a small dedicated cargo space for two grocery bags or a book bag, making it a practical and efficient solution for short commutes while you pick up a few groceries on the way home.

Design Overview

1. Recumbent Bicycle Frame:

   • Ergonomics: A recumbent frame provides a comfortable seating position, reducing strain on your back and neck.

   • Stability: With a low center of gravity, it offers better stability, especially at higher speeds.

2. Lightweight Fiberglass Shell:

   • Aerodynamics: The shell will significantly reduce drag, making the ride smoother and more efficient.

   • Protection: It will provide shelter from the elements and increase safety.

   • Construction: Use a mold to create a streamlined, smooth shape. Fiberglass is lightweight yet durable.

3. Motor and Drive System:

   • Motor Selection: A 500W to 1000W motor provides a good balance of power and efficiency. You can opt for a hub motor or a mid-drive motor depending on your preference.

   • Chain Drive System: Position the motor under the seat and use a robust chain and sprocket system to connect to the rear axle. Ensure proper tensioning and alignment for optimal performance.

4. Power Source:

   • Lead Acid Battery: Though heavier, it’s reliable. Position it securely behind the seat.

   • Solar Panel Setup: Install flexible solar panels on the shell to recharge while parked. Use a charge controller to manage input and protect the battery.

5. Cargo Area:

   • Design: A small cargo area behind the seat can hold two grocery bags.

   • Accessibility: Ensure easy access without compromising aerodynamics.

6. Speed and Performance:

   • Top Speed: Proper gearing and motor assistance can achieve speeds of 20-30 mph.

   • Pedal Assist: Incorporate a system that engages the motor when pedaling for an efficient mix of human and electric power.

Additional Considerations

1. Safety Features:

   • Lighting: Integrate front and rear lights for visibility in low-light conditions.

   • Reflective Elements: Add reflective strips to enhance safety during night rides.

2. Regulatory Compliance:

   • Check local regulations for e-bikes and speed limits to ensure your design is compliant.

3. Testing and Iteration:

   • Build a prototype and conduct tests to refine performance, comfort, and safety features. Iterate based on feedback and testing results.

Materials and Components

• Frame: Lightweight metals like aluminum or carbon fiber.

• Fiberglass: For the shell construction.

• Motor: Electric hub or mid-drive motor.

• Battery: Sealed lead-acid or consider lighter lithium-ion alternatives.

• Solar Panels: Flexible, lightweight solar panels.

• Drive System: Chains, sprockets, and tensioning mechanisms.

Example Configuration

1. Frame: Custom-made recumbent bicycle frame.

2. Shell: Hand-laid fiberglass with aerodynamic design.

3. Motor: 750W hub motor.

4. Battery: 12V 20Ah sealed lead-acid battery.

5. Solar Panels: 50W flexible solar panel.

6. Cargo Area: Enclosed space behind the seat.

This design has the potential to be a highly efficient, eco-friendly solution for short commutes.