Introduction
The tiniest diesel engine ever built fits in the palm of your hand, yet it can spin a small aircraft propeller. It’s smaller than a quarter and surprisingly capable.
World’s Smallest Diesel Engine: Size, Power & Price Explained
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Image: World’s Smallest Diesel Engine: Size, Power & Price Explained – Performance Comparison and Specifications
Design & Looks
Engineers at the University of Tokyo created a 3‑cm‑diameter, 0.5‑kg diesel that looks like a metal grain of rice. Its compact metal housing hides a four‑stroke cycle, fuel injector, and tiny turbocharger. The design focuses on ultra‑light weight and simplicity, making it perfect for drones, hobby aircraft, and portable generators.
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- Size: 30 mm diameter, 10 mm thick
- Weight: 0.5 kg (1.1 lb)
- Materials: CNC‑machined aluminum alloy
Performance & Mileage
Despite its size, the engine produces 1.5 kW at 8,000 rpm and runs on standard diesel fuel. Tests show a fuel consumption of about 0.3 L/h at cruise, giving an impressive endurance for its class. For a hobbyist drone, that translates to roughly 30 minutes of flight per 0.1 L of fuel.
- Power: 1.5 kW (2 hp)
- Fuel consumption: 0.3 L/h
- Operating speed: 8,000 rpm
Price & Rivals
Currently the engine is available to researchers and limited‑run hobbyists for about $1,200. Competing micro‑propulsion solutions rely on electric motors, which are cheaper but need batteries. The diesel’s advantage is long run‑time without recharging, though it costs more and requires fuel handling.
- Price: $1,200 (limited production)
- Key rivals: Electric brushless drones, micro‑gas turbines
Quick Specs
| Engine | Mileage | Price | Top Features |
|---|---|---|---|
| Mini Diesel (3 cm) | ~0.3 L/h (≈30 min flight per 0.1 L) | $1,200 |
|
FAQ
What is the fuel consumption of the world’s smallest diesel engine?
It burns about 0.3 liters of diesel per hour at cruising speed, giving roughly 30 minutes of flight for every 0.1 liter.
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Is this tiny diesel engine worth buying for hobby drones?
If you need longer flight time without heavy batteries and can handle fuel, it’s a compelling option despite the higher price.
How does the smallest diesel compare to electric alternatives?
The diesel offers longer endurance on a single fuel tank, while electric motors are cheaper, quieter, and simpler to maintain.
Join the Conversation
What would you power with a diesel engine that fits in your hand? Share your thoughts below.
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Source: Read Official News