Tokyo Institute of Technology; product version by HiBot · legged machine
ACM-R5H
A waterproof snake robot made of segments that each carry their own battery and motors, so it can be lengthened or shortened. Specs are for a 9-segment, 170 cm snake.
- Price
- —Not published
- Height
- 12 cmTaller than 5%
- Weight
- 7 kgHeavier than 16%
- Payload
- —Not published
- Speed
- 1.4 km/hFaster than 37%
- Battery
- —Not published
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Why it matters
An amphibious, modular snake robot that can both slither on land and swim.
Real-world use
Not published
Timeline
- First shown
- 2005
- Released
- 2010
How it stacks up
Against other legged & novel that publish the figure. Pick a measure.
ACM-R5H is taller than 5% of the 22 other legged & novel that publish a height. Bars show the 7 closest in date.
ACM-R5H is heavier than 16% of the 25 other legged & novel that publish a weight. Bars show the 7 closest in date.
ACM-R5H is faster than 37% of the 19 other legged & novel that publish a speed. Bars show the 7 closest in date.
ACM-R5H has more joints than 63% of the 16 other legged & novel that publish a joints. Bars show the 7 closest in date.
Not published by the maker: payload, battery, price.
Public attention
A historic robot: no longer sold or in use, so it is not ranked against current machines.
- No Wikipedia article of its own yet
- 1 news story from reputable press listed on this page
Measures how much people read and write about a robot, not how good it is. Measured 2026-10-13; same method for every robot. How it is measured
What’s inside
The parts the company has talked about publicly.
- Movement
- Other movement · 18 joints
- How it runs
- Assisted. An operator steered it by remote control while its onboard control generated the snake-like body waves that move it on land and in water.
- Actuators & motors
- Two DC servomotors per segment (18 DoF for a nine-segment snake); passive wheels/fins.
- Sensors & vision
- CCD cameras in head and tail segments; payload compartments for extra sensors.
- Compute
- HiBot Mini2Axes SH2 microcontroller in each segment; head with ARM Cortex-M4 and Wi-Fi.
- Battery & power
- Each segment carries its own battery and charger.
- Materials & build
- Aluminium, rubber and plastic; amphibious, dust- and water-resistant.
- Other details
- About 1.7 m and 7 kg for nine segments; modular length.
From the maker
ACM-R5H is the only machine from Tokyo Institute of Technology (Hirose lab); product version by HiBot in the atlas.
Watch ACM-R5H
Made, sold and where
Unit counts are usually company figures; analysts often disagree.
- Price
- Not published
- How to get one
- No official buying page found
- Built
- Prototype 2005; product version by HiBot from 2010
- Sold or delivered
- Offered commercially by HiBot; numbers not published (now discontinued)
- Where it is sold or used
- Tokyo, Japan
- Customers and pilots
- Not published
News
The latest 1, newest first. Summaries are ours; tap through for the original.
- HiBot shows new amphibious snake
IEEE Spectrum previewed HiBot's more modular ACM-R5H with an ARM Cortex-M4 controller at iREX 2013 in Tokyo.
IEEE Spectrum
Sources
Figures come from press coverage. Every link below backs something on this page.
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