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Combat Robotics Engineering Calculator

Official SPARC v1.7 & NHRL multi-class sizing suite for Beetleweight (3 lb), Antweight (1 lb), and 30 lb combat robots.

Class:
Subsystem:
Battery•Shared across all subsystem calculators
Additional weapon battery
Operating Power Configuration
Chemistry
Voltage State
Cell CountBeetle: 3S–6S rec.

Motor & Powertrain Specifications

Beetle Preset
RPM produced per volt applied
RPM/V
Internal planetary/spur reduction (e.g. 14 for 14:1)
:1
1.00:1
IN:T
OUT:T
Total Drive Ratio: 27.00:1 (Gearbox × External)
Outer tire contact diameter

Theoretical Drive Speed

Theoretical Speed
12.0ft/s
8.2 mph · 3.65 m/s
Wheel Speed1370 RPM159.6 mm travel per rotation
Motor Speed37000 RPM@ 14.8V pack
Combat Mobility Target
For all weight classes (including Beetles), target speeds of 5–8 mph (8–12 ft/s) provide ideal control and pushing responsiveness in the arena.
Voltage and Tip Speed limits are pulled from SPARC V1.7 Construction Ruleset and from NHRL Bot Design Rules.