Product Documents
Blitz Pro 2306 Brushless Gearmotor 27:1
Blitz Pro 2306 High-Torque Gearmotor (27:1)
The Blitz Pro 2306 Gearmotor (27:1) is a compact, high-torque brushless solution designed for demanding weapon systems and high-load applications in 3lb beetleweight combat robots. Developed by Just ‘Cuz Robotics, this variant pairs a higher-KV brushless motor with a 27:1 single-stage gearbox to deliver controlled torque, impact resilience, and efficient power delivery under heavy loads.
Ideal for hammersaws, lifters, and large-wheel drive systems, the 27:1 Blitz Pro emphasizes strength, reliability, and survivability rather than outright speed. Its single-stage design reduces shock transfer and improves durability in roles where stalled or back-driven conditions are common.
- High-torque output: Well suited for weapons, big wheel bots, and heavy-load mechanisms
- Single-stage durability: Designed to survive shock, stalls, and impact loads
$56.00
11 in stock (can be backordered)
Blitz Pro 2306 High-Torque Brushless Gearmotor (27:1)
The Blitz Pro 2306 Gearmotor (27:1) delivers controlled, high-torque brushless performance for weapon systems and heavy-load mechanisms in beetleweight combat robots. Developed by Just ’Cuz Robotics, this configuration pairs a higher-KV brushless motor with a single-stage 27:1 planetary gearbox to prioritize torque, strength, and survivability under demanding conditions where stalling, shock loads, and back-driving are expected.
Unlike high-speed drive gearmotors, the 27:1 Blitz Pro is intended for roles where force matters more than outright RPM. It excels in hammersaws, lifters, actuated weapons, and large-wheel bots where mechanical leverage and sustained load place extreme stress on motors and gearboxes. The single-stage reduction minimizes internal shock transfer and reduces failure modes common in multi-stage designs when subjected to sudden reversals or weapon impacts.
Design Priorities
- High-torque output: Optimized for weapons, hammersaws, lifters, and big wheel bots
- Impact survivability: Steel gears, billet shaft, dual ball-bearing support
- Single-stage durability: Fewer failure points under shock and stall conditions
- Practical voltage flexibility: Designed for reliable 3S–6S operation
- Efficient power delivery: Brushless design runs cooler under sustained load
- Back-drive tolerance: Reduced internal stress when mechanisms are forced or stalled
This motor is commonly run on 3S through 6S LiPo depending on application. Lower voltages emphasize controllability and mechanical safety, while higher voltages increase available torque and response speed for aggressive weapon systems. The hardened 6mm D-shaft supports direct coupling to hubs, arms, or weapon components—trim the shaft flush when appropriate to avoid exposing it as an impact target.
Sensorless brushless performance in high-load applications depends heavily on ESC configuration. Startup behavior, stall recovery, and torque response are primarily determined by ESC firmware and tuning. AM32-based ESCs with appropriate kV settings and startup parameters provide consistent engagement and predictable torque delivery in weapon and actuator roles.
Construction is competition-ready throughout: hardened Mod0.4 steel planetary gears, a 6mm alloy-steel output shaft with dual bearing support, and a rigid aluminum housing designed to withstand repeated shock loads common in weaponized systems.
Features
- High-torque focus: 27:1 reduction optimized for weapon systems, hammersaws, and big wheel bots.
- Single-stage survivability: Fewer reduction stages reduce shock transfer and failure points under impact and stall loads.
- Brushless efficiency under load: Runs cooler and more efficiently than brushed motors in sustained, high-force applications.
- Back-drive tolerant: Geartrain tolerates forced rotation, reducing internal stress when mechanisms are stalled or struck.
- Arena-grade construction: Hardened Mod0.4 steel gears, billet 6mm D-shaft, and dual ball-bearing support.
- Voltage flexibility: Designed for reliable operation across 3S–6S depending on torque and response needs.
- Compact torque package: 24mm gearbox diameter with a short, rigid assembly for dense weapon layouts.
- Builder-designed: Developed by competitor/engineer Seth Schaffer and validated through competition testing.
General Note: Specifications and test data shown are representative and provided for comparison and design guidance. Actual performance depends on ESC firmware, tuning, protection settings, voltage, and mechanical load.
Recommendation: If mounting weapon arms, wheels, or hubs directly to the shaft, the designer recommends that you trim the shaft flush to reduce side-impact risk. This is optional but can significantly reduce damage; less necessary when guards or enclosed mounts are used.
| Specification | Details |
| Gear Ratio | 27:1 single-stage |
| Motor | Blitz 2306, 1500KV |
| Voltage Range | 3S–6S (11.1V–22.2V) |
| Speed (approx.) | 290RPM @12V (3S) 386RPM @16V (4S) 483RPM @18V (5S) 579RPM @24V (6S) |
| Weight | 76.8g (2.71oz) total assembly |
| Gearbox Diameter | 24mm (0.94in) |
| Assembly Length | 37mm (1.46in) from gearbox face to rear of motor |
| Gearbox Length | 27.9mm (two-stage planetary) |
| Output Shaft | 6mm D-shaft, 38mm (1.50in) length (trimmable) |
| Mounting Pattern | 4×M3 on 19mm (0.75in) bolt circle |
| Wires | 105mm (4.13in) 24AWG silicone leads |
| Connector | MR30 (included) |
See a comparison chart for Just Cuz Blitz Pro gearmotor variants here.
Test Data (Preliminary)
Measured on a Prony-brake dyno. Results vary with ESC firmware, protection settings, and tuning. Data is intended for apples-to-apples comparison, not guaranteed zero-RPM stall values.
- Peak torque (27:1 gearbox): 2.7Nm @12V, 3.2Nm @16V (motor-only ~101–120mNm)
- Equivalent torque (5.2:1 reference): ~0.52Nm @12V, ~0.62Nm @16V (not at 0RPM)
- Efficiency (27:1): 73.5% @12V, 75% @16V, 68.2% @24V
- Peak output power: 71W @24V (43% efficiency), ~7100RPM, ~91mNm motor-only
- Peak input current: ~8.75A @3S, ~14.5A @6S (ESC-dependent)
- Phase resistance: 0.619Ω
ESC Notes
- Firmware: AM32 recommended; V2.16 tested. V2.18 adds PWM-by-RPM mode.
- KV setting: Match ~1500KV on 6S; scale appropriately for lower voltages.
- Braking: Tune carefully for weapon systems to manage heat and recovery behavior.
What is the 27:1 Blitz Pro intended for?
The 27:1 configuration is designed for high-torque applications such as hammersaws, weapon mechanisms, and big wheel bots. It prioritizes torque delivery, shock tolerance, and survivability over top-end speed.
Is this a drive motor?
No. While mechanically capable, the 27:1 Blitz Pro is optimized for torque-heavy mechanisms rather than primary drive. Builders typically choose the 5.2:1 version for drive systems.
How does this compare to brushed weapon motors?
Expect comparable or higher usable torque with significantly better efficiency, reduced heat, and improved resistance to impact shock. Brushless operation also avoids commutator wear common in brushed weapon motors.
What voltage should I run?
The motor supports 3S–6S (11.1V–22.2V). Lower voltage emphasizes controllability and torque margin; higher voltage increases speed and power. Many weapon builds favor 4S–6S depending on mechanism inertia and desired response.
Should I trim the output shaft?
Trimming is optional. If the shaft is exposed or used as a direct mounting point, trimming it flush with the hub can reduce damage from side impacts. Guarded or enclosed mechanisms may not require trimming.
What hubs or mounts work best?
Use robust 6mm bore clamping hubs or weapon hubs designed for combat robotics. Always secure fasteners with threadlocker and avoid leaving the shaft exposed as an impact target.
Does the 27:1 Blitz Pro run hot?
Under normal operation, the motor runs efficiently and cooler than comparable brushed setups. Extended stalls, aggressive braking, or poorly tuned ESC settings can still introduce heat.
Why does the single-stage design matter?
Single-stage reduction reduces internal shock amplification and eliminates common failure points found in multi-stage gearboxes. This improves survivability when mechanisms stall or absorb impact loads.
What does “back-drivable” mean in this context?
The gearbox can tolerate external forces rotating the output shaft without binding. This reduces internal stress when a weapon is struck, stalled, or forced backward during impacts.
Do I need a sensored ESC?
No. The system is sensorless. Consistent startup and control depend on proper AM32 ESC tuning rather than sensors.
How should I configure kV in AM32?
Set kV based on battery voltage. On 6S, configure near the motor’s rated kV. On lower voltages, reduce the kV setting proportionally and fine-tune startup parameters as needed.
How was the motor tested?
Performance figures are based on Prony-brake dyno testing and are intended for relative comparison, not absolute stall torque at zero RPM.
Can I replace individual components?
Replacement shafts and bare Blitz Pro gearboxes are available. Replacement motors are planned and may vary in availability.
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