SPIDER Automation | X-Type Aluminum Motor Cross Mount Plate | Firewall Mounting Bracket Set for 22XX Brushless Outrunner Motors
The SPIDER Automation X-Type Aluminum Motor Cross Mount Plate Set (Model: 22XX-ALU-CROSS-MOUNT) is a premium structural hardware solution engineered for fixed-wing model airplane builders, RC aircraft enthusiasts, and robotics developers utilizing 22XX series brushless outrunner motors. Mounting high-KV outrunner motors—which rotate their entire outer bell assembly—to a flat model firewall requires an uncompromising, rigid bracket that aligns the motor shaft centrally while absorbing continuous operational torque and propeller thrust loads. Plastic motor mounts can warp or fatigue under prolonged heat and vibration; this high-strength aluminum alloy cross mount provides a permanent, vibration-resistant mechanical bridge between the motor backplate and the aircraft bulkhead.
Precision-machined from high-grade aluminum and finished in a clean protective metallic coating, each cross mount weighs an astonishing 1.5 grams by itself (only 2.4 grams with 4 mounting bolts). The backplate features precision-drilled mounting slots with 16mm and 19mm center-to-center hole spacings in opposing directions, matching standard industrial bolt circles found on popular outrunner brands including Scorpion, Hacker A20, AXI, GWS, and Waypoint 22mm motors. Supplied as a convenient 2-pack complete with 8 mounting bolts, this hardware set enables fast, secure installation across balsa wood, plywood, and foam composite model airframes.
Product Overview & Functional Design
The 22XX-ALU-CROSS-MOUNT bracket system is designed to solve common motor installation challenges in RC model aviation and custom robotics where structural rigidity is paramount. When converting traditional glow-plug aircraft to electric brushless power, or assembling high-speed park flyers and FPV wings, achieving proper propeller shaft alignment and firewall spacing is critical.
The X-shaped frame geometry distributes thrust forces evenly across four anchor points on the aircraft bulkhead, preventing localized stress fractures in lightweight plywood or foam firewalls. Its rugged metal composition provides exceptional torsional rigidity, ensuring that the motor angle remains locked true even under rapid throttle punches, high-speed dives, and heavy aerobatic loads.
Technical Features & Functional Characteristics
- Optimized 22mm Motor Fit: Specifically contoured to mount flush against the rear backplate of 22mm diameter brushless outrunner motors.
- Standardized Dual-Pitch Hole Spacing: Features 16mm and 19mm center-to-center mounting hole dimensions for broad cross-brand motor compatibility.
- High-Strength Aluminum Alloy: Precision-milled from durable metal alloy capable of absorbing heavy landing impacts and continuous high-RPM vibration.
- Rigid X-Arm Geometry: Four-point arm structure resists bending and twisting moments generated by high-power brushless motors.
- Complete 2-Pack Value Bundle: Includes two X-type aluminum cross mount plates and eight 3mm machine screws in every package.
- Corrosion-Resistant Metal Finish: Protected against atmospheric oxidation, humidity, and operational fuel residue.
- Featherlight Airframe Mass (1.5g per mount): Ultra-low weight preserves the center of gravity (CG) and overall thrust-to-weight ratio.
- Firewall Bulkhead Mounting Tabs: Extended outer mounting tabs allow secure screw attachment to aircraft firewall formers.
Mechanical Load Dynamics & Thrust Transfer
In brushless outrunner motor applications, thrust generated by the propeller pushes forward against the motor shaft and backplate, creating a continuous axial load combined with radial torque from motor rotation. Flexible or poorly designed plastic motor mounts can warp under these forces, causing propeller misalignment, rubbing against cowlings, and severe power loss.
The 22XX-ALU-CROSS-MOUNT channels these opposing forces directly into the aircraft’s structural firewall with zero mechanical deflection. The reinforced center hub absorbs the primary shaft thrust load, while the four radiating arms distribute rotational torque across a wide diameter, ensuring rock-solid stability throughout high-speed flight.
System Compatibility & Brand Versatility
Thanks to its standardized multi-pitch mounting geometry, the 22XX-ALU-CROSS-MOUNT fits a wide array of commercially available brushless outrunner motors:
- Scorpion 22mm Outrunners: Direct bolt-on compatibility with Scorpion commercial brushless motors.
- Hacker A20 Series: Perfectly aligns with Hacker A20-22L, A20-20S, and related outrunner backplate hole patterns.
- AXI 22mm Outrunners: Compatible with AXI 2203, 2208, and 2212 gold-line brushless motors.
- GWS & Waypoint 22mm Motors: Matches standard 16/19mm hole spacings used across legacy and modern outrunners.
- Generic 2204, 2208, 2212, 2216 Motors: Universal fit for standard drone and airplane brushless motors utilizing 16×16mm or 19×19mm mounting footprints.
Applications
This versatile aluminum motor cross mount is an essential structural mounting accessory across multiple hobbyist and robotics platforms.
- Fixed-Wing Park Flyers & Foamies: Mounting 22XX outrunners to depron foam and EPS model firewalls.
- Balsa Wood Scale Model Airplanes: Securing electric brushless motors to wooden motor bulkheads in traditional balsa kits.
- RC Gliders & Powered Sailplanes: Nose-cone motor mounting bracket for electric glider power pods.
- Custom FPV Fixed-Wing Aircraft: Pusher and tractor motor mount installations on long-range mapping planes.
- Autonomous Mobile Robots (AMR): Rigid mounting bracket for custom motorized drive wheels and auxiliary actuators.
- Unmanned Ground Vehicles (UGV): High-torque motor mounting plate for experimental electric rovers.
- Propulsion Test Benches: Secure motor test-stand mounting bracket for measuring thrust and efficiency in R&D labs.
- STEM & University Aerodynamics Labs: Standardized motor mount for student-built aircraft and drone engineering projects.
- Model Boat & Marine Propulsion: Bulkhead motor mount for small electric RC scale boats and airboats.
- Industrial Micro-Actuator Mounts: Rigid mechanical adapter plate for small motorized industrial jigs and test fixtures.
- Ducted Fan (EDF) Support Brackets: Auxiliary mounting framework for micro ducted fan propulsion units.
- DIY Electric Mobility Prototyping: Mounting bracket for small motorized mechanical prototypes.
Package Includes
- 2 × SPIDER Automation X-Type Aluminum Motor Cross Mount Plates (Model: 22XX-ALU-CROSS-MOUNT)
- 8 × 3mm Mounting Bolts / Machine Screws
Product Specifications
| Parameter | Specification |
|---|---|
| Brand / Distributor | SPIDER Automation |
| Model Number | 22XX-ALU-CROSS-MOUNT |
| Product Type | X-Type Aluminum Brushless Motor Cross Mount Plate / Firewall Bracket Set |
| Compatible Motor Series | 22XX Series Brushless Outrunners (2204, 2208, 2212, 2216) |
| Mounting Hole Spacings | 16 mm & 19 mm Center-to-Center (Multi-Directional Pattern) |
| Mounting Compatibility | Scorpion, Hacker A20, AXI, GWS, Waypoint, and Generic 22mm Outrunners |
| Material Composition | High-Strength Precision-Milled Aluminum Alloy |
| Surface Finish | Silver / Electro-Coat Protective Coating |
| Primary Functions | Firewall motor mounting, thrust load transfer, torque dissipation, shaft alignment |
| Operating Temperature Range | -40°C to +120°C |
| Single Mount Net Weight | 1.5 g (2.4 g with 4 mounting screws) |
| Total Set Weight | 4 g (Combined mounts and screws) |
| Shipping Package Weight | 0.005 kg (5 grams) |
| Shipping Dimensions (L × W × H) | 5 cm × 5 cm × 2 cm |
Installation & Mounting Guidelines
Standard mechanical assembly practices should be observed when installing the aluminum motor cross mount to your aircraft firewall.
- Motor Backplate Alignment: Align the center mounting holes of the aluminum cross mount with the rear threaded mounting holes on your 22XX brushless outrunner motor backplate.
- Motor Screw Fastening: Secure the cross mount to the motor using the provided 3mm machine screws. Apply a small drop of blue threadlocker (Loctite) to screw threads to prevent loosening from high-RPM motor vibration.
- Firewall Positioning: Center the motor assembly against your aircraft firewall or motor bulkhead, ensuring proper propeller clearance and right-thrust/down-thrust angles if required.
- Bulkhead Securing: Fasten the outer cross-arm tabs firmly to the firewall using wood screws, blind nuts, or machine bolts depending on your aircraft construction (balsa, plywood, or composite).
- Shaft Clearance Check: Ensure the rotating outer bell of the outrunner motor and the propeller adapter clear the cross mount arms and firewall structure completely before powering up.
