How to choose the right ESC for an RC aircraft
ESC selection by maximum current, voltage, BEC, safety margin, cooling, connector choice and the real load from motor and propeller.
Firma Sensored Brushless Motor ESC / 2800Kv 2-in-1 Combo is a Spektrum product intended for surface RC vehicles, crawlers, bashers and race setups that need dependable Spektrum control electronics. This page presents the practical buying information a customer needs before ordering: fit, SKU, image, category, specifications and usage advantages.
The content is written for purchasing through RC-MODEL, without supplier prices or links to competing stores.
These guides explain the setup, safety checks and accessory choices that usually matter for this product type.
ESC selection by maximum current, voltage, BEC, safety margin, cooling, connector choice and the real load from motor and propeller.
How to match motor, ESC, LiPo battery and propeller as one complete RC aircraft power setup instead of choosing parts separately.
A step-by-step safety guide for measuring amps, watts and voltage sag so customers avoid overheating motors, ESCs and LiPo batteries.
A guide to receiver and servo power: internal ESC BEC, external UBEC, receiver battery, redundancy and large aircraft safety decisions.
Cell count, capacity, C rating, connectors, battery weight and realistic flight time explained for RC aircraft buyers.
| Technical Specifications | |
| Manufacturer | Spektrum |
| Brand | Spektrum |
| Product Code | SPMXSEM0502 |
| Spektrum Category | Cars & Trucks / Parts, Electronics & Accessories / Electronic Speed Controls |
| Connector Type | IC2 |
| Product Family | Spektrum telemetry and sensor range |
| Application | 1/16-1/18 Rock Crawler |
| Compatibility Focus | Check model fit, connector type, voltage range and Spektrum protocol compatibility before ordering. |
| Number of Cells | 2-3S LiPo, 6-9 Cells NiMH |
| BEC Voltage | 6V/7.4V Adjustable |
| Maximum Continuous Current | 30A /80A |
| Product Height | 2" (51 mm) |
| Product Length | 4.2" (107 mm) |
| Product Weight | 2.7oz |
| Product Width | 3" (76 mm) |
| BEC Continuous Current | 4A |
| Motor Type | Brushless |
| Product Application | Crawling |
| Motor Size | Motor Diameter: 24 mm Length: 45.8 mm |
| Number of Poles | 4 |
| RPM/Volt (Kv) | 2800Kv |
| LiPo Compatibility | 2S, 3S |
| Shaft Diameter | 2.3" (58 mm) |
| Shaft Length | 0.54" (13.7 mm) |
| Sensored | Yes |
Tags: Spektrum, SPMXSEM0502, Spektrum telemetry and sensor range, Spektrum Catalog, Spektrum ESCs, Spektrum Surface Electronics, RC-MODEL
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