Tools // Component Selector // Amax
Amax 1303 KV4000
hobby fpv brushless motor. Specs read from manufacturer page ↗.
estimated Thrust here is modelled from rated power and propeller diameter via momentum theory, not measured. Indicative only, so do not compare it like-for-like against measured figures.
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Specifications
| Brand | Amax |
|---|---|
| Model | 1303 |
| Variant | KV4000 |
| KV | 4,000 |
| Stator | 1303 |
| Weight | 8 g |
| Max thrust | 411 g |
| Test propeller | 2.7" (assumed) |
| Max power | 250 W |
| Poles | 9 |
| Shaft diameter | 1.5 mm |
| Hover efficiency | 2.32 g/W |
| Grade | hobby |
| Application | fpv |
| Data confidence | reported |
| Thrust basis | modelled |
| Efficiency basis | modelled |
| Measured test points | 0 |
Where to buy
| Vendor | Price | As listed | Stock | Lead days | |
|---|---|---|---|---|---|
| DrUAV CN | A$40.60 | USD 28.25 | backorder | 48 | buy ↗ |
Multi-pack listings are shown at their per-unit price so they stay comparable.
Compatible accessories
Parts this catalogue holds that fit this component, and the evidence behind each pairing. Fit is inferred from published specifications, not from having tried it. Confirm mounting and clearance before you buy.
stated The accessory listing names this component by size.
| Accessory | Type | From |
|---|---|---|
| iFlight 2" propeller | propeller | A$28.59 |
rule of thumb The size conventionally run on a stator this big. Not a measurement -- check clearance and current draw before flying it.
| Accessory | Type | From |
|---|---|---|
| Gemfan 2.5" propeller | propeller | A$1.45 |
| Gemfan 2.9x2.5 5-blade propeller | propeller | A$1.49 |
| HQProp 2.9x2.9 4-blade propeller | propeller | A$2.75 |
| HQProp 2.8x1.6 3-blade propeller | propeller | A$3.95 |
| HQProp 2.8x2.4 3-blade propeller | propeller | A$3.95 |
| HQProp 2.5x2 3-blade propeller | propeller | A$4.30 |
| Phaserfpv 2.5x3.5 3-blade propeller | propeller | A$4.95 |
| HQProp 2.5" propeller | propeller | A$5.69 |
| HQProp 2.8x2.6 3-blade propeller | propeller | A$5.95 |
| HQProp 2.5x2.5 3-blade propeller | propeller | A$5.95 |
| HQProp 2.9x2.7 3-blade propeller | propeller | A$5.95 |
CAD model
No CAD model linked yet.
How the metrics are calculated
TWR is max thrust divided by motor weight, motor only, static, excluding propeller and ESC. EFTWR scales that by hover efficiency and RPM headroom, so it equals TWR for a motor at 8 g/W and 10,000 RPM. Full methodology and the whole catalogue →