Toolbox
Two power options — pick the one that fits your build
The BOOMFPV（炸机大叔） 1505 brushless motor is offered in 2350KV and 3810KV. 2350KV is for 6S power setups; 3810KV is for 4S. Confirm the battery and KV first, then match propellers, frame space, and all-up weight so the build has a clear direction.
Choosing propellers and a frame size
2350KV may be used as a reference on 2.5–4 inch builds; 3810KV on 2.5–3.5 inch builds. Those ranges come from the supplied propeller-load data. You still need to check propeller load, ESC, battery, all-up weight, and hole pattern together. Not every airframe of the same size will be a direct fit.
Read the load data with the test conditions
The load charts above list voltage, current, power, and thrust for different propellers, so you can compare combinations. The 2350KV figures come from the supplied SIRIUS1505 2350KV data. For 3810KV, by the confirmed model mapping, the supplied SIRIUS1505 3800KV table is used as a reference. Real-world results change with the propeller, battery, and how the aircraft is built.
Check the dimensions before you install
The dimension drawing lists an outer diameter of 20.83mm and an overall axial length of 19.2mm. The base mounting pattern is 4-M2 on a 12mm pitch circle; the prop end is 4-M2 on a 5mm pitch circle. Before installation, check the frame holes, how the propeller is secured, and screw length. The drawings are a selection reference; machining and installation should follow the original engineering drawing and the physical motor.
It looks the part, and it is meant for day-to-day use
From the bell shape to the base details, this photo set shows the motor from several angles. The product is designed around balance, flight feel, durability, and everyday value, for pilots who care about build and maintenance cost. Choose a matched power combination, then tune it until it feels right.
Price
The 2350KV and 3810KV options are sold separately. Confirm the KV option, quantity, and packing list when ordering.