Quick Answer
Pick your prop size first, then match motor stator size and KV to battery voltage. As prop diameter goes up, KV generally comes down, especially when moving from 4S to 6S. The reference tables below give practical starting points from 1.2 inch whoops through 7 inch long-range builds, so you can choose a safe combo before fine-tuning with thrust data.
FPV Motor Selection Table by Prop Size
This table set is based on the shared reference matrix and reformatted for quick build planning. Use it as a starting point, then confirm current draw against your ESC and battery limits.
1.2–1.6 inch props (Tiny Whoops)
| Prop size | Voltage | Motor sizes | KV range | Prop type; typical pitch & use |
|---|---|---|---|---|
| 31 mm (1.2") | 1S | 0702; 0802 | 23,000–30,000 | Triblad or 2‑blade; very small pitch 1.5–2.0; indoor whoops |
| 40 mm (1.6") | 1S | 0802; 1002 | 20,000–23,000 | Triblad; 1.9–2.3 pitch; 75 mm whoops |
| 40 mm (1.6") | 2S | 0802; 1002; 1102 | 12,000–14,000 | Triblad or 2‑blade; slightly higher pitch for punch |
| 40 mm (1.6") | 3S | 1102; 1103 | 8,000–11,000 | 2‑blade or triblad; high‑KV micro outdoor whoops |
Source: Oscar Liang lookup table for tiny whoops and ultralights.
2.0 inch props (Cinewhoops and toothpicks)
| Prop size | Voltage | Motor sizes | KV range | Prop type; typical pitch & use |
|---|---|---|---|---|
| 2.0" triblade cine | 2S | 1003; 1103 | 11,000–15,000 | 3‑blade ducted; low pitch 2.5–3.5; smooth cinewhoop |
| 2.0" triblade cine | 3S | 1103; 1104; 1203; 1303 | 6,000–7,500 | 3‑blade; higher torque for ducts and heavier frames |
| 2.0" triblade cine | 4S | 1303; 1304 | 5,000–6,000 | 3‑blade; heavier cine setups, more stable thrust |
| 2.0" ultralight | 1–3S | 1002–1105 | 5,000–23,000 (varies) | 2‑blade or 3‑blade; toothpick variants use 2‑blade for efficiency |
Oscar’s table separates cinewhoop (ducted) and ultralight toothpick recommendations — choose triblade for ducts, 2‑blade for max efficiency on tiny toothpicks.
2.5–3.0 inch props (Toothpicks and small freestyle)
| Prop size | Voltage | Motor sizes | KV range | Prop type; typical pitch & use |
|---|---|---|---|---|
| 2.5" triblade | 2S | 1203; 1204; 1303 | ~7,500 | 3‑blade; light ultralight freestyle |
| 2.5" triblade | 3S | 1203; 1204; 1303 | ~6,000 | 3‑blade; more torque for slightly heavier builds |
| 2.5" triblade | 4S | 1404 | ~4,500 | 3‑blade; heavier cine/toothpick 4S setups |
| 3.0" triblade | 2–4S | 1303; 1404; 1407; 1506 | 4,000–5,500 | 3‑blade; common freestyle props 3.0–3.5 pitch |
| 3.0" two‑blade long range | 1S Li‑ion / 2–4S | 1103; 1202; 1203 | 10,000–6,000 | 2‑blade; long‑range efficiency; higher pitch options |
Use 2‑blade props for efficiency and quieter flight; 3‑blade for more immediate thrust and smoother video in cine setups.
3.5–4.0 inch props (Mid‑size freestyle and cine)
| Prop size | Voltage | Motor sizes | KV range | Prop type; typical pitch & use |
|---|---|---|---|---|
| 3.5" triblade / cine | 4S | 1404; 1504; 1604; 2004 | 3,500–4,000 | 3‑blade; cinewhoop / smooth freestyle |
| 3.5" triblade | 6S | 1504; 1604; 2004 | 2,500–3,000 | 3‑blade; higher voltage, lower KV for torque |
| 4.0" triblade | 4S | 2004 | 2,400–3,000 | 3‑blade; agile freestyle |
| 4.0" triblade | 6S | 2004; 2106 | 1,800–2,500 | 3‑blade; efficient 4" 6S builds |
3.5–4" is a flexible band — choose lower KV on higher voltage to keep tip speeds and current sane.
5.0 inch props (Standard freestyle and racing)
| Prop size | Voltage | Motor sizes | KV range | Prop type; typical pitch & use |
|---|---|---|---|---|
| 5.0" triblade racing | 4S | 2207; 2306 | 2,300–2,800 | 3‑blade; 3.5–4.6 pitch; race/aggressive freestyle |
| 5.0" triblade freestyle | 4S | 2207; 2306; 2307 | 2,000–2,300 | 3‑blade; smoother, more torque for freestyle |
| 5.0" triblade racing | 6S | 2207; 2306 | 1,600–2,100 | 3‑blade; lower KV for 6S powerband and efficiency |
Oscar’s recommended KV bands for 5" are the community baseline: higher KV for 4S, lower KV for 6S; choose prop pitch to match flying style.
6.0–7.0 inch props (Long‑range and cruisers)
| Prop size | Voltage | Motor sizes | KV range | Prop type; typical pitch & use |
|---|---|---|---|---|
| 6.0" | 6S | 2306.5; 2507 | 1,300–1,700 | 2‑ or 3‑blade; efficient long‑range props; moderate pitch |
| 7.0" | 6S | 2507; 2810 | ~1,100–1,800 | 2‑ or 3‑blade; long‑range / cruiser; lower KV for endurance |
6–7" recommendations vary with AUW and prop pitch — Oscar lists typical motor families and KV bands used in common long‑range builds.
How to use these tables for a real build
1. Start with prop and voltage — pick the prop diameter and the battery cell count you plan to run.
2. Choose motor size and KV from the table — use the KV band for your voltage and the motor stator sizes listed.
3. Check prop type and pitch — triblade for responsiveness and smoother video; two‑blade for efficiency and quieter flight.
4. Validate with thrust/current charts — for 3" and up, confirm motor + prop + voltage in a manufacturer test chart or eCalc to ensure hover throttle and current draw are acceptable.
How to Pick the Right Motor in Practice
- Lock prop size and cell count first. Decide the frame and battery platform before choosing motor KV.
- Pick a motor stator family from the table. For example, 5 inch freestyle usually lands around 2207 to 2307.
- Choose KV by voltage and flying style. Higher KV gives more snap, lower KV gives smoother control and better efficiency.
- Validate with thrust and current charts. Check full-throttle amps against ESC rating and leave thermal headroom.
Useful Links for Matching Motors and Components
If you are comparing KV bands, read our motor KV ratings guide. If you want a refresher on motor basics, see what brushless motors do in FPV drones.
For a proven 5 inch freestyle setup, the iFlight XING2 2207 2050KV is a solid reference point. If you are building a punchy smaller race setup, the XNova Lightning T2203.5 2800KV set is worth a look.
You can browse more options in our brushless motors collection and paired drivetrain parts in motors and ESC.
FAQ
Q: Should I always use lower KV on 6S?
A: Yes, in most cases. Higher voltage increases motor speed potential, so KV usually needs to come down to keep current and motor temperature under control.
Q: Is triblade always better than two-blade?
A: Not always. Triblades usually feel grippier and smoother in turns, while two-blades are often more efficient and quieter for long-range builds.
Q: Can I run 5 inch race KV for freestyle?
A: You can, but expect higher current draw and a sharper throttle feel. Freestyle pilots often choose slightly lower KV for smoother control and better battery life.
Q: How accurate are these ranges?
A: They are practical starting ranges used by many pilots. Final choice should always be confirmed with motor test data, AUW, and prop pitch.