Quick Answer
The 0702 motor is smaller and lighter, which suits light, short-flight-time whoops focused on agility. The 0802 motor has a bigger stator, so it produces more thrust and torque, at a small weight cost. Pick 0702 for the lightest, most flickable builds, and 0802 when you want more punch or plan to fly a slightly heavier whoop with an HD camera.
What the Numbers Mean
BETAFPV names its whoop motors by stator size, the same system used across the FPV motor industry. The first two digits are the stator width in millimeters, and the last two are the stator height. So a 0702 motor has a 7mm wide, 2mm tall stator, and an 0802 motor has an 8mm wide, 2mm tall stator.
That difference sounds small, but at whoop scale it matters a lot. More stator width means more copper winding and more magnetic force, which directly increases the torque and thrust a motor can produce.
Stator Size and Weight Differences
The 0802 stator is a little larger, so the motor itself weighs a bit more. On a full whoop, this usually adds only a gram or two across all four motors, but at whoop weights (often under 40 grams total), even small changes are noticeable in handling.
| Feature | 0702 | 0802 |
|---|---|---|
| Stator size | 7mm x 2mm | 8mm x 2mm |
| Typical weight per motor | Lighter | Slightly heavier |
| Torque | Lower | Higher |
| Best for | Lightest, most agile whoops | Punchier whoops, small HD cameras |
Power and Flight Time Trade-Offs
More stator size generally means more available thrust, which can mean sharper acceleration and better recovery from bumps and walls, common in whoop flying. But bigger motors also draw more current at the same throttle input, which can shorten flight time on the small 1S batteries whoops use.
The 0702 motor draws less current for a given throttle position, so it tends to stretch a small battery further. This makes it popular for pilots who want the longest possible flight times and the lightest possible build, especially for indoor freestyle where agility matters more than raw power.
The 0802 motor trades a bit of that flight time for more headroom. If you fly outdoors in light wind, or you added a small HD camera and your whoop is a little heavier than stock, the extra torque of the 0802 helps the quad keep good control authority instead of feeling underpowered.
KV Options and What They Change
Both motor sizes come in multiple KV ratings. Within the same stator size, a higher KV version spins the prop faster for a given voltage, giving snappier feel but pulling more current. A lower KV version feels smoother and often lasts longer per charge.
If you are new to what KV means and how it interacts with prop size, the guide on motor KV explained covers the basics in plain terms. For whoops specifically, matching KV to your exact prop size and battery matters even more than on larger builds, because the margin for error is smaller.
Which Whoop Setups Suit Each Motor
Choose 0702 motors if:
- You want the lightest possible whoop for tight indoor spaces.
- Flight time matters more to you than raw punch.
- You fly mostly stock, without adding a heavier HD camera.
- You are still learning and prefer a calmer, more forgiving feel.
Choose 0802 motors if:
- You added a small HD camera or other extra weight to your whoop.
- You want stronger recovery power after clipping walls or furniture.
- You fly outdoors sometimes, where light wind needs more control authority.
- You prefer a punchier feel and can accept slightly shorter flight time.
Checking Compatibility Before You Buy
Motors alone are not the full picture. Before swapping motor sizes on an existing whoop, check three things: the frame's motor mount holes must match the new motor's mounting pattern, the props must suit the new stator size and KV, and the flight controller and ESC must handle the current draw of the new motors.
If you are building or setting up a whoop from scratch rather than upgrading one, the BETAFPV Air75 II setup guide walks through binding, Betaflight basics and battery care for this class of drone. And if you are still deciding between a tiny whoop and a larger first drone, choosing your first FPV kit compares the options.
A Simple Way to Decide
Think about what frustrates you most in your current flying. If you keep running out of battery too soon, lean toward 0702 motors and keep the build light. If you keep feeling like the quad cannot punch out of trouble fast enough, lean toward 0802 motors and accept a bit less flight time.
Neither motor is "better" in every case. They are tuned for slightly different goals, and the right choice depends on your flying style and what you already have on your whoop.