Enter your motor KV, prop pitch, and battery — get estimated top speed, flight time, and thrust-to-weight. Compare motors side by side.
Built for 65–85mm whoops — accuracy calibrated against real whoop builds. Not for 5-inch quads.
Top speed uses a drag-equilibrium model: effective motor RPM under load (not free-spin RPM) sets a pitch-speed ceiling, then aerodynamic frame drag — which grows with the square of velocity — determines where thrust and drag balance. Small whoops spin at a much lower fraction of no-load RPM than 5"+ quads because tiny high-KV motors drop significantly under electrical load, which is why naive pitch×RPM formulas drastically overestimate whoop top speeds.
Flight time is modeled from your battery capacity, an 80% usable discharge window (to protect cell health), and an estimated average current draw based on frame size and motor specs — tuned for aggressive freestyle flying rather than gentle cruising.
Thrust-to-weight uses community static-thrust benchmarks for common motor/prop/cell combinations at each frame size, since true thrust requires a bench test rig. A ratio above 2:1 is generally freestyle-capable; whoops often run lower due to prop and motor constraints at their scale.
| Pitch | Est. Top Speed |
|---|
KV and cell count are linked. KV is how fast the motor spins per volt. More cells means lower KV to keep your prop RPM in a useful range without over-spinning. Rule of thumb for 5" props: 4S builds use 2300–2450KV; 6S builds use 1700–1950KV. Going too high on KV for your voltage generates heat and shortens motor life.
Stator size sets the torque ceiling. The four-digit stator number tells you everything — "2207" means 22mm diameter, 7mm tall. Wider diameter adds torque and power but also weight. For 5" freestyle a 2207 or 2306 hits the sweet spot. For long range, a taller stator (2807, 2808) provides more torque to spin larger props at lower RPM efficiently.
Match thrust-to-weight to your flying style. Casual freestyle and cruising works well at 4:1–6:1. Aggressive freestyle pilots often target 8:1–12:1 for snappy response. Long range builds prioritize efficiency over punch — 3:1–5:1 is typical. Whoops are size-constrained and land wherever the motor and prop math allows.
Don't cheap out on C-rating. An underpowered battery sags badly under load, robbing motor performance and degrading cells quickly. For 5" freestyle on 6S, target at least 50C continuous on a 1300mAh pack — or a 1100mAh 100C pack for cleaner power delivery. Use the battery calculator in the Tools section to check your specific pack against your estimated peak draw.
Pure indoor build. Every gram matters — 0702 motors weigh under 2g each. Prioritize motor weight and efficiency over raw power output.
The Mobula7 class — typically flown 1S or 2S depending on the build and pilot preference. More versatile than 65mm, handles light outdoor wind. A good first whoop for pilots coming off simulators.
85mm whoops typically run 1103 motors on 2S. Bridge between micro whoop and toothpick — more punch than a 75mm, still indoor-capable.
Genuine 3" toothpick — open props, no guards, outdoor only. More speed and range than any whoop class, but too exposed and too fast for tight indoor spaces. Bridges the gap between whoops and full 5" freestyle.
The dominant class with the widest ecosystem. On 6S use 1700–1950KV; on 4S use 2300–2450KV. Nearly all freestyle content you see online is 5".
Built for distance, not punch. Lower KV and larger props maximize propulsive efficiency. Common with GPS, long-range links (ELRS), and HD cameras.
Betaflight PID tunes, rates, and filter settings for 65mm-85mm whoops — stock profiles and RyFly's pilot-tested tunes for BetaFPV, Happymodel, and NewBeeDrone flight controllers.
VIEW TUNE DATABASE →Built by RyFly — FPV pilot & IGOW competitor.
Free browser-based FPV flight simulator with real Betaflight rates, acro and angle mode, a 3-lap race course, and TX16S/EdgeTX radio support.
EXPLORE THE SIMULATOR →RyFly is a competitive FPV freestyle pilot out of Mesa, Arizona — meet the pilot behind QuadMath and see his current competition whoop builds plus his picks for motors, props, batteries, and goggles.
MEET RYFLY & SEE THE GEAR →Available for FPV freestyle filming, event appearances, and social media content — based in Mesa, Arizona and open to travel for the right project.
WORK WITH RYFLY →