TZI

Firfir Range / Endurance Calculator

An aircraft example using the July 3 flight data and a Zeng-inspired power model

Explore the author's aircraft. Adjust the controls to see how the fitted power curve translates into range and endurance. The shaded speed interval contains the source flight's fitted bins; values outside it are extrapolations. The red points always describe the source aircraft.

This fit comes from one aircraft. Please fit your own flight logs before forecasting your aircraft's flights. See the Python workflow for all three models.

Aircraft assumptions and provenance

Adapted from the author's July 28 HTML dashboard, retaining its controls and Zeng model. This public copy uses the current Python G29 / 12.4 kg source fit and the later entered configuration: four U8 Lite KV190 motors, G29×9.5 propellers, 450 cm², and two 6S 27 Ah packs.

The 1,198.8 Wh nominal battery is scaled by 25.2/27 to 1,118.88 Wh usable energy. A further 10% reserve leaves 1,006.992 Wh for the displayed flight. The approximately 1,485.7 W hover value retains the author's historical ESC-sum ×2 / G28 motor-table calibration; it is a conditional electrical scenario, not an independently verified whole-aircraft measurement. The Bauersfeld CF of approximately 0.616 belongs to the separate preflight estimate and is not applied here.

Changing mass or propeller transfers the aerodynamic coefficients using the Python Zeng equations. The area control retains the original additive CdA adjustment (effective Cd = 1), referenced to 450 cm². The LiHV option uses the Python empirical energy basis of 3.7 × 7/6 V per cell. Other motors use the original approximate RPM lookup; motor tables clamp outside their measured thrust ranges. Use these controls for exploration, then measure your own hover power and fit your own logs.

Aircraft & System Configuration

Motor / Propeller Set 29.0"

Total Mass (kg) 12.4 kg

Reference Area (cm²) 450 cm²

Battery Pack Configuration

Packs (in Parallel)

Cells in Series per Pack

Capacity per Pack (mAh)

Cell Voltage Basis

Hover Power

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Best-Range Speed

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Max Range (10% reserve)

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Usable Energy Before Reserve

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July 3 Fit — Zeng P(v)/P_hover 0.1–25 m/s

— Zeng Fit ● Source-aircraft bins

Aircraft & System Configuration

Battery Pack Configuration

July 3 Fit — Zeng P(v)/P_hover 0.1–25 m/s

Range & Endurance vs Speed 10% reserve · Zeng Fit