FPV & UAV FLIGHT LOGIC

HoverLogic

The FPV Drone & LiPo Battery Flight Time Engine

QUICK PRESETS:

Battery & Flight Parameters

mAh
C
A
A
50%
0% Hover 25% Cruise 50% Freestyle 80% Racing 100% Full Punch
20%
10% (Hard Limit) 20% (Standard 80% Rule) 30% (High Margin)

Thermal & Discharge Telemetry

NORMAL
✅
Safe C-Rating Margin

Peak current draw is within continuous battery limits.

Flight Time & Energy Metrics

ESTIMATED FLIGHT TIME
0m 52s
At 50% Duty Cycle (72.5A Avg)
PURE HOVER TIME
2m 30s
100% Stationary Station Keeping
FULL THROTTLE BURST
0m 31s
Continuous 100% Throttle Draw
USABLE PACK ENERGY
23.1 Wh
1.04 Ah Usable (80% Limit)
AVERAGE CURRENT DRAW
72.5 A
1,610 Watts Avg Power
BATTERY DISCHARGE LIMIT
130.0 A
Peak Load: 92% of Continuous C

Battery Capacity Reserve Allocation

Usable Capacity (80% — 1040 mAh)
Safety Reserve (20%)
Total Nominal Pack: 28.9 Wh (1.30 Ah) Full Charge Voltage: 25.20V (4.20V/cell) Storage Voltage: 23.10V (3.85V/cell)

Flight Profile Matrix & Aggression Spectrum

Flight Style Duty Cycle Avg Amps Estimated Flight Time Pack Thermal Load

Mastering LiPo Battery Flight Dynamics & C-Rating Realities

In multirotor aerodynamics and FPV quadcopter engineering, flight endurance is governed by the delicate relationship between total battery mass, instantaneous current draw (Amps), and usable chemical energy (Watt-hours). Unlike fixed-wing aircraft that benefit from passive aerodynamic lift generated by wings, multirotors rely on constant propulsive thrust to counteract gravity. As a result, battery sizing requires balancing available energy density against the thermal stress imposed on lithium polymer (LiPo) cells.

The Golden 80% Discharge Rule

Lithium polymer cells degrade rapidly when discharged below about 3.5V per cell under load or when resting below 3.7V. Discharging a pack past 80% of its rated milliamp-hour (mAh) capacity causes permanent internal resistance (IR) growth, cell swelling ("puffing"), and rapid voltage sag during throttle spikes. HoverLogic enforces the standard 80% usable capacity safety threshold so your packs maintain high punchout performance across hundreds of charge cycles.

Understanding Continuous C-Ratings vs. Marketing Claims

A battery's C-Rating denotes its maximum safe continuous discharge rate relative to its total capacity. A 1300mAh (1.3Ah) pack rated at 100C theoretically delivers up to:

Max Safe Amperes = 1.3 Ah × 100 C = 130 Amperes

However, many battery vendors print inflated burst ratings on pack labels. If your quadcopter's four motors draw 140A during full throttle punchouts on a pack rated for only 130A continuous, severe voltage sag occurs, triggering low-voltage telemetry warnings even on a freshly charged battery.

LiPo vs. LiHV vs. Li-ion Chemistry Differences

  • Standard LiPo (3.7V Nominal / 4.20V Full): High power density and rapid discharge capability; ideal for FPV freestyle and racing quadcopters.
  • LiHV High Voltage (3.8V Nominal / 4.35V Full): Provides 8-10% more initial watt-hours per pack and higher initial voltage top-end; popular for competitive racing and cinewhoops.
  • Li-ion 18650 / 21700 (3.6V Nominal / 4.20V Full): Lower C-rating (roughly 2C for the high-capacity cells used in long-range packs, up to about 10C for dedicated high-drain cells) but significantly higher energy density (Wh/kg); essential for long-range exploration drones.

How HoverLogic Computes Mixed Duty Flight Time

Real-world flight rarely occurs at a constant hover throttle. HoverLogic models your flight profile using a weighted duty cycle (Aggression slider):

Average Amperes = HoverAmps + (MaxAmps - HoverAmps) × (Aggression% / 100)

Usable flight time in minutes is calculated from usable capacity:

Flight Minutes = (Usable Capacity Ah / Average Amps) × 60

Frequently Asked Questions

LiPo flight time is the usable pack capacity divided by average current draw. Usable capacity is not the full rating: discharging below roughly 20% remaining damages the cells, so a 5000 mAh pack yields about 4000 mAh of flight. This tool converts pack capacity, discharge limit, and average current into realistic flight minutes.

Why should I only use 80% of a LiPo pack's capacity?

Lithium polymer cells degrade rapidly when taken below about 3.5V under load or 3.7V at rest. Reserving 20% keeps the pack above that threshold, protects cycle life, and leaves margin for a go-around. Packs routinely run flat swell, lose capacity, and become a fire risk.

How do I estimate average current draw?

Measure it — average draw depends far more on flying style than on any specification. A watt meter inline during a typical flight, or current telemetry logged to your transmitter, gives a real figure. Hover current on a multirotor is a reasonable floor, but aggressive flying can double it.

What does the C rating actually limit?

C rating is the maximum sustained discharge current, calculated as C × capacity in amp-hours. A 5000 mAh 30C pack supports 150 A continuous. It sets the ceiling on current, not on flight duration — a higher C rating does not extend flight time and usually adds weight.