Calculator Inputs
The page stays single-column overall, while inputs use a responsive 3-column, 2-column, and 1-column grid.
Example Data Table
These rows are illustrative examples only and help users understand realistic input combinations.
| Scenario | Method | Cruise Speed | Wind | Key Inputs | Illustrative Range |
|---|---|---|---|---|---|
| Regional fuel-planning case | Direct Fuel Flow | 430 kt | +10 kt | 5,200 gal fuel, 750 gal/hr burn, 8% reserve | 2,721 nm |
| Medium jet cruise estimate | Breguet Jet | 470 kt | -15 kt | 154,000 lb takeoff, 101,000 lb destination, L/D 16 | 3,470 nm |
| Turboprop mission estimate | Breguet Propeller | 165 kt | +5 kt | 7,800 lb takeoff, 5,600 lb destination, ηp 0.82 | 862 nm |
Formula Used
This calculator supports three engineering-style planning approaches. Each method is simplified for estimation, not certification or dispatch release authority.
1) Direct Fuel Flow Mission Model
This method is practical when operators know real mission fuel flow and want a planning answer after reserve deductions.
2) Breguet Jet Range Model
This model is useful when aerodynamic efficiency and weight ratio are known more accurately than fuel flow.
3) Breguet Propeller Range Model
This adds propeller efficiency to the Breguet-style estimate for prop-driven aircraft.
How to Use This Calculator
- Select the calculation method that best matches your available data.
- Enter cruise speed and wind component first.
- Add payload penalty and mission margin if you want a more conservative answer.
- For direct planning, enter fuel, burn rate, reserve percent, and other mission deductions.
- For Breguet planning, enter weights, fuel consumption, and aerodynamic efficiency values.
- Click Calculate Flight Range to show the result above the form.
- Review the summary table and Plotly graph for sensitivity to wind changes.
- Use the CSV and PDF buttons to save the result summary.
Frequently Asked Questions
1) Which method should I use first?
Use the direct fuel-flow method when you know fuel burn well. Use a Breguet model when you have good aerodynamic and weight data and want a cruise-focused engineering estimate.
2) Is this suitable for dispatch release or certification work?
No. This is a planning and educational estimator. Certified performance, regulatory reserves, manufacturer data, and approved dispatch procedures always take precedence over simplified calculations.
3) Why does headwind reduce range so much?
Headwind lowers ground speed while fuel consumption or weight-ratio behavior remains similar. You cover less distance during the same endurance window, so final range falls quickly.
4) What does payload penalty mean here?
It is a practical correction factor for extra drag, higher operating weight, or other payload-driven mission effects that are not fully modeled by the simplified formulas.
5) Why use mission margin separately?
Mission margin is a final conservative reduction. It helps cover operational uncertainty such as routing inefficiency, atmospheric variation, or company planning buffers without changing the raw formula inputs.
6) Can I use negative wind values?
Yes. Enter negative wind values for headwind and positive values for tailwind. The calculator automatically adjusts ground speed and the final mission range estimate.
7) Why does the Breguet model use logarithms?
Because aircraft weight decreases as fuel burns. The logarithmic term captures how changing weight affects range more realistically than a simple constant-fuel linear estimate.
8) Can I export the results?
Yes. After calculating, use the CSV button for spreadsheet-friendly output or the PDF button for a printable summary document of the key results.