1. What is Distance To Clear 35 Ft Obstacle?

Distance To Clear 35 Ft Obstacle is defined as the distance required to clear an 11 m (35 ft.) imaginary obstacle on the runway. It's a critical parameter in aircraft takeoff performance calculations.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( D_{35} \) — Distance to Clear 35 ft Obstacle (m)
• \( CL \) — Clearway Distance (m)
• \( s_{LO} \) — Liftoff Distance (m)

Explanation: Clearway Distance is the difference between takeoff distance available (TODA) and takeoff run available (TORA). Liftoff Distance is the portion of the takeoff procedure during which the airplane is accelerated from a standstill to an airspeed that provides sufficient lift for it to become airborne.

3. Importance of D₃₅ Calculation

Details: Accurate calculation of Distance to Clear 35 ft Obstacle is crucial for aircraft takeoff performance assessment, runway length requirements, and ensuring safe takeoff operations, especially when obstacles are present near the runway.

4. Using the Calculator

Tips: Enter Clearway Distance in meters and Liftoff Distance in meters. Both values must be valid non-negative numbers.

5. Frequently Asked Questions (FAQ)

Q1: Why is 35 ft used as the obstacle clearance height?
A: 35 ft (11 m) is a standard obstacle clearance height used in aviation regulations to ensure aircraft have sufficient clearance from obstacles during takeoff.

Q2: What is the relationship between Clearway Distance and runway parameters?
A: Clearway Distance is the difference between takeoff distance available (TODA) and takeoff run available (TORA), representing the additional area beyond the runway that can be used for takeoff.

Q3: How does Liftoff Distance affect the overall takeoff performance?
A: Liftoff Distance determines how much runway is needed for the aircraft to become airborne, which directly impacts the total distance required to clear obstacles.

Q4: Are there any limitations to this calculation method?
A: This calculation provides an estimate and should be verified with actual aircraft performance data, environmental conditions, and regulatory requirements for specific aircraft types.

Q5: How do different aircraft types affect these calculations?
A: Different aircraft have varying performance characteristics, so specific aircraft manuals and performance charts should always be consulted for accurate takeoff calculations.