1. What is Wind Speed To Knock Over A Person?

Definition: This calculator estimates the wind speed required to knock over a standing person based on their weight, stance, and surface area.

Purpose: Helps understand wind force thresholds for safety planning in extreme weather conditions.

2. How Does the Calculator Work?

The calculator uses the wind force formula:

Where:

• \( F \) — Force needed to overcome stability (lbs)
• \( \rho \) — Air density (0.002377 slugs/ft³)
• \( v \) — Wind velocity (ft/s)
• \( C_d \) — Drag coefficient (1.15 for human body)
• \( A \) — Frontal area (ft²)

Explanation: The calculation determines when wind force exceeds a person's stability based on their weight and stance.

3. Importance of Wind Speed Thresholds

Details: Understanding these thresholds helps in weather safety planning, construction safety, and emergency preparedness.

4. Using the Calculator

Tips: Enter your weight in pounds, stance factor (1.0 for standing straight, higher for unstable positions), and your approximate frontal area.

5. Frequently Asked Questions (FAQ)

Q1: What's a typical threshold wind speed?
A: Most adults are knocked over at 70-90 mph winds, but this varies significantly based on factors.

Q2: How does stance affect stability?
A: Leaning into wind (stance ~0.8) increases stability, while standing straight (1.0) or unstable positions (1.2-2.0) decrease it.

Q3: What's average human surface area?
A: About 6-8 sq ft for adults, but varies by height and build.

Q4: Are there other factors not considered?
A: Yes, footwear, wind gusts, and body position significantly affect actual thresholds.

Q5: How accurate is this calculation?
A: It provides theoretical estimates - actual thresholds vary based on many physical factors.