At ORD once, ATC, I mentioned that the traffic was about to over run my ability at that moment. I was told this wise counseling, “if you get behind, work faster!” Actually, yep. (But I’m counting on Bot Gpt to soon monitor all my actions). In fact I just now asked Bot how fast do I need to descend from 11 miles out at 7000’. Then I added at 150kts. In ten seconds I had this. I’m tossing my E6B.
If you are flying at a speed of 150 knots during the approach, it will affect the rate of descent required to maintain the glide slope angle.
The rate of descent required to maintain a 3-degree glide slope is calculated using the following formula:
Descent Rate = (Distance to runway x Tan(Glide Slope Angle)) + (Altitude Above Field / 3)
Assuming the same values as before (11 miles from the runway and 7,000 feet altitude), we get:
Descent Rate = (11 x Tan(3)) + (7000 / 3)
Descent Rate = (11 x 0.0524) + 2333.33
Descent Rate = 2333.85 feet per minute (rounded to the nearest hundredth)
However, at a speed of 150 knots, your ground speed will be higher, which means you will cover the same distance to the runway in less time. This means that you will need to increase your descent rate to maintain the 3-degree glide slope. The exact increase in descent rate will depend on your ground speed, but as a rough estimate, you could increase the descent rate by around 5-10% per 10 knots of airspeed increase.
So, at 150 knots airspeed, you might need to descend at a rate of around 2500 feet per minute to maintain the 3-degree glide slope. However, it’s important to follow your aircraft’s published approach and landing procedures and to adjust your descent rate as necessary based on airspeed and other factors.
Crazy stuff.