# Questions tagged [vertical-speed]

The rate of altitude change, measured in positive and negative feet per minute.

20 questions
Filter by
Sorted by
Tagged with
65 views

### What is the maximum permissible error of Vertical Speed Indicator for General Aviation flight operations according to FAA?

I know that if VSI shows +100 during preflight cockpit check that can be considered as 0 and flight can be conducted based on that but what is the max error permissible for VSI usage.
211 views

### What is the vertical speed limit when altitude mode is engaged?

This question applies to Airbus' autopilot but may not be restricted to just this manufacturer (there must be equivalent modes on ATR, Embraer, Dassault Falcons, etc.) For the vertical plan, the ...
118 views

### Trying to find the vertical acceleration by subtracting weight from lift

I'm trying to determine the vertical acceleration component of a plane with the following specifications: Density of air: 1.29kg/m3 Speed: 33 m/s Wing area: 13.97 m2 Lift Coefficient: 1.5 Mass:560 kg ...
181 views

### What’s the speed for lowest sink rate on a DA20?

In the DA20, the POH lists for glide speed (flaps up) only one speed giving the best glide angle / furthest distance (73 KIAS). But what about, if I don’t need that much distance to glide (e.g. ...
434 views

### Is it possible to see the same sunset twice from an aircraft? [closed]

If I initiate a climb just after watching the sun go down below the horizon, how fast would I have to climb in order to watch the sun come back up, so that I could then level off and watch the sunset ...
438 views

### What are the consequences of touching down at too low of a speed?

The consequences of a high speed touchdown / high vertical speed are very much obvious. However, what will the consequences be of a low speed touchdown? How severe are they (if any)?
225 views

### What is Temperture of VSI and limits of accurate value?

Within a temperature range of +50C and -20C the VSI is Accurate to within limits of : A)+- 200 ft/min B)+- 0 ft/min c)+- 75 ft/min D)+- 300 ft/min
135 views

### Is there a way to calculate the difference in pitch required to reach a certain vertical speed? [closed]

I am programming an autopilot for a 787 flight sim software and I've been having a problem. I'm trying to simulate a PID that controls the pitch of the aircraft In relation to the vertical speed ...
661 views

### Is Vertical Speed based on True Airspeed or Groundspeed?

I have edited this for clarity For the same angle of descent or climb, does vertical speed increase if true airspeed is greater or if ground speed is greater (due to a tailwind)? Imagine a triangle ...
152 views

### What is the name of centre of mass speed of an aircraft?

I have a list of positions (X [NM], Y[NM], Z[NM]) of an aircraft. Every coordinate is given every 1 second. I calculate the speed [knots] between two consecutive coordinates in the following way: \$...
230 views

### Is this scheme for a single-fan electric airship with a rocket-like geometry workable?

I am currently designing a vertical take-off and landing vehicle that uses a Tesla powertrain connected to an electric ducted fan. Please comment on if my thought process is sound on my feasibility ...
8k views

### Is there a formula to calculate ground distance traveled given rate of climb and true airspeed?

I'm looking for a formula to calculate the horizontal distance (guess it is the Ground Distance) passed during the phase of ascent (or descent), having the rate of climb in ft/min and the TAS in knots....
15k views

### What is the descent rate in emergency situations?

I fly a plane at 40000 feet. There is a sudden depressurization; what is the maximum vertical speed I can keep to come back at a proper altitude? Is this speed different for different emergency ...
4k views

### How does a nose down stall occur?

Imagine I am in a straight down dive, at terrific speed, and if I wanted upward sharp turn and got the stick back far enough, would I stall (or spin)? Does normal laws apply when the aircraft nose is ...
874 views

### Why don't Transport Category aircraft have a listed Vy?

I was talking with a pilot about an inability to maintain the targeted climb rate in a particular situation and asked him what the Vy was for the jet. He curtly replied "Vy is only for Part 23 ...
384 views

### Do steam-gauge VSIs compensate for altitude?

A Vertical Speed Indicator indicates rate of altitude change. Traditional VSIs use a calibrated leak to measure the rate of pressure change, and therefore the rate of altitude change. However, ...
24k views

### What climb rates can the Airbus A320-200 achieve and which climb rates are commonly used for normal flight operations?

In relation to AirAsia flight QZ8501 officials have been quoted as saying: "It is not normal to climb like that. It's very rare for commercial planes, which normally climb just 1,000 to 2,000 feet ...
6k views

### How does an energy variometer work?

In a comment to an answer regarding instrumentation complexity, an "energy variometer" was mentioned, labeled in knots. What does this dial actually show, and how does it work? The image accompanying ...