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Questions tagged [vertical-speed]

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

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0answers
49 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.
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1answer
111 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 ...
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2answers
101 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 ...
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135 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. ...
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3answers
328 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 ...
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2answers
409 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)?
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1answer
182 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
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1answer
106 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 ...
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1answer
580 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 ...
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1answer
150 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: $...
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2answers
219 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 ...
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2answers
7k 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....
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4answers
13k 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 ...
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2answers
3k 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 ...
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3answers
727 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 ...
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1answer
371 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, ...
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3answers
22k 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 ...
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2answers
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 ...
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1answer
1k views

How to decide on a rate of climb or descent if no specific vertical speed is required?

Obviously, obstacle clearance, charts, atc instructions etc. can require a specific rate of climb or descent, or at least pose limits that are easily calculated. When no such restrictions apply, there ...
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4answers
31k views

Flight Level Change or Vertical Speed - When to use it?

I've heard that some pilots have this difficulty to determine the correct use of both features. So, which is the difference between using the vertical speed, instead using the flight level change ...