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Old 05-18-2017, 08:46 PM
Tolwyn Tolwyn is offline
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Posts: 194
Default FMB / Mission Speed Bug

Ok. My one question to IC/TD is this.

What is up with Speed in the FMB?

Can anyone give a CLEAR. CONCISE. ANSWER, please?

Here's my original post on this matter, and then a followup link to a forum post by someone with the same concern.

Is the Speed in the FMB IAS or TAS? Is this correct when flown by Human or AI?

I can't imagine how old this bug is.
PLEASE PLEASE take a close look at this. I normally wouldn't plead, but this is... important.

This centers around whether the flight is flown by AI or Human (in either SP or COOP mode).

Let's look at a typical line of waypoint information in a Mission file:

NORMFLY 7500.00 10000.00 6000.00 428.00 &1

The first value is the East/West coordinate. (in meters)

The second value is the North/South coordinate. (in meters)

The third value is the altitude (ALWAYS in meters). (in meters)

which leads us to

the fourth value is SPEED (ALWAYS in kph)

However, if it's a HUMAN controlled plane, this value is:

The TRUE AIR SPEED (TAS) given the Altitude... the speed your plane is at when you spawn in is IAS.

if you fly Imperial: 482 = about 190mph IAS @ around 20,000feet (6000m)
if you fly Metric: 482 = about 306kph IAS @ 6,000m
With me so far?

If you are the HUMAN in this flight, you spawn in the game travelling at 190mph or 306kph.

If the flight is an AI flight (or if the pilot is AI), the aircraft spawns in attempting to fly at the LITERAL value in the mission file (266mph (482kph)!!)

Can we fix this please? For mission planning and timing, etc.?

The game doesn't translate speed for AI flights the same as it does for Human flights based upon the values in the MISSION file.

Last edited by Tolwyn; 05-19-2017 at 05:55 PM.
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Old 05-19-2017, 05:50 PM
Tolwyn Tolwyn is offline
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Join Date: Apr 2010
Posts: 194

Here is a great post that also is also discussing the question:

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Old 05-20-2017, 02:44 PM
Marabekm Marabekm is offline
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As far as I know, yes speed is in kilometers per hour.

The AI will always fly at the speed you have them set to in the waypoint. So if you set it to 100 kph or 500 kph the AI will fly at that speed.

The players aircraft, the mission builder has 0 control over what speed they fly to be honest. Because the AI will fly at the set speed but maybe I want to fly max throttle, or I want to fly 60 throttle or whatever. But you would have no control over how fast I wanted to go.
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Old Yesterday, 07:40 PM
Tolwyn Tolwyn is offline
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No you missed what I said I'm wondering if it's in true AirSpeed or indicated AirSpeed because I'm getting different results each time I try it. I know that it's in metric km/h but the question I have is whether or not it is consistently true AirSpeed to the ground or indicated AirSpeed by altitude.
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Old Yesterday, 09:16 PM
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dimlee dimlee is offline
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Just as a side note.
I tested Bf 110D recently in long flights over the sea and discovered something I never noticed before. When IAS remains constant, let's say exactly 380 kmh, TAS fluctuates a lot, for example, from 413 kmh to 419 kmh. No changes in altitude. Both readings are from screen indications.
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