Changing Speed of AI aircraft results in odd behaviour

[TEMPEST.114]

I'm trying to change the speed by 20kts

Here's the maths of what's happening in the script

2023-02-09 16:54:31.579 INFO    (Main): magnitdue 208.744693
2023-02-09 16:54:31.579 INFO    (Main): knots 405.767222
2023-02-09 16:54:31.579 INFO    (Main): newSpeed 425.767222     deltaSpeed  20.000000
2023-02-09 16:54:31.579 INFO    (Main): newSpeedInMPS 219.033582
 

(magnitude is the MPS of the aircraft before any changes) i.e. getVelocity()

I convert to knots, make the delta change and reconvert back to MPS before I issue the setSpeed command.

These numbers were used on an F18 at 18000ft at 350kts. After the change, it's speed went to 425kts.

What the hell is going on? Is this a bug?

Here's the code:

local velocityInMPS = selectedAircraft.unit:getVelocity()
local magnitude     = GetVectorMagnitude(velocityInMPS)
local knots         = MpsToKnots(magnitude)
local newSpeed      = knots + deltaSpeed
local newSpeedInMPS = KnotsToMPS(newSpeed)

selectedAircraft.group:getController():setSpeed(newSpeedInMPS, true)

 

 

 

[TEMPEST.114]

This is frustrating...

 

  local velocityInMPS    = GetVectorMagnitude(magnitude)
  local knots            = MpsToKnots(velocityInMPS)

where

function MpsToKnots(mps)

  return mps * 1.94384449

end

function GetVectorMagnitude(vec)

  return (vec.x^2 + vec.y^2 + vec.z^2)^0.5

end

For this:

Google says:

 

But the function returns

 

363kts

 

What's going on?!