Weight of stores not balanced (rearm vs respawn difference)

[Lascaille]

Create a mission with a loaded Mig-21 (80% fuel and a symmetrical load of 500kg and 250kg bombs is a good demonstrator, but other payloads also work) and set it as 'takeoff from runway'. Takeoff, clean up, and note that there is a tendency for the aircraft to roll to the right; left stick is required to keep the aircraft straight and level. With SAU Recovery engaged the aircraft will stabilise in height with a right bank and will circle slowly to the right.

 

Drop the payload (note, even if you have dropped the payload through usage you have to JETTISON the payload using the buttons below the radar, specifically the outer pylons) and note that the roll tendency disappears.

 

You can now either land, or reload the mission. Either way when static on the runway, use the in-game payload editor (F8/Rearm) and load the Mig-21 with the same stores. Takeoff, clean up, and note that there NO roll behaviour and that engaging SAU recovery puts the aircraft dead straight and level.

 

In summary: The weight and balance of the stores is calculated differently when F8/Rearm is used than when the stores are on the aircraft from the outset of the mission. From the jettison behaviour - using the payload does not change the roll, only jettisoning it does - there is a 'phantom' store on the right outer pylon? This is also suggested by the fact you hear the jettison noise for the outer pylons when you hit the jettison button, even though there is nothing to jettison and nothing falls away.

Edited October 11, 2015 by Lascaille
Noted jettison behaviour

[Redglyph]

I see no reply, has this been addressed?

 

It certainly rolls and is almost uncontrolable when there is an asymmetric load (for ex. one or two fewer R-3 missiles on either side).

 

The effect doesn't seem to change when it's pre-loaded or re-loaded though. So it's probably correct in its current state (tested with DCS 2.0.4.59428.142).

Edited January 20, 2017 by Redglyph