QNH

Quote from Aviator53

I would like to know, if it's necessary to change the QNH for every airport sice Aerofly doesn't have weather, but elevations are present?

The default QNH for each airport is 1013. No different value has yet been simulated.

QFE can be used where the barometric pressure knob is wound down to bring the Altitude display to read zero feet at an airfield above mean sea level. It means that you have to change it for every airfield you visit if you want the altimeter to read zero on the ground at that new airfield. If you are only three millibars (I don’t like hectopascals) out you could be reading a height of 600 feet on the approach’s turn onto finals but be 27 by 3 or 81 feet too low, quite hazardous.
Doing the maths flying between airfields is difficult, one’s brain power is committed to flying and there is little left for complicated new tasks. That is why there are autopilots or multiple crews.

QFE is commonly used at flying schools where most of the flying is done from the same airfield and having the altimeter reading zero on the ground is a big teaching advantage.
If you are remotely considering commercial flying at some point use QNH as early as possible, that is the standard used there. You set the local QNH sea level equivalent altimeter setting and land on the airfield’s true elevation, much more reliable and therefore safer.

In Aerofly to use QFE you would need to add the height difference in feet divided by about 27 (which changes day to day (in the real world) and with increasing height) to the altimeter barometric setting if visiting a lower altitude field and do the reverse for a higher airfield. In real life you would ask for the QFE over the radio which is not possible in Aerofly.

Flying a significant distance means entering an area with different atmospheric pressure so both QNH and QFE changes. This does not happen in the Aerofly world.

(Once you would start using QNH you would never want to go back).

IPACS’s local airport Stuttgart at 1177 feet, QFE 969 millibars/hectopascals.

Nearby but down near the Rhine Karlsruhe at 397 feet, QFE 998 millibars/hectopascals.

If you are gliding then it’s a good idea to set QFE since you always want to know how high you are above the ground.