4.09 - Support & Bug Reporting

[ImpalerNL]

Ive found a major bug.
Just kidding.

Fuel pressure problem for the bf109G10? (Dont know if this applies to the other bf109's too.)
If you look at the fuel pressure gauge, the pressure is almost at minimum, at full power (110%).
If the engine is running very lean at full power, it will destroy the engine in real live.

[ImpalerNL]

I have also tested it in a FW190A8, and in a BF109G6 and its the same bug.
I think all BF109s and all FW190s have this bug.

[Tempest123]

The mark on the airspeed indicator for 400Km/h on the yak-9M, and possibly other yaks too is in the wrong place, the needle passes the 400Km/h mark at 350km/h IAS. The airspeed indicator changes scale by 50% to larger increments at 300km/h, but the needle doesn't take this into effect until 400km/h, causing a 50 km/h difference in IAS. Hope I'm making sense here!

[nzwilliam]

Originally Posted by Tempest123

The mark on the airspeed indicator for 400Km/h on the yak-9M, and possibly other yaks too is in the wrong place, the needle passes the 400Km/h mark at 350km/h IAS. The airspeed indicator changes scale by 50% to larger increments at 300km/h, but the needle doesn't take this into effect until 400km/h, causing a 50 km/h difference in IAS. Hope I'm making sense here!

As far as I know IAS (Indicated Air Speed) and TAS (True Air Speed) really only ever overlap values at certain altitude due to air pressure. TAS is calculated based on IAS and air pressure...or something like that, maybe there's other variables.

The cockpit speedometer and speed displayed in the bottom left of the screen (if enabled) are IAS and if you go to no-cockpit view the speed in the HUD is in TAS. If this is the "bug" you're referring to...it's probably not such a bug as it is a feature from reality.

[dduff442]

A good approximation for TAS is to add 2% per 1000ft of altitude to your IAS.

dduff

[Blackdog_kt]

I'm not sure but my understanding is that Tempest is referring to the actual cockpit instruments and not discrepancies between cockpit (IAS) and no-cockpit (TAS) airspeed gauges.

Talking about cockpit gauges that display IAS, it's not rare to see airspeed indicators calibrated in a non-linear scale. So for example, there are tick marks every 20 degrees around the gauge's face for low speeds to provide more accurate readings/better scale resolution where it's possible to encounter a stall, but then the tick marks are placed every 10 degrees for the high speed range in order to save up on the amount of instrument space needed. If the same high resolution scale of 20 degrees per tick mark was used for the high speed range as well, we might need an airspeed gauge that functions in more than 360 degrees (like the ones found in the RAF aircraft for example). Shortening the distance between tick marks in the high speed range means that we can have instruments that display a bigger speed range without having to use a dual inner/outer speed read-out ring like the British indicators, just at the expense of reduced scale resolution at high speeds.

However, this means that the needle also has to move in a non linear way to ensure an accurate change over from one scale to the next.
If the needle's movement keeps linear when the scale of the gauge isn't, then the result is inaccurate readings at high speeds.

I could still be wrong, but that's the way i interpreted Tempest's post.

[Tempest123]

Yeah, thanks Blackdog, I am referring to a discrepency between IAS values on the instruments and on the speedbar, not the TAS shown in the wonder woman view. The airspeed indicator is accurate at all other speeds except between 350km/h and 400km/h where the tick mark is misdrawn. This is an easy bug to test, just go fly a yak-9m with the speedbar on and get her up to 350 km/h IAS on the speedbar, then look at the airspeed indicator, it will read 400 km/h IAS. It's just a misdrawn texture on the guage.