Spit IIA Speed in game test

[ATAG_Snapper]

Maybe that's it, Klem.

Except, the Ia's FM's agree very closely under the exact same test conditions offline vs online. The IIa's FM's do not.

[5./JG27.Farber]

Me and my wingman often have 200m's defference staring from the same field on our altimeters.

[klem]

Originally Posted by 5./JG27.Farber

Me and my wingman often have 200m's defference staring from the same field on our altimeters.

??!!

Both have same baro setting?
Reading from the tooltip or the gauge needle?
Tooltips are to nearest 100 feet in RAF planes so one a/c at 90 feet and one at 105 feet will read 0 and 100 respectively.

Or the 109s are porked and next time I will run from a 109 at 25 feet and see what happens behind me

[5./JG27.Farber]

We both take off and he'll say 2000m's and Ill say what? we are are at 2200. Read from the needle.

[IvanK]

Easiest way to set accurate QNH is set the Altimeter to the field elevation. Field elevation can be found in FMB. Attached file has every airfield's elevation in the Sim all obtained from FMB.

A 1mb error should only result in 30ft/10m error.

I do believe the default maps have some diurnal variation in both Temperature and pressure. I too have seen 992mb as the setting on ATAG at some times and 995mb at other times.

[klem]

Originally Posted by 5./JG27.Farber

We both take off and he'll say 2000m's and Ill say what? we are are at 2200. Read from the needle.

Specsavers?

Seriously, that's weird. Even if he had set field elevation, typically 995mb, thats only about 150 feet/50m difference from the default 1000mb. 992 would be about 240ft/80m.

[Crumpp]

Seriously, that's weird.

YES and pretty much invalidates the ability to test any kind of performance without a stable atmospheric model.

[Crumpp]

Even if he had set field elevation, typically 995mb, thats only about 150 feet/50m difference from the default 1000mb. 992 would be about 240ft/80m.

It should be easy to confirm the atmospheric model.

1. Go to a known airport like London Biggen Hill. The field elevation at EGKB is 599 ft.

2. Set your altimeter to field elevation (599 ft) and your altimeter setting should read 992mb when converted. If it does not read the setting and record the temperature.

[5./JG27.Farber]

Originally Posted by klem

Specsavers?

Seriously, that's weird. Even if he had set field elevation, typically 995mb, thats only about 150 feet/50m difference from the default 1000mb. 992 would be about 240ft/80m.

Im talking about the 109. Maybe its different.

[Crumpp]

Biggin alt may vary according to spawn point.

Of course, I got my elevation from an aeronautical information site.

Look under METAR and be advised it changes with conditions. It will vary from 597-600 depending on which site you check.

Here it is 600 today:

http://www.checkwx.com/wxmain/fullsite/EGKB