FeuerFliegen Posted February 5 Posted February 5 So I have been doing some testing, and it seems like I am not able to achieve anywhere near the speeds that are stated in the specifications. The specifications state that with GM-1, the plane can do 756kph at 12km altitude. I am able to get nowhere near that. Using the standard formula of adding 6% per 1km of altitude to go from IAS to TAS, I assume that 756kph TAS would be equal to 439.5kph IAS. The absolute max I've ever been able to achieve on Kuban Autumn map, even with fuel locked to only 100L, was 379kph. That equals about 652kph true air speed. That's a massive difference. Am I doing something wrong? or is this place much slower than it should be? Quote
MaxPower Posted February 8 Posted February 8 (edited) I think the calculation from ias to tas might be wrong. Using the airspeed conversions from aerotoolbox, I get 756km/h @ 12000m is equal to 400 km/h Calibrated Airspeed, and 380 km/h Equivalent Airspeed. Calibrated Airspeed is Indicated Airspeed corrected for errors in the airspeed measuring apparatus. Different aircraft would have different corrections. But, I don't think il2 models airspeed meter inaccuracies, at least not in the HUD, so this should be the correct airspeed. Equivalent Airspeed is Calibrated Airspeed that has been corrected for compressibility effects at high speed and altitude. I'm not sure if il2 models this, but your number 379 IAS and 380 CAS are suspiciously close! So, whether the FM is accurate would depend heavily on whether compressibility and mach effects are modelled in the sim. And, also whether the airspeed meters in the HUD is IAS, CAS or EAS if that's the meter you're using. Also a nice bit of trivia from the airspeed conversions website. 756 km/h at 12000 meters is mach 0.71... which is just amazing. Edited February 8 by MaxPower Quote
MaxPower Posted February 8 Posted February 8 I just wanted to follow up on the EAS thing. There are a few devblogs over the years that talk about research in modelling compressibility effects. So, compressibility may indeed influence the IAS airspeed meter. https://il2sturmovik.com/news/417/dev-blog-202/ Quote
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