Nealius Posted December 2, 2021 Share Posted December 2, 2021 (edited) Just getting into the Su-27 and I'm noticing the slip indicator showing quite a bit of slip. Page 115 in the manual indicates the Su-27 has a roll-yaw crossfeed system, yaw stability system, and yaw damper in its FBW laws. In this case I would expect to not see any slip on the slip indicator. 2+2=3 at the moment. What's missing? Edited December 2, 2021 by Nealius Link to comment Share on other sites More sharing options...
Cmptohocah Posted December 3, 2021 Share Posted December 3, 2021 On 12/2/2021 at 3:25 AM, Nealius said: Just getting into the Su-27 and I'm noticing the slip indicator showing quite a bit of slip. Page 115 in the manual indicates the Su-27 has a roll-yaw crossfeed system, yaw stability system, and yaw damper in its FBW laws. In this case I would expect to not see any slip on the slip indicator. 2+2=3 at the moment. What's missing? I don't think the Flanker's modeled that well. But since I have never flown one IRL, I can't really make comparisons. One thing that strikes me is that it's completely unstable airplane which is supposed to be FBW. You trim it for a straight and level flight, let go of the controls and it will sooner, rather than latter, either start climbing or descending on its own. Not to mention that a trimmed airplane is supposed to always tend to return to it's trimmed state, which our Flanker definitely does not do. Cmptohocah=CMPTOHOCAH Link to comment Share on other sites More sharing options...
Kilo Posted December 3, 2021 Share Posted December 3, 2021 3 hours ago, Cmptohocah said: One thing that strikes me is that it's completely unstable airplane which is supposed to be FBW. You trim it for a straight and level flight, let go of the controls and it will sooner, rather than latter, either start climbing or descending on its own. Not to mention that a trimmed airplane is supposed to always tend to return to it's trimmed state, which our Flanker definitely does not do. That's Russian flight control philosophy. The ideea was that a Western-style FBW law would confuse a pilot as to what his speed is, so the nose up/down behaviour was artificially modelled to give the pilot a sense of his speed. I would guess this would be less of an issue for us if FFB joysticks were mainstream, so that we could feel what the plane was doing... Все буде добре Link to comment Share on other sites More sharing options...
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