4.101 RC - List of fixes

[Fenrir]

Originally Posted by PE_Tihi

And you seem very sure you know what you are talking about? I studied aerodynamics, you know. Did you, or did the guy who threw me a bone, as you say?

Well then you surely must understand the principles of gyroscopic precession; the reason why when you push or pull the nose up or down in pitch you get a reaction in the yawing plane. The reverse is true too, you know, which is why:

Originally Posted by PE_Tihi

If the rudder or some other control is moved energetically to push the nose down in a stall climb, this causes slow ( ~ 0,7 Hz) and very strong pitch oscillations, (amplitude like 45 deg or more relative to the flightpath direction). They do not get damped to sufferable level before plane reaches something like 200 kmh in the dive. No other plane in the game behaves nearly so wild.

Ah, so now you talking about longitudinal stability, which has nothing to do with elevators; for what it's worth the later Spit marks were always somewhat behind the curve when dealing in vertical tail surface area with each progressive increase in power - so at low speed you don't have enough airflow going over the fin/rudder to provide adequate compensation for your power setting - no surprise, and until we get a pilot in here who can authoritatively comment on the planes behavioural characteristics under such flight conditions, we are gonna have to trust TDs judgement.

Originally Posted by PE_Tihi

As for the reasons why your Spit pitches up the nose wildly, almost certainly the reason is TD moving the CG backwards. CG position is the MAIN pitch stability factor. That s why the above happens. And I wrote that already here, a page or so back. Take a look at the picture there.

There are many reasons not just CofG for trim change, and if you'd studied aerodynamics as thoroughly as you claim, you'd know this. Trim change can be accomplished through airframe/fixed surface/moving surface design and even by the manner of mass balance - to accuse TD of moving the CofG position, well, you assume too much. Especially as the spits do not exhibit any of the other criteria to warrant an accusation of pitch instability.

Originally Posted by PE_Tihi

The effects are most obvious in slow flight, near stall; and still strong enough at combat speeds to spoil the aim. And the plane is instable laterally, too.

Wow, a 1600hp aircraft at slow speed tricky to handle? With little air moving over flight surfaces and a massive torque reaction?

Originally Posted by PE_Tihi

If you cannot see anything of the above in flight, I cannot help you further.

I see a little more longitudinal reaction to aileron input, but not catastrophic, I see a low elevator trim speed with no pitch instability, and bugger all instability laterally unless i'm flying with the rudder badly trimmed. Personally, I think you have controller issues, or you need practice to get the best out of the spit.

Originally Posted by PE_Tihi

What they sold you as a reason for the planes bad pitch trim, I do not know. After seeing their FM work here, I do not care, either.

They showed us all a pic of a modern day restored Spitfire flying in formation with a photo a/c at low airspeed with significant down elevator deflection.

Tihi, I suggest if you want people to listen to your issues then you provide quantifiable data or a series of pilot reports - and much more than one - that backup your arguments or that at least point to a common extrapolated outcome.

Currently you come here with nothing more than opinions delivered with a exasperating sense of melodrama and an irritatingly belittling attitude towards the guys at Team Diadalos - you win no friends and thusly make any chance that your grievances might be even investigated, let alone fixed, marginal at best.