Someone here (jgf???) suggested to get another F14 after all the problems with the IRIS one. In looking for one, I found an update to the IRIS aircraft.cfg file which has improved things a LOT. So I now have an F-14 I can land, yay! But the autothrottle still doesn't work properly. At moderately high speeds (200 - 300kn) it takes a long long time to get to the commanded speed.
Now I can live with that, but I mention it in case it is relevant to the main problem, which I can't live with. Below about 200kn, and getting worse the slower it flies, the autothrottle causes tremendous but slow engine oscillations. Of the order of 15 knots, which at carrier landing speeds is disastrous. I set say 112 knots, I get (seemingly) sinusoidal variations between 115 and 130 knots. Makes it very difficult to hit the arrestor wires.
Thinking it might be a low-RPM problem, I try the landing with the airbrake/spoiler deployed. N1 is now obviously a lot higher, but the oscillations are still there, albeit slightly not quite as bad.
Many of the other fast carrier jets, both from similar and different stables, have similar problems. Some have it it worse, some not as bad. A handful do not have this problem at all, right down to and below full-flaps stalling speed. I tested many and found huge variations.
This is definitely an AT problem. With the AT off, N1 varies with F1-F4 keys, as it should, but it reaches a particular value and stays there.
Where to from here? Comparing the many aircraft.cfg parameters that are different between the both good and bad planes gives such great variations that it's way beyond my analytical skills to figure out what to change and in what direction.
Can anyone make some concrete suggestions as to what to look at? Is it worth looking at any particular aircraft.cfg parameters, either prima face on their own, or comparing them from the good vs bad example? Or should I reluctantly and after all this water under the bridge abandon this plane after all?
Steve from Mudgee.