Simviation Forums

I don't know what's going on but I was flying (virtual of course) two models of AB 340-300 Posky and a GMax B-52, separately of course. At 37,000 feet and speed at 500MPH, the aircraft started to nose up and when I tried to push the nose down, the aircraft went into  gyration and tailspinned out of control. All other aspects seemed normal from take off to around 32,000 feet when I noticed the planes started to nose up. Is there any phenomenon I am not aware off when flying at high altitudes and speed?

Bubblehead

Been a while since I've flown anything that big or that high. My guess is to great a climb rate.

If the ap is set for a climb rate greater than can be maintained at that altitude, its going to pitch up trying to match the set climb rate. Eventually, even at 500mph, you'll pass the critical angle of attack and your gonna stall.

The other possibility could be instrument failure, iced pitot. The ap thinks it's falling, and the same scenerio occurs.

Dave

"At 37,000 feet and speed at 500MPH,"

I'm getting a flashback to my early flighttraining days when we learned the three (3) cardinal rules of flight:

1.) Maintain your airspeed
2.) Maintain your airspeed
3.) Maintain your airspeed

May I suggest monitoring your airspeed -- KIAS -- instead of your GS.

Reference cited: Pilot's Web

"AIRSPEED- The speed of an aircraft relative to its surrounding air mass. The unqualified term "airspeed" means one of the following: a. Indicated Airspeed- The speed shown on the aircraft airspeed indicator. This is the speed used in pilot/controller communications under the general term "airspeed."

Errata:
KIAS: The indicated airspeed displayed on the aircraft's airspeed indicator (KIAS)
GS: Ground Speed

It could just be a programming error or air file corruption, which causes them to do that.  It has happened in several of my addon planes before, which probably weren't tested enough.

Bad FM's