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Dave
you should be improving the airplane that you are testing not just writing scary stories. Aerobatics are fun but good handling qualities are built in or added in flight test. I have evaluated many vortex generator kits and discovered that if you have a problem that cannot be improved by another means consider vortex generators but keep in mind that if you put rivets, probes, or any thing that protrudes on an airplane, if goes slower. Most of the heavily advertised 'lower stall speed kits' take at least 5 knots off the cruise speed.
Changing the angle of incident or flow strips will improve low speed handling and stalls with little or no impact on the cruise speed.
In answer to your question, a rolloff is an uncontrollable roll against full opposite aileron and rudder. If a rolloff starts it is time to recover to avoid departures or spin entries.
With reference to pitchups these have occurred at CG's other that full aft, but they are far more common at the aft limit of the CG range. these are not necessarily only uncommanded in the sense of an abrupt rapid pitch up but gradual loss of ability to pitch the nose down to the point that the nose is slowly pitching up and full down elevator will not arrest it. We did deep stall tests and achieved angle of attacks up to 65 degrees. These were power on stalls and interestingly this caused rates of sink up to 3500 feet per minute with full power at gross weight and aft CG..
Jack Webb
Jack Webb
L 360, L IV
ATP, CFI Airplanes & Instruments, Multi Sea
Many Type Ratings
Experienced Experimental Test Pilot both multi and
single engine
Former Chief Engineering Test Pilot for a Major
Manufacturer
AeroSpace Engineer BSAE
Ohio
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