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TOPIC: Airplane/Flight Test Terms

Airplane/Flight Test Terms 3 weeks 5 days ago #943

  • hunterbloch
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I was reading the #TBT from Feb 1999 (page 10) and came across the term "rollervator", under the Discussion of "Input & Deflection" Conventions section.

what is a rollervator? I am familiar with Elevators, stabilators and ruddervators, but I have not heard of a rollervator before. Could someone explain this to me? If you have any good pictures or description documents it would be great to get some more understanding.

FTN Feb 1999
- Hunter Bloch

Airplane/Flight Test Terms 3 weeks 5 days ago #944

  • alawless
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rollervators ain't nuthin' but differential horizontal tail deflection. Planes like the F-16 can fade in the differential to provide more roll authority at high AOA

Airplane/Flight Test Terms 3 weeks 2 days ago #945

  • hunterbloch
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Sorry but I don't understand what you mean by "fade in the differential" (newer to flight testing). Do you mean that a rollervater is not a piece of hardware, but is actually more of a system logic? I was looking at the F-16 picture (attached) and see what I understand to be a stabilator (red square). I also see what looks like a single piece rotatable rudder (blue square), but from your description of high AOA roll authority I wasn't sure if maybe this would be the rollervater?
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- Hunter Bloch
Last Edit: by hunterbloch. Reason: spelling edit

Airplane/Flight Test Terms 3 weeks 2 days ago #947

  • alawless
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If the flight controls on the F-16 are designed to move the stabilators deferentially, then some people would call that a rollervator function. Instead of calling them stabilators, some might use the term rollervators . The terminology is not regulated.

If I recall correctly, the F-16 stabilators provide primary roll authority at high AOA: they blend in as aileron movement fades out with increasing AOA.
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