Originally Posted by
ChristiaanJ
Never heard of it, so I did a quick read.
Seems it has "spoilerons", i.e. outboard spoilers used as ailerons.
I thought the alulae worked differently, but I'd better read up again on bird flight (and bird flight control) before spouting rubbish !
CJ
The spoilers are fairly small and located about 50% chord and about 2/3 span. They work rather well - good roll control without any adverse (or proverse) yaw - although because of the lack of any need for rudder in airborne flight the designers didn't put much rudder on it, making it fairly useless in crosswinds.
Superficially similar to alulae. Possibly.
G