On Thu, 30 Aug 2012 13:13:31 -0700, unclhank wrote:

The dumping of flaps seems to be well practiced in recovering from this
maneuver- I wonder who taught him this.

Its the recommended first action according to the ASW-20 POH, which goes
on to say that this action alone will often cause spin recovery, but that
if it doesn't, follow the standard procedure AFTER you've set the flaps
fully negative. The POH says the flap movement is to avoid exceeding VNE:
for positive flap settings VNE is quite low.

I'd also point out that sharply selecting fully negative flap reduces AOA
relative to the fuselage and airflow and so, as the POH says, may
initiate recovery by unstalling the wing.

Two points for those who haven't flown an ASW-20:

- ailerons and flaps are interconnected so that ailerons deflect with
the flaps as the flap lever is moved except when selecting landing
flap, when the ailerons go to a negative setting. This "crow mode"
increases drag and helps to prevent tip stalling.

- the POH recommends always starting an aerotow with the flaps in
position #2 (-6 degrees) for better low-speed control.


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martin@ | Martin Gregorie
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