On Saturday, December 12, 2015 at 8:19:57 AM UTC-5, Tango Eight wrote:

Anyhow: with powerful flaps in most any glider or power plane one has to coordinate flap, elevator & trim. Shouldn't have been a surprise.

Evan Ludeman / T8

I agree, my "pre flapped glider checkout" was done in a Cessna 150. We went up to altitude and played with flap settings while observing what the pitch attitude & AS did.
After that was some cockpit time (on the ground)in a SGS-1-35, then a flight. Followed quickly by a PIK-20 & a ASW-20. The 150 was good since it had more flap deflection than a 152 and was really draggy.
We didn't have any 2 seat flapped gliders on the field (late 70's) for dual training, but I did have ~200 hours in a 1-26 along with hours in a 1-34 and others.

It worked for me, no real surprises. The ASW-20 was a bit easier, I could set the flaps (usually thermal flaps) and then fly the dive brakes "like normal" in the pattern, unlike the other 2.