The 10x4 APC on the LA 46 worked out just fine. I like a light load like that, as the needle is less critical. The student pilot did his first loops with no problems, getting in five in his first flight attempting them. Lap times varied a bit, but were about 5.3.
Dan: What is the "stick in the venturi" trick? I get the concept, but not the implementation
Ken: I've been hearing about "sealing the control surfaces" for forty some years, but have lost track as to how to do this. For example, on an existing model with Monokote, silkspan, etc.