[Danr55]

The point of that post was not to suggest that a lot of extra annealing was necessary but to caution against bending too small radii in hardened aluminum sheet. Nothing I can think of would be more disheartening than to see a brand new project with stress cracks through the paint on one or more bend radii. Like FWB, I've spent the last several years of my life working around flying things specifically rotorary wing things. Mostly things named after mean Indian tribes that spend a lot of time in the desert. Stress cracking in aluminum is a fact not fiction, but one that is easily avoided by taking a little extra caution in being careful with the size of the bend radius. That was the only point I was trying to make. Nothing else.