Figured out a plan as to how to bend the conical curve on the F770 side skins. Looking in the back of the instruction manual I was able to get some clues on how the factory did it, albeit they are horrible black and white pictures. Using a scrap piece of AA6-125 and a long angle that came with the fuselage kit (not sure what it is for yet but it was not going to be damaged, just clamped to the table plus it had a nice radius). I matched drilled. The holes in the skin to the angle. I skipped the first hole in the skin because that is what I saw in the instruction pictures. You are suppose to use your thumb to gently bend this part, I was unsure how this would work to make a 90 degree bend. I also removed a piece of the angle flange on the top side because that is what the picture showed.
So to begin I enlarged the radius between the skin and the bend slightly to about 1/8-1/4 inch to relieve stress. Next I used what I believe was a good trick and possibly key to no cracks was to use a heat gun to warm the skin and area to soften it before the bend. I haven't seen anyone else do this but I like the idea. With everything tightly clamped and heated, I put the vice grips on to the angle and began slowly but consistently bending while using my thumb to provide bending to the front area. In less than a minute the bend was complete WITHOUT CRACKS. This was a wonderful outcome and I couldn't be happier to have it done without cracks, especially knowing that a ton of builders get cracks here. The skins were trial fit to the fuselage and they were darn near spot on with just minor massaging with my hands to complete the fit. I also placed an 1/8” dowel at the bend to see if that would help, I'm honestly not sure if it did anything, but why not.
Also, ream the holes for the bend and dimple them, this will make the fit much much better and easier.