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@Nephs
i've must have translated the title wrong, mechanical engineers migh be a more suitable title. however it wont help me out when im lying on the street with broken bones and spokes.
but as the brick said, some of the old drop outs had to be left on the "upper" tubes, and theres no couple force (it can at least be neglected) on that welding. The downer ones has about 1,5-2cm2 contact with pretty thick metal and are welded "around that", in lenght direction approx 15mm. kinda hard to explain.
this is the same drop out shown from both sides.
my biggest concern, however, is that it looks like shit with the two angles meeting. I should have just milled my own ones and made them bigger and "longer".
I wonder what Im trying to do here.. Am I trying to convince you all that it actually is going to work? -well that wont make them stronger, thats for sure..
thank you for all your opinions. Im keeping them all in mind when Im going out for my first test ride. and I'll wear a helmet, no brake thou, the frame is completely stripped. I should also say that this frame was a half decent mtb frame 10 years ago, and I was just about to throw it away or sell it for six pack of beer when I came up with this idea. the drop outs costed me about two packs of smokes, and here I am sitting inside on a friday wich means I already compensated economically for this project.
Im enthusiastic and gaining knowledge (and experience) everyday, it's great having you here to teach me!