Hi guys, I am building an electromagnet to use mainly for its reaching properties. I want to have a large air gap. I don't care if the magnet can only lift a paper clip but I do care if it can move it from a 15 to 20 cm distance or more. I only have 1 core to work with so my choices are only with the winding technique I am not an engineer nor do I have any electrodynamics background and the basic questions I already figure out from googling it. This is what I cant figure out from the web, please help. 1.- Can I wind parallel wires in my magnet?, lets say 2, 3 or more at a time? you can see my attachment that shows a red, red/blue, red/blue/green configurations. My reasoning is that if I use 3 I can use 3x the amperage, save winding time and since the length of any individual wire is 1/3 of the traditional winding, it would have less resistance, more electric flow, better magetic field. Does this make sense, and if so, is it regularly done, any pointers in where to look some examples. 2.- Winding the first layer always looks beautiful!, second coming back not so much, third, ugly, from then on, a horrible mess, with huge gaps and air pockets. The reason is I am doing this by hand and my core is so damn heavy. But I also noticed the grooves between wires from the previous layer are oriented at cross angle from the direction of the current layer. This promotes skiping and bigger air pockets. But if I always wind in the same direction and have the wires just fall onto the groves from the previous layer at the same angle, (see the right side of my second attachment), the air between wires is also much smaller. The issue is that with every turn you end up in the same side and need to bridge to the other side to start the next turn. The figure shows layer 1 blue going from left to right, then bridges outside the coil to layer 2 green, then the layer 3 red. The second row of figures shows an exaggerated view of how layers lay onto each other with this and the usual technique and the third row shows a cross section of the wires and the difference in air pockets (in green). Also the wires are closer to the core with each turn in this method. I did this, I am not sure I see a difference, I will troubleshoot this but I wanted to ask smarter people than me to see if some theory will save me some of the time and money I spend doing this empirically.