Hello All, I hope everyone has had a good weekend. I've put together an Excel sheet (168 Kb) into which I've programmed the various formulas involved in designing coils, such as would go into a generator or motor. It's setup so that the user can plug in a few variables and the sheet does the rest. I would like to have it tested, "given a run for it's money" and critiqued. If anyone is interested, please contact me by private message at GarageTinker@hotmail.com and I'll send it to you. Thanks.