ok so my idea for stopping the oil leak was not accepted for complexity reasons but i have another bunch of concepts in other fields that i would like to put on the barbecue my question is in relation to the drawings i would like post i work with autocad - .dwg sort of files are these the best ones to post or is some other format more ubiquitous please advise i want to start talking about shrouded vertical axis wind turbines that concentrate the wind on the rotor thanks