I also work in alternative energy. My cofounder and I are physicists and the third principal is an electromechanical engineer. My cofounder has management expe

I also work in alternative energy. My cofounder and I are physicists and the third principal is an electromechanical engineer. My cofounder has management experience and technical/mathematical chops, and he's been a joy to work with. He has sort of taken a management role, ensuring that tasks are scheduled coherently, keeping the lines of communication open, and pinging sources for funds, parts, advice, etc. But we all have, to some extent. So it can work. However, bringing in outside managers, especially at an early stage, can be hugely problematic. My advice is to nominate the best of you to take on that role, and grow into in gradually. If you're over your head for a specific reason, then bring in a manager, and measure their success by that metric.