Cod - Andy is absolutely right. Money management and stops are absolutely key. In many ways far more important than picking the very best companies. I lost a pile of money in 2000 with virtually my entire portfolio stop-lossed out. I'm still at least five fold up if not ten fold up over the last five years - over the cycle. Sure PDX might not come good and I won't hesitate to exit if I feel the story has changed but theres lots of potential (and my current judgement is that it is not all in the price - although admittedly some of it is).
And yes the solar power idea is almost certainly not practical but it was an interesting thought and interesting to have it discussed. But the outboard motor thing is not why I or I believe most others are now invested in the company.