THE CHENNAI-based Royal Enfield, the makers of the iconic Bullet, on Sunday announced that it will double its capacity to 1 lakh units per annum by the turn of 2012 to meet its rapidly growing demand. The company will be investing nearly Rs 80 crore to ramp up its capacity at its Chennai plant in a phased manner, Royal Enfield marketing and sales head Mr Shaji Koshy said, adding the company has already almost doubled its capacity from 28,000 units in 2007-08 to 52,000 units in 2009. The Siddharth Lal-promoted company will be jacking up its capacity to over 60,000 units this calendar year, while by 2012, the installed capacity will be 1 lakh units, Koshy said.