Been flying Pattern for one year now, got out of IMAC when a 50cc plane became a small plane and everybody wants bigger planes still. Could the problem with weight of pattern planes be handled is this manner. Instead of a max weight of 4.5kg make the rule a minimum weight of 4.5kg. This would let older or heaver planes to fly lower the cost for new bees. The flyers that are ultra competitive will still come in at 4.5kg.