Dick Hanson has it exactly right. Pattern could improve if the rules would allow the use of gas motors DH was able to build a sub 11 lb pattern plane with a 40cc gasser. If the rules allowed a slightly bigger wingspan and length, and raised or removed the weight limit, it would lower the cost and open up the options for plane design. A 40cc gasser costs less than the typical pattern motor, is much less expensive to operate, and develops more power. Just say no to glow!