I wonder which super pilot decided that these were good rules? Line length and weight are not mutually dependent. I'm sure anyone that has flown Stunt can tell you how a model is trimmed with line length and an eight pounder can fly very well on lines shorter than 65 feet. I guess 1/2A is out as most won't fly well on 52' 6" footers.
It may be that the rule writers are trying to hasten the event's demise by additional restrictions. This reducing any hope of someone with a casual entry level model being legal. This will keep the entry number nice and low.

Below are pictures of models that are illegal (P-38, line length 47 feet) or severely handicapped (by Tigercat not having throttle control) and people will not be seeing at any Scale events.

Good job AMA and NASA!

Chris...