RE: CA Models Eclipse build project Q&A
My Summit weighed in less than 11 pounds and flew like an arrow. I balanced it as recommended, and do not recall the need for excessive nose weight.
Now keep in mind, I was flying Futaba 9202 servos, a 6V 5 AA cell flight pack, and mechanical retracts. The equipment was also installed during assembly based on balance needs.
Hope this helps.