I have finished my new "Impact"....
This one is as much smaller than a standard Impact then the previous electric versions were larger. This one is 650 in^2. AR=5.25, and the wing thickness was also reduced. This is a significant change from all previous Impacts. The span is now 58.5". The weight is SIGNIFICANTLY improved at 61.8 ounces, ready for flight. Not bad for containing a 14 ounce battery!
The first flights were interesting. I took the system directly out of my test Impact, motor, timer, prop, ESC, etc. I left the settings the same. It flew at 5.3 sec / lap in the "normal" size impact. In the new plane, it went about 4.6 sec / lap. A very significant decrease in drag! Once slowed down to 5.2 sec / lap, it was very nice. I especially notice the better corner than the other electrics. So far, only 5 flights. The weather has been abysmal since, and I haven't flown it since. I am eager to work with it to make it a real winner. I plan on using it at the '11 Nats, so I have a few months to get it working right!