Thanks for your input. I have built the model and used the data logger on the speed control to determine the current draw during the flight. For climb it used 11.6 A of power and cruise it used less than 9A. An airspeed sensor was also used and the numbers correlate quite well with the simulation we did over the summer before we built the first prototype. The goal is 100 miles distance. It needs to be fairly slow (30-35mph) because we have cameras on board that take pictures at 3 second intervals. For the proper image overlap 30-35mph is perfect. We are on to our second iteration of the airframe and things are progressing quite well. The airframe can support a gas engine as well as electric. My boss wants us to "quantify" that 100 miles distance is not cost effective when we are carrying two DSLR cameras and possibly a third thermal camera at the same time. He is afraid of gas engines and does not understand them. I will post images of the first prototype and the new fuselage as well. The wiki article (http://en.wikipedia.org/wiki/Range_(aircraft)) is definitely the direction I needed. Also, when comparing gas v. electric I need some direction on which one is actually more dangerous with regards to crashes/fires. The years that I have flown gas models I cannot recall one catching fire or seeing one catch fire after a crash. Thanks guys.