Challenge:

To accomplish the task, the model had to be very light and yet large enough to support a suitable motor, radio receiver and servos, and the solar panels required for flight

Target:

We set out to build a model comparable to existing battery powered models.  According to our consultant (www.skyhooks.ca) the target weight for these is typically 0.4g/in² of wing area and their target propeller-thrust-to-model-weight ratio is ¼ or more.