Neuro I'm also not convinced, just curious so it's the line that I'm pursuing. Also I was rolling my eyes at myself, not sure what all these smileys signify []. Agreed as to the many factors affecting slow flight, none of which I know much about at this point. Also agreed as to motors harmonizing.

I measured the extruded polystyrene foam from Slingwing, which their website advertises to be 3.5mm ( http://www.slingwing.com/retail_stor...tml#foamsheets ). I don't have calipers or a even a mm graduated rule! Jonny's an American. But the foam that I got, measures to 1/8" which is 3.175 mm. I used this to calculate the total surface area to the wind of the tri-platter design, without electronics or tail. I get 5.7109375 square inches, equivalent to a square 2.38975678"** on a side. That is the absolute minimum amount of air that I have to push against or slip through, while this thing is in flight. 7 layers of aluminum can material stacked, measure out to about 1/16". Obviously, aluminum can material doesn't have the rigidity and weight of extruded polystyrene but it is an interesting comparison. I'll have some aluminum can material with me to weigh as well as the eps, when I go to Thayer school on Monday.

I can't seem to find the lists of weights on the aatoolbox site, is aluminum can material weight listed anyone? -john

**edited this figure for accuracy.