Fuel Economy, Hypermiling, EcoModding News and Forum - EcoModder.com - View Single Post - Different ways to measure/calculate frontal area (A)

NeilBlanchard · 02-18-2009, 08:42 PM

Hi,

I would use DataCAD to trace a polyline on the telephoto picture, and then measure the area with the handy Measures menu...report it in square meters or square feet; no problem. Here's two examples using the Aptera; the one on the left is a perspective distorted rendering, the one on the right is a pretty long shot of an actual vehicle:

Using the area from the long photo, the Aptera 2e has a CdA of 0.277 meters. (The hatch grid is 12" squares, btw.)

02-18-2009, 08:42 PM	#19 (permalink)
NeilBlanchard Master EcoModder Join Date: May 2008 Location: Maynard, MA Eaarth Posts: 7,908 Mica Blue - '05 Scion xA RS 2.0 Team Toyota 90 day: 42.48 mpg (US) Forest - '15 Nissan Leaf S Team Nissan 90 day: 156.46 mpg (US) Number 7 - '15 VW e-Golf SEL TEAM VW AUDI Group 90 day: 155.81 mpg (US) Thanks: 3,475 Thanked 2,952 Times in 1,845 Posts	Hi, I would use DataCAD to trace a polyline on the telephoto picture, and then measure the area with the handy Measures menu...report it in square meters or square feet; no problem. Here's two examples using the Aptera; the one on the left is a perspective distorted rendering, the one on the right is a pretty long shot of an actual vehicle: Using the area from the long photo, the Aptera 2e has a CdA of 0.277 meters. (The hatch grid is 12" squares, btw.) __________________ Sincerely, Neil http://neilblanchard.blogspot.com/