Fuel Economy, Hypermiling, EcoModding News and Forum - EcoModder.com - View Single Post

aerohead · 02-14-2014, 05:03 PM

I expanded and modified a graphic for canopy drag published in Goro Tamai's "THE LEADING EDGE".
What's unique about the data concerns 'reversed' bodies.Since 1974 I've seen less than a handful of images depicting drag measurements of 'reversed' teardrops.They're dramatic in that the significance of losing the boat tail really shows up no matter how slick the nose is.
All seven images,when viewed from above (plan view)are teardrops,with aft-body plan-taper to a point.
All Cds are approximations,as they vary as a function of where they're positioned on a body,and the quality of the boundary layer at any given location.The numbers were generated in MIT's wind tunnel.

Here is a drag table for aircraft canopies from Hoener's book,'AERODYNAMIC DRAG',

Here are some armaments enclosures:

02-14-2014, 05:03 PM	#1 (permalink)
aerohead Master EcoModder Join Date: Jan 2008 Location: Sanger,Texas,U.S.A. Posts: 15,895 Thanks: 23,972 Thanked 7,223 Times in 4,650 Posts	Canopy drag I expanded and modified a graphic for canopy drag published in Goro Tamai's "THE LEADING EDGE". What's unique about the data concerns 'reversed' bodies.Since 1974 I've seen less than a handful of images depicting drag measurements of 'reversed' teardrops.They're dramatic in that the significance of losing the boat tail really shows up no matter how slick the nose is. All seven images,when viewed from above (plan view)are teardrops,with aft-body plan-taper to a point. All Cds are approximations,as they vary as a function of where they're positioned on a body,and the quality of the boundary layer at any given location.The numbers were generated in MIT's wind tunnel. Here is a drag table for aircraft canopies from Hoener's book,'AERODYNAMIC DRAG', Here are some armaments enclosures: __________________ Photobucket album: http://s1271.photobucket.com/albums/jj622/aerohead2/ Last edited by aerohead; 02-19-2014 at 06:05 PM.. Reason: add 2nd Hoerner table