http://homebuiltaircraft.com/blogs/julio/default.aspxenCommunityServer 2007 SP2 (Debug Build: 20611.960)http://homebuiltaircraft.com/blogs/julio/archive/2009/02/10/want-to-design-and-build-a-small-home-built-aircraft.aspx#16139Tue, 23 Mar 2010 20:08:33 GMTc6246d00-37b3-4d4c-8ab1-aede5617ce78:16139glhood<p>For general purposes, shoot for between 20-30 kg/m2 for a lightly loaded airfoil. &nbsp;In your case, a 3m span with a 50cm chord would give you 1.5 square meter area. &nbsp;Including your airframe weight plus your 30kg payload, you could see better than a 30 kg/m2 wing loading. &nbsp;Depending on your airfoil selection you should see pretty docile handling and slow enough speed for crop dusting. &nbsp;Make sure your tail moments are adequate for the wingspan you use as this will affect handling as well. &nbsp;Tail volume should be calculated utilizing aerodynamic practices which can be found online.</p> <img src="http://homebuiltaircraft.com/aggbug.aspx?PostID=16139" width="1" height="1">http://homebuiltaircraft.com/blogs/julio/archive/2009/02/10/want-to-design-and-build-a-small-home-built-aircraft.aspx#16138Tue, 23 Mar 2010 20:08:25 GMTc6246d00-37b3-4d4c-8ab1-aede5617ce78:16138glhood<p>For general purposes, shoot for between 20-30 kg/m2 for a lightly loaded airfoil. &nbsp;In your case, a 3m span with a 50cm chord would give you 1.5 square meter area. &nbsp;Including your airframe weight plus your 30kg payload, you could see better than a 30 kg/m2 wing loading. &nbsp;Depending on your airfoil selection you should see pretty docile handling and slow enough speed for crop dusting. &nbsp;Make sure your tail moments are adequate for the wingspan you use as this will affect handling as well. &nbsp;Tail volume should be calculated utilizing aerodynamic practices which can be found online.</p> <img src="http://homebuiltaircraft.com/aggbug.aspx?PostID=16138" width="1" height="1">