Hi !
I know one the BIG-200 heli just come out from DNHPM.
With 32Kg weight (total load up to 50Kg).
Engine 5 cylinder (215cc) gasonile/oil mix (1-hour fuel tank), w/remote electric auto starter.
Main mast 20mm.
Tail shaft 10mm.
Main blade 1350mm.
Tail blade 200mm.
And...more...biger.
Click the link below for more info.
Main page
http://www.dnhpm.com/dnhp.htm .
Pictures page
http://www.dnhpm.com/BIG/BIG%20photo.htm .
Parts list & price
http://www.dnhpm.com/BIG/BIG-200%20Parts%List.htm .
Also the DNHPM have all beautiful 30-60-90 size helicopter.
Enjoy and have fun flying...