50-60cm? That's a little small for a 3D'r but ok. I think [link=http://www.unitedhobbies.com/UNITEDHOBBIES/store/uh_viewItem.asp?idProduct=9203&Product_Name=Piaget _Micro_3D_plane_EPP_Kit_w/_Motor_&_ESC]this[/link] Might suit your needs. [link=http://www.hobby-lobby.com/yak_55_aerobatic_3d_profile_airplane_red_black_air plane_7001_prd1.htm]I have heard lots of great things about this plane too.[/link] If you don't like those, a suitcase plane might be a good idea considering you want it in a flat pack. Any 400 size outrunner and 25 amp speed control with 1200-1900 mAh li po batteries should do fine. A great charger to get is the Triton. I love mine and it is well worth the money!