The Alpha 400 is simular to the motor I am using. It is a direct fit. It has plenty of power for mild 3D on 3s. Here is the link to it,tho it shows out of stock now....

http://www.nitroplanes.com/al4003brmo.html

XHeli has the Alpha inn stock.......

http://www.xheli.com/18h-ee0080.html

28mm should fit,unless it's too tall. Here it the one I'm running now........

http://www.hobbycity.com/hobbycity/s...idProduct=5245

This the only place I see it in stock.

Hope this helps, Ron