This is my Delta Thing .... Its very cheap and simple to build. $13 and it flies great. I built this plane out of 1/2inch Polyshield foam from Lowes it cost about $10 bucks for a 4ft x 8ft sheet and $3 roll of black duck tape. Its very lite weight,flexable and strong.
My setup is...
Grayson micro jet V3 motor
7.4v 2s 20c 800mAh battery
2x T-Pro MG90S 9g Metal Gear Servos
Body 18" x 36"
Elev/Aile 3" x 11.5"
Vert.Stabilizer 13.5" x 6.5" x 4.5"
I fly this plane nose heavy and its very easy to control.
I set my expo to 70% elevator and 50% ailerons.