Versions 1 and 2 had their problems. A little twitchy, small battery compartment and the booms were fragile. In V3 I have: Increased the size overall to 110% of the original Put in a larger battery space Increased the boom size and V stabs Added an extra layer of fb to the spar for a higher aspect airfoil Most importantly added 5mm carbon fiber tube to the booms The changes make all the difference in how it flies. And still on three sheets of foam board!
AUW: 450grams (with 1300 3s battery) to AUW: 496grams (with 1300 3s battery) so about a 10% increase. All the changes: 5mm cf in the booms Booms taller and larger V stab Battery tray lowered for more room