when you build the orion id strongly advise you to: use better pushrods (snakes) with metal, adjustsable clevises use small servo's like hitec hs 55's stiffen the spar using vertical grained shear webs between each of the wing ribs (1/16th thick balsa either side of the spar) enlage the rudder to make it about another 1.5 cm deeper for better controll you may need to fiddle with the contol horn and cutouts in the ellevator to achieve the correct amount of throw, even with the enlarged rudder. i had to remove part of the control horn for the rudder or itd foul up on the fuselage. these mods done, the orion will fly brilliantly, esp if you keep the weight down further with a small battery pack and use solarfilm rather than profilm, you can just squeeze in an 800mah AAA battery pack into the nose so no need to get a 2/3AAA size one., get the bigger AAA type and use less lead !