hi guys been working on my Sopwith pup balsa USA an my top flite p-47 recovered have the corsair set for next winter build project have electric retracts an im waiting for the top flite arf wheels the are 4.5" an look great used a 1/4" hex head bolt to use as the shaft on my robart retracts works great but the wheels at tower are always on back order you can paint them which in the scale bird i'm doing has white wheels all good you guys need to get on NASA Scale on face book an see about joining NASA scale an flying in the scale events its a great time at the events an your get to rub shoulders with some of the master builders in the hobby check it out guys they can answer question of how too s and fly this bird your building