Barry is right about the tail wheel and push rods.The landing gear is a weak point but the plane lands so easy realy no problem easy fix.I used the ca hinges and did'nt have any trouble with them but remember what the manual said (slow flyer)fly only around half throttle unless pulling out a manuver.The os 91 had enough power to hover and it recovered nice,but if i build another i will put the 108 in it...most part enjoy....great plane got to get another one......HAVE FUN