G day i have just completed my lark with magnum 70 hatori header and home made muffler. i am just curious as to you guys having to add weight to the tail, my magnum weighs more than an os50!
also i had to put my rx batt just behind tank under landing gear mount to get the ballance right .
i love the way it flies , my LHS suggested having 5 to 6 mm of up aileron (reflex i think) switched in for landing to help give it a nose up attitude to help slow it down. which works very well.my auw is 3200g