HY I HAD A FASCINATION WITH A 46 LA ON IT AND I HAD ALMOST UNLIMITED VERTICAL WITH A APC 10.5-6 PROPELLER ON IT BUT IT ONLY WEIGHED ABOUT 4 3/4 LBS. I HAD TO STREGHTHEN THE LANDING GEAR AFTER THE FIRST LANDING. IT WOULD KNIFE EDGE WITH ABSOLUTELY NO COUPLING AT ALL.