lilcap....i plan on trying a magnum 52xls on mine. its a powerful engine if one can get em running right. ive used this engine before on a magic 300 xl...the red plane...and it had more than enuf power to pull vertical out of a hover. props ive used are a 12x4 and a 12.25x3.75....and the only difference i noticed between props was noise. i think your ys 53 would work quite well...