OS 25 AX 12.6 oz (with muffler) 9x5 10x5 prop
OS Surpass 30 10.4 oz (with muffler) 9x6 10x6 prop
OS Surpass 40 13.3 oz (with muffler) 10x6 12x6 prop

they all are pretty close within weight, i'm assuming my 26 4-stroke weighs approx the same as the 30 4-stroke...and that my TT 25PRO is comparable in weight to the 25 AX