RE: 2-STROKE /4-STROKE FOR 3-D FLYING???
YS 63 or saito 72. Four strokes have the best power for 3d, but its harder to mount in a funstar i run 46 ax's in mine and really happy with them. prop apc 11.5/4 or 12.25/3.75.
Yes 4* would be good for the 524 stroke