Atlas Outrunner 2921/10

.25 - .40 size glow conversion

5-4/5 oz. weight, 1-3/8" diameter, 1-7/8" case length, 5mm motor shaft with 2 ball bearings. INCLUDES Radial Mounting System and aluminum prop nut. For 3-4 lipoly or 8-12 NiCad/NiMH cells. Current to 45 amps and propellers from 11x7 to 12x6.