The XTRM 2814/06 is a 1410 KV Brushless Outrunner with a current capacity of 40 amps @ 60 seconds. A maximum efficiency of 80%, a no load current @ 10vdc of 2.1 amps and an internal resistance of 50 Mohms. This outrunner has a 4mm shaft and is designed to run on 7-10 NiCad/NiMH cells or 2-3 LiPo cells. A 10x7 prop on 2 cells or a 9x6 on 3cells is great for all around sport flying. Includes Radial Mount, 4mm Collet type prop adapter and 3.5mm Gold Plated Bullet Connectors. This motor weighs 3.5 oz. and the dimensions are 35 x 36mm.