<span style="color: rgb(51, 51, 51); font-family: sans-serif, Arial, Verdana, &quot;Trebuchet MS&quot;; font-size: 13px; background-color: rgb(255, 255, 255);">The APC 7" dia. x 4" pitch prop is recommende for HC2815 brushless motor (M-115on 3S LiPo). The E designation indicates it has a thinner hub and is not suitable for gas power applications</span>