My recommendation is to use the 15 vice the 10 given the weight aand the way Cubs
behave on takeoff. I currently fly a 7 pound VK Cherokee on a 10 and a 9 pound
80's vintage pattern plane on the 15. The 15 gives the power of a hot .90 nitro while
the 10 has the power of a Super Tigre .56 if that helps yyou get some better reference