are you sure!!! i read somewhere that you just need to drill the ply hole bigger to fit ring through so i did someone said if you remove the ring that the hole motor will fall apart as soon as the lock washer wears out .......i hate that rimefire and great planes has no info on this subject.................i hooked my 3 cell 1320 li-po up, to that rimfie it was so fast the plane started to get the shakes lol...........my tribute and yak54f can handle that extra power !!!i have the cap 580 and tribute ready to run the yak was crashed badly .....the power of the 4100kv brushless inrunner w/gearbox is insane compared to the rimfire.........i flew the cap 580 and i used a 2 cell 860 li-po with 9x4 prop well prop too small for that setup and it landed hard after the auto half power esc kicked in so i reprogramed esc to not turn power down and put the 10x3 prop on which rimfire recommends props 10x3.8,10x4.7,11x3.8 for 2 cel li-po
...............8x3.8,8x6,9x3.8 for 3 cell lipo ....so i was using the wrong prop on my 1st flight[sm=idea.gif]