Corsairjock I didn't have to add any weight to mine. Saito 150 with my battery pack all the way forward came out perfect. They were back ordered on the 16-8 at the time which is still a little bit to much prop I think. So I tried the 16-10 first to see what the revs were then cut it down to 15 then 14.5 was perfect. Was also able to get a more scale looking prop by cutting it down and rounding the tips. I know that it doesn't help performance but I have plenty to spare with the 150 anyway. Still screams even with the modified prop. Will need to make another one broke it last weekend so an APC for now.