20x8 on a 1.8 or 2.1? I think it would be too big on the 1.8. I am running a Zinger 18x6-10 on mine and it will pull out of a hover, though I haven't tried it in temperatures above 70 degrees yet. Do you already have the APC? If so, then use it and see how it works for you. If not, get the Bambula, Moki, Zinger, etc.