Full down elevator and full left rudder from a knife edge stall at low throttle (WAAAYYYYY up high please!!!) then go to about half throttle. As the plane falls play with the amount of aileron you feed in. Too much will make the plane roll out of the knife edge. you cant just slam the aileron stick to one side or the other. you may have to do this several times before you fiqure out the sweet spot. I have three planes (u-can do, GB extreme 330, and a razzel) and all will knife edge spin but the secret was feeding the proper amount of aileron in while it was falling. the u can do is the most graceful with a very smooth rotation. The Extreme is the trickest to keep in the KE spin but it will do it. The razzel was the easeist and will wind up in a 2 revolution/sec spin that is just pure scary! ( it also falls toward the earth faster while doing the spin than the others)

take care
z123