My Tunigy 30cc pulls the Sukhoi around perfectly and with the 18x6 the verticles arn't fast but she just keeps climbing & i'm still running on a 25/1 mixture ,going to 40/1 this weekend which should see a slight increase in the top end , but she hovers & will pull out of the hover though again at a nice slow controlled manner. I'm still playing around with the CG & doing everything ten mistakes high but the performance of the plane & the engine especially in the lower rev range & speed have impressed me ,also the build quality of the SU26 is very very good !!.