Well I guess I need to read the manual or just keep doing what works for me - Saitos must have lower compression so I lose some rpm but they idle and transision well. I use only two different fuels both 10%. I need to use special fuel for my BVM 96 ducted fan - 23% oil. All other motors use 10% or I sell them. I have no problems with my Saito 120, 180, 325 older single plug or 450 new dual plug. The OS 108 and 160 are happy and so is the Webra 120 and Laser 120. I sold my old Moki because it liked 0% and I will not have another can of fuel. I have tried one gallon of 30% and the 450 really drank it fast! I find I have to richen the needle when I go to higher Nitro and then have shorter flights. I probably go through 5-6 ($45 per) cases a year so every dollar adds up. I have not had any problems with power to weight ratios and get "scale" or better performance from my planes. I prefer to fly in a scale manner most of the time unless I get a hair up my rear.
I would use 0% nitro if I could find and get away with it.
ORIGINAL: bullet65
carlbecker saitos manual states at least 15% nitro.i dont have the big ones but have a 91 and 72 and they like 20 to 30%
For your engine choice decide how you want the plane to fly. Lots of folks like the "need for speed". Sometimes I do, keep your plane light so it flys well. Try a 8" pitch and 10" pitch prop to see the change in performance. Keep the tail light and put heavy items up front if it doesn't balance. Radial Warbirds usually have a short coupled nose. There is room in the cowl to pack things in there safely. Keep us posted on how things work so everyone learns.
Carl