I believe that they are homelite 26cc engines, but there is no indication on the engine as to what they really are. Went and flew my rascal last night, and the fellow said they spun 18x8 props, and that she flew real well with that combo. I also have a nib saito1.50, thinking about picking up another one and using them instead of gas, I guess it just depends on what happens when I fire up the 26cc gassers. Gonna try to do that this weekend, will let everybody know how it goes.