shore you're rite nitroman, when i was flying i was'nt competing and what little competing i did do was thermal gliders which is more like a timed landing. with the cars i've pretty much always competed at the races, probably more than a thousand races over a 20 year period. when i got my first nitro car i used 10%nitro and 20% oil and although the motor ran it didn't run that good compared to the tank of blue thuder someone gave me at the track. the small motors seem 2 like at least 20% nitro they just run and idle better. when u have 2 much motor a restrictor and 15% nitro make it much easier 2 drive