hello i just got my first turbine yesturday. p70 in a boomer sprint. mine is also this way. it has chips on the fan. the engine runs perfect though.. no balance problems nothing. i contacte my friend who sold it to me because i didnt notice it until yesturday. he said as long as no vibration it will be fine. he told me he knew nothing abou it. he said he just sent the engine and ecu in for the up grade for ecu and engine examined. he said he has flew it many times since then. the day i boufght it we ran it and sounds wonderful. very powerful. and today i ran few more times..i think as long as the other blades are not damaged inside its ok. take an object and carefully spin the fan. it should spin easy and smooth. let me know. wierd though isnt it we both have this..