Ok, here's a question for the engine gurus, specifically ones running the 170cc motors. From my searching, it seems all 170cc engine break the 100 dB mark except for the ones running a 3 blade prop. Based on what I read, it seems a significant amount of noise comes from the speed the prop tips are traveling. Also, prop ripping comes from an engine being under-propped.
1) Is there any evidence that suggests that 170cc engines running 2 bladed props break the 100 dB mark simply because they are turning bigger (I.E. 31+") props?
2) What is different between a prop just being loud because of size and prop rip?
1) Is there any evidence that suggests that 170cc engines running 2 bladed props break the 100 dB mark simply because they are turning bigger (I.E. 31+") props?
2) What is different between a prop just being loud because of size and prop rip?