The acoustic big bug propeller signature is rpm syncronized, yes?
Its loudness gets bigger when you take off, right?
Just what makes each burp occur?
Is it ambient pressure collapsing vacuum entrails trailing behind blades topside (suction)?
Or is it a complex mixture combined with acoustical punchthru by the impinging leading blade edge into  undisturbed atmosphere? There is interaction also occuring quad center and each outreach arm.
Sound is created on a molecular level by shockwaves. It occurs to dissipate the separated air pressures spread apart by the pump, propeller.
Stock prop is fine thread whilst silent is coarse thread. Fine thread receives more axial tension, equivalent to gripping (compliant control) greater air surface (the contacted atmosphere) wrt time too. Obviously all rotating mass acts as gyre, stabilizing against orientation changes. Fine thread must spin fast to advance axially meaning stock motors rev high favoring very gradual torque demands as rpm revs. Fine thread must spin fast trumping psuedo impassible plane created by quad high rotation, acts alike to "winged" flyers, same impassibility
But the stock noise scares and irritates esp hostile seagulls and the like potentially inviting injurious encounter by attract.
What needs to be improved is quietness.
What is uncertain is the resultant craft response in "fine control" no different than setting torque on the stud's nut. Its much more precise using fine thread.

The acoustic big bug propeller signature is rpm syncronized, yes?
Its loudness gets bigger when you take off, right?
Just what makes each burp occur?
Is it ambient pressure collapsing vacuum entrails trailing behind blades topside (suction)?
Or is it a complex mixture combined with acoustical punchthru by the impinging leading blade edge into  undisturbed atmosphere? There is interaction also occuring quad center and each outreach arm.
Sound is created on a molecular level by shockwaves. It occurs to dissipate the separated air pressures spread apart by the pump, propeller.
Stock prop is fine thread whilst silent is coarse thread. Fine thread receives more axial tension, equivalent to gripping (compliant control) greater air surface (the contacted atmosphere) wrt time too. Obviously all rotating mass acts as gyre, stabilizing against orientation changes. Fine thread must spin fast to advance axially meaning stock motors rev high favoring very gradual torque demands as rpm revs. Fine thread must spin fast trumping psuedo impassible plane created by quad high rotation, acts alike to "winged" flyers, same impassibility
But the stock noise scares and irritates esp hostile seagulls and the like potentially inviting injurious encounter by attract.
What needs to be improved is quietness.
What is uncertain is the resultant craft response in "fine control" no different than setting torque on the stud's nut. Its much more precise using fine thread.