Only pro's on my account.....
Used a WM400 on a Velocity-rc Slingjet.
First without intake lip.... very noisy and medium performance/power.
Then I made a lip from 3 layers of 3mm depron. Lenght: 2cm and sanded into a nice round shape.
Result: 30% more power and 50% less noise.
Feels like going from 3s to 4s lipo.....
Since then I have always used intake lip / ducting / exhaust cone
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