# High-pitched sound
**URL:** https://foil.zone/t/high-pitched-sound/21391
**Category:** Propulsion System (Motor, Gears)
**Created:** [August 4, 2024, 2:51pm UTC](https://foil.zone/t/high-pitched-sound/21391 "2024-08-04T14:51:15Z")
**Posts on this page:** 5
**Page:** 1
### Author:  [@Pavel](https://foil.zone/u/Pavel)
#### Post date: [August 4, 2024, 2:51pm UTC](https://foil.zone/t/high-pitched-sound/21391/1 "2024-08-04T14:51:15Z")
Sometimes at certain speeds, I hear a high-pitched creak or squeak. What’s up with that? Is it the propeller, the motor, or something else?
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### Author:  [@Larsb](https://foil.zone/u/Larsb)
#### Post date: [August 4, 2024, 2:56pm UTC](https://foil.zone/t/high-pitched-sound/21391/2 "2024-08-04T14:56:12Z")
Cavitation probably.
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### Author:  [@Pavel](https://foil.zone/u/Pavel)
#### Post date: [August 4, 2024, 3:10pm UTC](https://foil.zone/t/high-pitched-sound/21391/3 "2024-08-04T15:10:53Z")
I forgot to mention that the sound has a specific pitch, which I don’t think is characteristic of cavitation.
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### Author:  [@Larsb](https://foil.zone/u/Larsb)
#### Post date: [August 4, 2024, 3:16pm UTC](https://foil.zone/t/high-pitched-sound/21391/4 "2024-08-04T15:16:48Z")
Trailing edge whistling might also be a cause. I had it on my YPRA wing
> **[The definitive solution to fins and foils whistling/humming: The "Donaldson...](https://www.seabreeze.com.au/forums/Stand-Up-Paddle/SUP/The-definitive-solution-to-fins-and-foils-whistling-humming--The--Donaldson-trailing-edge-?page=1)**
>
> The Definitive Solution To Fins And Foils Whistling/Humming: The "Donaldson Trailing Edge" and other stand up paddle discussion in the Seabreeze general forums, page 1
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### Author:  [@Pavel](https://foil.zone/u/Pavel)
#### Post date: [August 6, 2024, 7:03am UTC](https://foil.zone/t/high-pitched-sound/21391/5 "2024-08-06T07:03:36Z")
I sanded the wing without applying the “Donaldson Trailing Edge” technique, only smoothing the edge slightly. As a result, the noise has become much less frequent.