How to fix whistling noisy foils with the Donaldson trailing edge sanding technique.

What's up fellow foil Junkies.

I just received the Armstrong HA525 foil and it whistled super loud out of the box.

Armstrong, being the amazing company that they are saw my post on the Armstrong Foil Riders group and immediately reached out to me offering to replace the foil.

I took it upon myself to sand the trailing edge to fix it myself.

I decided to put together this quick cell phone video showing how I fixed it. This technique works good on any foil. The HA195 tail noise can be fixed the same way.

Google Donaldson trailing edge for more information on this. A couple links are attached below.

Hey Armie! If you appreciate my help hook me up with some early release foils! I wouldn't mind being a member of the team.

😂🤙

https://infoscience.epfl.ch/record/16...

https://www.seabreeze.com.au/forums/S...