I bought a 20 foot sail boat to sail the apostle islands on lake superior. I would like a fog horn, but don't want to spend like 10k/have a 900 pound horn on the front of my boat. Any way to get that iconic BWOOOAAAAAAAAAHHHH Sound on the cheap?

I might be wrong but AFAIK the hornsresonant frequency is dictated mostly be the inertia of the moving part. As such you wont get the same pitch using a smaller generator.
I suggest the most feasible way to get as close to the sound youre looking for while leaving the volume just a matter of how much you're willing to pay, is a recording and (a) large speaker(s) with a mock horn to look the part.

>>2047003
>jogger up ahead wearing earphones
>approach from behind
>ride up to within 6ft
>BLLAAAAAT!!!!!!
You glorious bastard. :^)

Get one of these
>https://youtu.be/hxWFmwA_-vU?si=agW_G2-rH20ZUjdI

>>2046958 (OP)
No, they sound like that because they are huge and have a huge air compressor attached. You can not put that on a smallish sail boat.

>>2046958 (OP)
Sumburgh is truly impressive to visit.