On Saturday, 17 October 2020 at 00:53:50 UTC+1, wrote:
Much of the noise you hear from any propeller-driven aircraft comes from the tips of the propeller breaking the sound barrier. That won't change between an electric vs petrol engine. The longer the propeller, the faster the tips move.

It does happen, but rarer than you think. The Harvard is an example that comes to mind.

For me, the only one. Maybe design has moved on a bit since then