Hmm... maybe we could use the skins of our metal airplanes as static speakers...
Charlie, how do static speakers work anyway?
I'd have to carry a High Voltage supply that could do double-duty to keep finger poking onlookers at bay at fly-ins :)

Finn

Mark R Steitle wrote:

Here is the answer to the muffler problem.  Active Noise Control.  No big, heavy, draggy muffler needed.   

 

<snip from “Canadian Driver” article>

…Active Noise Control is unique to this vehicle. Active Noise Control (ANC) uses sound waves generated from the audio speakers to cancel out any booming noise from the powertrain. The ANC controller uses a microphone to detect any noise and then generates a signal 180 degrees out of phase to cancel out the original noise.

<snip>

 

Mark S.