Okay you want to know how I know this, right?
Well, Better Gwinnett has been fortunate to have the support of a very intelligent, real live rocket scientist. In his current position, he is exposed to FAA and aircraft data on a daily basis and knows how to obtain and analyze independent data available from the FAA.
If you look at the two linked charts you will see that the Cessna 172 and Cirrus SR 22 single engine prop aircraft, a Beech Baron 58 twin-engine prop, and a Beech Jet are 4 commonly used aircraft operating at Briscoe.
Notice that the Cessna 172 and Cirrus SR22 aircraft are about 15 - 20 decibels quieter than the Beech Baron 58 and Beech Jet. Propeller aircraft using LZU are anywhere from mid-50s decibels on approach to the upper 70s decibels range. You will also see that the Beech Jet produces approximately the same noise volume as the passenger jets projected to operate at Briscoe, and that the loudest jet, a 737-700, is 25 decibels louder than a Cessna 172.
You will also see that the noise “footprint” for a 737-700 is 16-miles long and almost one-mile wide, while the “footprint” for the Beech Baron 58 prop aircraft, is only 8-miles long and approximately one-half mile wide.
Well if you live in the fantasy world in which Brett Smith (Propeller Investments), Mike Royal and Paula Hastings (both Fly Gwinnett Forward) live, that would be correct. Of course, if you live in the real world like most people in Gwinnett County then you won’t be surprised to find out large jets are louder than the prop aircraft which currently use Briscoe.