RE: Does your club noise test turbine jets?
I was wanting to fly turbines at our our local club, but to do that we would need to extend the runway. I was lucky enough to have three friends with turbines to bring them out and put on a demonstration for the club. All the officers were there to see how loud they would be as we have neighbors half a mile away. What they found was that although turbines were significantly louder (as measured in db) on the ground, their sound would dissipate quickly whilst (thats for you guys) airborne and were actually much less intrusive than gasoline engines. It was decided that our sound level, 92db at 3 meters would not apply to turbines as the nature of the sound was so different that the existing test was not valid.
Maybe a demonstration including some people from the general public may help your cause. Good luck!