On 30/01/2015 23:21, wrote:

Jets are very noisy, albeit directionally so in flight, there's not
much left to investigate about that. It's more a question pilots and
airfields reaching an understanding about their use. Surely an
airfield management or gliding club chief instructor can ban jet
glider self launches (which would be outwith the glider's TC any),
unauthorised powered low passes and/or use within a specified
distance from the airfield? That is what I am planning to
self-impose if and when I get my turbine installed. It would be a
sorry state of affairs if an airfield couldn't keep that level of
discipline.

There were a few Jet JS1's a the SA Grand Prix Qualifier. Some of these
got fired up a few times when I was around the airfield. There were some
fly passes, run ups before launch and once, after finish, when 6 or 7
gliders were looking for place to land from 50m finish altitude at the
same time.

Yes, there are noisy, but not that noisy. My impression is that they
were less intrusive or annoying than the local flight school's Cessna
152. The jet noise was more of a novelty than a discomfort. I did not
notice anybody cringing with their fingers in their ears.

One or two jet pilots did ground run ups before launch. I suspect they
were just being cautious rather than this being a required procedure.
But if you have a "zero jet noise on the airfield" policy, you may be
constrained from doing a pre-launch run-up.


Ian