at the lake we're skiing home owners appear to strive to ban skiing.
One of their many reasons they want to ban skiing is the sound
skiboats produce. The city council is sensitive for their complaints
and we have to fear that we are going to be forced to move the slalom
course more to the middle of the lake. Currently we are already 80
meters out of shore, and since this is windy Netherlands, windforce
4-5 is enough to make the slalom course too choppy to perform.
Increasing the distance from the shore to the course is therefor not
an option for us.
To oppose moving the slalom course more to the middle of the lake I
would like to make a statement for the city council that the amount of
sound produced by skiboats is nowadays not "too bad" anymore, thus
questioning the justification of the complaint about the produced
I think I have three arguments to support this:
1. Number of speeds licences has gone down over the years by almost
40%. Just a fact.
2. Distance from shore to slalom course increased some years ago from
50 to 80 meters. Also just a fact.
3. Sound levels of skiboats have gone down considerably.
To support this last issue I'm looking for information on:
a. a comparison on sound levels of skiboats (now and 10 - 15 years
ago(i.e. before the improved sound mufflers were introduced)). This
info is required to imply that home owners already have received a
sound reduction because of improved technology.
b. the amount of sound produced by a modern skiboat at various
distances (like 25 - 50 - 75 - 100 - 125 m) measured. This info is
required to support that most sound reduction has already been
attained in earlier days by increasing the distance from the shore to
the course from 50 to 80 meters and (hopefully) not so much more can
be gained anymore by increasing the distance another 25 - 50 meters.
Note that sound levels measured at the typical 1 m from the exhausts
is not what I am looking for since such figures do not reflect the
sound level the home owners have.
Any idea where I can find this kind of info ?