Thanks for the comment and it reminds of something...
When I was not flying schedule I would fly bush aircraft and so many many times in the wee hours of the morning a good hour before sunrise/dawn I would stand on the dock, look out over the glassy water, listen for the sound of the loon or watch the fish jump leaving soundless ripples on the lake.
Then, climb up into the DeHavilland DHC-3 Float or Amphibious Otter and crank over the P & W R1340.
Smoke would billow from her four stacks, the dew on the windscreen would move towards the top and sides, the beast would come alive and it would seem to all Gods little creatures that all hell had just broke loose....

At the end of the day I would have a few more bucks to send home and would have enjoyed seeing, hearing and respecting dear old Mother Nature and Gods creatures as my career took one more step up the aviation ladder and I learned at least one thing new that day...

It is true that studies to produce quieter and more efficient engines during and after the Second World War were very very successful but were covered up.
There were not enough folks concerned enough about the planet at that time and the stockholder could not take a loss from their investments....

Yes aircraft engines of all types are noisy but so are motor vehicles and marine engines.
I will say no more in case the men in black coats show up to tell me to clam up...

:-X