|  | | OT: Video na pátek 26. 9. 2011 / 12:07 | |
| | Jak jsem tak hledal, narazil jsem na ještě jednu zajímavost:
Came across this in a Nov, 1956 Popular Mechanics mag:
Quieter Airline Flights
Tests on the Lockheed Super Constellation have shown that the position of the plane’s propellers as they spin has a serious effect on the noise level in the cabin. During the tests it was found that the two right engines running together at the same speed made less noise when they were 60 degrees out of phase. Under ideal phasing conditions, the noise level in the cabin can be cut by 15.5 decibels, mostly in the low tones which are difficult to muffle.
Zdroj - diskuze zde:
http://www.historynet.com/the-legendary-lockheed-constellation.htm |
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