QuantumCurse wrote:connerdstines wrote:They were all like that. That's why the B flat(on chopper level 5) of the four port row is the most audible when you listen to a 4/5 Thunderbolt.
Interesting. Does that mean the 4 port tone is more dominant in the pitch?
Yes, because it receives more air coming into the rotor since the four port side faces the siren's intake. Same with naturally aspirated sirens too, for example you will hear the 12 port side of a 9/12 ACA siren slightly louder than the 9 port side, since these have the 12 port side on the same side as the siren's intake, and that side therefore receives the most air. This is reversed on Federal 9/12 sirens, where the 9 port side is dominant, because it's on the same side as the intake. If you listen to a Model 2T, it's the same 4/5 rotor, but both sides are open and take in roughly the same amount of air, so neither note is really as dominant as it would be if the intake was restricted to one side.
Down to a Thunderbolt chopper, still a few goofy flashlight-siren combos, and a Model L.