Originally Posted by tbuick6
As someone posted earlier, the Glen lift off is a tad disappointing in the low-end department. For anyone who has the IMAX Hubble blu ray, that is the standard for how a NASA launch should sound.
My house and family are still recovering from that liftoff!
That is kind of like saying all cars sound the same. A Buick sounds the same as a Porsche right?
John Glenn was first launched on an Atlas which has one main and two sustainer engines powered by RP-1 (kerosene) and liquid oxygen. While those engines burned hot (I've felt a later Atlas version's engines during a launch), they made nowhere near the crackle that the solid rocket booster (SRBs) made during a Shuttle launch. Solid rockets sound a lot different than liquid rockets and the amount of energy coming out of the Atlas engines was nowhere near that of the SRBs.
In addition the Atlas recording used analog equipment and was likely just a transfer from NASA film with a lot of work by the foley artist. Hubble 3D was recorded on modern digital equipment using multiple recording locations. The earlier IMAX, such as The Dream is Alive, was mostly foley artist work for the launches. Hubble 3D is a real recording of a Shuttle launch and it is impressive considering the dynamic range that occurred during a Shuttle launch. Too bad it won't occur again.
So I certainly don't fault the filmmakers for the Atlas sounds. That is what an Atlas (of that vintage) sounded like.Edited by alk3997 - 12/19/13 at 12:03pm