|I need one of these. For reasons.|
As a reminder, security guidelines prohibited recording/photographing anything once inside the security perimeter, so there is a lack of pictures from many of the interesting places we visited...and because I didn't think ahead, neither pen nor paper was in my repertoire...so I'm digging through the recesses of my less-than-perfect memory for much of the information from 'Day 1'. If I happen to miss a detail or two, feel free to mercilessly mock me...or politely correct me - I'm simply pleased you're reading this.
After passing through the gate, we only had a short journey to our first stop. We had to break into two smaller groups to make the tour through the areas more manageable. At our first stop, an OATK engineer gave a brief, but informative, description of one of the omniaxial gimbal bearings being developed for a future SRB (though the one on SLS is very similar). The bearing consists of multiple, alternating layers of a rubber compound and aluminum (I think), which allows hydraulic actuators to move (gimbal) the SRB's nozzle +/- 8 degrees to maintain a proper thrust angle. If your eyes glazed over after reading that, the short of it is this allows the rocket to steer a bit to make sure it's heading in the correct direction.
|"Ares I-X launch 08" by NASA|
Sandra Joseph and Kevin O'Connell
|Our group in front of one of the mixers.|
Credit: Orbital ATK
Unlike liquid-fueled engines which have their fuel pumped to them when needed, SRBs need to have the fuel 'cast' into a casing. This casting occurs in a VERY large building, with deep pits designed to hold the huge motor segments while the putty-like fuel is poured/dropped/fed into casings. Since SRBs cannot be actively throttled, varying levels of thrust can be passively achieved by casting the fuel in a particular shape. Since the fuel burns from the inside of the casing outward, the fuel's surface area will change over the duration of the burn...and a change in surface area will directly impact the amount of thrust being generated. This casting is achieved by placing a mold into the segment casing while the fuel is being poured, which creates the desired shape. The three middle segments use the same mold, but the forward and aft segments require molds specifically designed for them.
|Other than the actual booster test, I sorely|
wanted a picture of the X-Ray facility.
We ended our day by taking part in a NASA-televised conference featuring many of the key people involved in developing not only the new boosters, but the SLS program as a whole. I've seen Todd May (NASA SLS Program Manager) speak at a couple different events, and I quite like him. It's obvious he's very intelligent, but has an easy manner to his speech that renders him immediately likeable. I've also had the pleasure of hearing Bill Gerstenmaier (NASA Associate Administrator Human Exploration and Operations) speak once before. Though there was not a lot of new information gleaned from the assembled team, it was still an excellent experience and helped set the stage for the next day's static firing.
And on that note, I'll end 'Part 2'. If you're interested in watching a short video about much of what our group saw, please take a look at the NASA Marshall-produced video below. Thank you again for reading, and I hope to have 'Part 3' up soon.