Only extendable.
Another set of Qs on the IUS:1: What was the length of the interstage structure?
2: Extension time of the SRM-2 EEC?
3: Specific impulse and thrust of the REM thrusters?
I haven't found a listing, but I did find that the post Stage 2 vernier burn lasted 6 m 40 sec and used 94.5 pounds of propellant (using multiple REM thrusters). The thrusters used hydrazine (N2H4) mono-propellant.
Quote from: edkyle99 on 09/05/2014 05:26 pmI haven't found a listing, but I did find that the post Stage 2 vernier burn lasted 6 m 40 sec and used 94.5 pounds of propellant (using multiple REM thrusters). The thrusters used hydrazine (N2H4) mono-propellant.I found it interesting the motors were undersized to make sure that there was no over burn and the vernier burn made up for the intended shortfall and any additional shortfall. If there was a hot motor then the vernier burn was much shorter.
Quote from: DaveS on 09/02/2014 04:10 pmAnother set of Qs on the IUS:1: What was the length of the interstage structure?I'm still digging for this number. It is surprisingly hard to find.
Quote2: Extension time of the SRM-2 EEC?17 seconds, according to an old user manual. It took place immediately after staging. The Stage 2 burn did not start until about 2 minutes later.Quote3: Specific impulse and thrust of the REM thrusters?I haven't found a listing, but I did find that the post Stage 2 vernier burn lasted 6 m 40 sec and used 94.5 pounds of propellant (using multiple REM thrusters). The thrusters used hydrazine (N2H4) mono-propellant. Typical ISP for such thrusters is 220-230 seconds, give or take. I found one mention of Kaiser-Marquardt as the thruster manufacturer, but no details. - Ed Kyle
Thanks Ed! Just to make sure I have gotten things right: There's a ring at the top of the conical section of the interstage and it's that one that is 100" in diameter? Or is it the where the conical section meets this ring?
Ed, do you have a number on the ID on the ring with the arrow pointing to it? If I have gotten things right, the ESS part of the second stage rests on it when the two stages are still together.