Somehow I messed up the following in trying to quote from an earlier post. Sorry===================================================STP-2 Max-Q is at T+00:42, a full 27 seconds earlier than for Arabsat-6A at T+01:09. This is going to be interesting.====================================================My comment(s):Am I missing something on the other side of T-0 or have the times changed for the fuel and oxidizer loading?SpaceX Launch Director verifies go for propellant load It is llsted as -53 minutes. My memory tells me it used to be 38 minutes.1st stage RP-1 (rocket grade kerosene) loading begins This also, according to my memory and calculation, suggests this is also move forward by 15 minutes1st stage LOX (liquid oxygen) loading begins Another 15 minute change Also the final satellite deployment is at: 03:34:09Prior indications were that this is a 6 hour mission. Is some interesting stuff being left out of the press kitor is my imagination running wild or ?
Everything I saw before today said around a 6 hour mission, maybe that was wrong. All of the engine burns are listed in the press kit.
Somehow I messed up the following in trying to quote from an earlier post. Sorry===================================================STP-2 Max-Q is at T+00:42, a full 27 seconds earlier than for Arabsat-6A at T+01:09. This is going to be interesting.====================================================My comment(s):Am I missing something on the other side of T-0 or have the times changed for the fuel and oxidizer loading? SpaceX Launch Director verifies go for propellant load It is llsted as -53 minutes. My memory tells me it used to be 38 minutes.1st stage RP-1 (rocket grade kerosene) loading begins This also, according to my memory and calculation, suggests this is also move forward by 15 minutes1st stage LOX (liquid oxygen) loading begins Another 15 minute change Also the final satellite deployment is at: 03:34:09Prior indications were that this is a 6 hour mission. Is some interesting stuff being left out of the press kitor is my imagination running wild or ?
Quote from: duh on 06/24/2019 08:15 pmSomehow I messed up the following in trying to quote from an earlier post. Sorry===================================================STP-2 Max-Q is at T+00:42, a full 27 seconds earlier than for Arabsat-6A at T+01:09. This is going to be interesting.====================================================My comment(s):Am I missing something on the other side of T-0 or have the times changed for the fuel and oxidizer loading? SpaceX Launch Director verifies go for propellant load It is llsted as -53 minutes. My memory tells me it used to be 38 minutes.1st stage RP-1 (rocket grade kerosene) loading begins This also, according to my memory and calculation, suggests this is also move forward by 15 minutes1st stage LOX (liquid oxygen) loading begins Another 15 minute change Also the final satellite deployment is at: 03:34:09Prior indications were that this is a 6 hour mission. Is some interesting stuff being left out of the press kitor is my imagination running wild or ?Have to wonder if there was some added parameter to the mission.. Air Force wants to demonstrate mission requirements met while having flexibility for a 15 minute launch window(after fueling commences)?Being forced to launch with less dense LOX and RP1 than normal would explain the ASDS move far downrange.. Correct?Feels like the Air Force is making SpaceX demonstrate they're still capable even with both hands tied behind their backs.. The 6 hours goes out to the final burn to lower orbit and deplete all propellants if I remember correctly?
Have to wonder if there was some added parameter to the mission.. Air Force wants to demonstrate mission requirements met while having flexibility for a 15 minute launch window(after fueling commences)?Being forced to launch with less dense LOX and RP1 than normal would explain the ASDS move far downrange.. Correct?Feels like the Air Force is making SpaceX demonstrate they're still capable even with both hands tied behind their backs.. ?
Quote from: TrueBlueWitt on 06/24/2019 08:28 pmHave to wonder if there was some added parameter to the mission.. Air Force wants to demonstrate mission requirements met while having flexibility for a 15 minute launch window(after fueling commences)?Being forced to launch with less dense LOX and RP1 than normal would explain the ASDS move far downrange.. Correct?Feels like the Air Force is making SpaceX demonstrate they're still capable even with both hands tied behind their backs.. ?This is the same timing as the previous FH flight. It doesn't using the F9 timings.
Will they use the F9 prop loading procedure for Falcon Heavy in the near future?My reasoning is so that it can get more performance when launching heavier payloads or when going to extreme orbits (geostationary, hyperbolic, or several orbits like in STP-2).
Is SpaceX still putting tail numbers on each booster? Is soot obscuring them or am I looking in the wrong place?
https://twitter.com/elonmusk/status/1143287719075950593QuoteOdds of center core surviving are about 50% imo, as it’s coming in about 4 times faster than a rifle bullet
Odds of center core surviving are about 50% imo, as it’s coming in about 4 times faster than a rifle bullet
OK, since this mission has been on the books for quite a while even before B3 and B4 if I remember right....they had to be planning a multi-droneship capture at that time. Since they only have one drone ship currently, the boosters have to RTLS and they figured why not try to catch the center core. This one does seem to be on the edge of "survivable" So questions:How many times has this mission changed over the years? When it was announced...and if it had the same mission as now....I don't see how it could not be 100% expendable. Could the 2nd stage even do it at that point in time?Other question....Has there ever been a mission with this many orbital requirements/changes and a disposal burn?
[...]From: 720 km x 720 km x 24 degTo: 6000 km x 12000 km x 43 degI calculate [...] 2829.9 m/s from the second to third orbit.Enter initial perigee height (km): 720Enter initial apogee height (km): 720Enter required inclination change (deg): 19Enter required perigee height (km): 6000Enter required apogee height (km): 12000Burn at 720.0 km: theta1 = 0.00 deg, dv1 = 1507.4 m/sBurn at 12000.0 km: theta2 = 19.00 deg, dv2 = 1440.6 m/sdv = 2947.9 m/sBurn at 720.0 km: theta1 = 4.25 deg, dv1 = 1625.8 m/sBurn at 12000.0 km: theta2 = 14.75 deg, dv2 = 1204.1 m/sdv = 2829.9 m/s
Any chance the 2am delay isn't official yet because they are discussing a scrub instead? I've got to decide whether to get on the bus at KSC...
Quote from: cscott on 06/25/2019 12:35 amAny chance the 2am delay isn't official yet because they are discussing a scrub instead? I've got to decide whether to get on the bus at KSC...Could be wrong, but honestly if it was an official delay/scrub spacex would have tweeted by now, and that’s not the case, wondering if someone on clock team goofed?