Insprucker said they were bringing in the LOX loading time and will continue to tune (I held by breath). The other think I noticed was a call out for "cyro-helium stir" very late into the countdown. Has anyone heard this before? Stratification mitigation in the COPVs?
A vid of what I think is the fairing after sep. Interestingly you can see the tiles inflating over time, starts on the left and moves right. Is it getting cooked or is something else happening?https://www.instagram.com/p/BUK6BQnBNuK/
Quote from: baldusi on 05/16/2017 08:10 pmQuote from: Targeteer on 05/16/2017 04:20 pm42698 INMARSAT 5-F4 2017-025A 1401.67min 24.50deg 69839km 381km 42699 FALCON 9 R/B 2017-025B 1410.43min 24.47deg 70181km 384kmRoughly a 1,570m/s deficit to GTO. That's almost Zenit-3SLB/Proton-M/Briz-M performance.Those have more stages too. Not bad for kerolox 2 stage.
Quote from: Targeteer on 05/16/2017 04:20 pm42698 INMARSAT 5-F4 2017-025A 1401.67min 24.50deg 69839km 381km 42699 FALCON 9 R/B 2017-025B 1410.43min 24.47deg 70181km 384kmRoughly a 1,570m/s deficit to GTO. That's almost Zenit-3SLB/Proton-M/Briz-M performance.
42698 INMARSAT 5-F4 2017-025A 1401.67min 24.50deg 69839km 381km 42699 FALCON 9 R/B 2017-025B 1410.43min 24.47deg 70181km 384km
Correct. The three stage. The SLB/M is a two stage.
Does anyone really think a burn terminated almost exactly at 36,000km/hr was a burn to minimum residuals? Seems very unlikely. Probably close, but still a little gas left in the tank.
Parameters for the target orbit are not available, he said, because the upper stage engine is programmed to keep firing until it is almost out of fuel, a technique rocket engineers call a “minimum residual shutdown.” The tank-draining burn is intended to ensure the Inmarsat 5 F4 satellite goes into as high of an orbit as possible, reducing the work the craft’s own thrusters need to do in the coming months.
There were a few frames of the LOX tank view right before they lost signal during the coast. I was finally able to screencap one from Youtube by using <comma> and <period> to go frame-by-frame.
Quote from: baldusi on 05/16/2017 08:10 pmQuote from: Targeteer on 05/16/2017 04:20 pm42698 INMARSAT 5-F4 2017-025A 1401.67min 24.50deg 69839km 381km 42699 FALCON 9 R/B 2017-025B 1410.43min 24.47deg 70181km 384kmRoughly a 1,570m/s deficit to GTO. That's almost Zenit-3SLB/Proton-M/Briz-M performance.How is that a deficit to GTO? It is almost twice as high as a standard GTO orbit.Or am I missing something?And what do you mean with almost Zenit/Proton performance?
Quote from: Kasponaut on 05/16/2017 09:40 pmQuote from: baldusi on 05/16/2017 08:10 pmQuote from: Targeteer on 05/16/2017 04:20 pm42698 INMARSAT 5-F4 2017-025A 1401.67min 24.50deg 69839km 381km 42699 FALCON 9 R/B 2017-025B 1410.43min 24.47deg 70181km 384kmRoughly a 1,570m/s deficit to GTO. That's almost Zenit-3SLB/Proton-M/Briz-M performance.How is that a deficit to GTO? It is almost twice as high as a standard GTO orbit.Or am I missing something?And what do you mean with almost Zenit/Proton performance?Zenit 3SL running from the equator can do around 6 tons to GTO-1500. Proton M+ (enhanced) can do around 6.3 tons.Both use 3 stages to get there (Blok D and Briz M accordingly).
Quote from: Targeteer on 05/16/2017 04:20 pm42698 INMARSAT 5-F4 2017-025A 1401.67min 24.50deg 69839km 381km 42699 FALCON 9 R/B 2017-025B 1410.43min 24.47deg 70181km 384kmRoughly a 1,570m/s deficit to GEO. That's almost Zenit-3SL/Proton-M/Briz-M performance.