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Old 05-04-2018, 01:36 AM   #106
Kyle
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First decent image of the Block V:

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Old 05-10-2018, 12:58 PM   #107
BrianJ
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Update v.180509 on OH:
Interstage and landing gear re-paint for Block5
(no change to performance yet).
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Old 05-10-2018, 02:26 PM   #108
boogabooga
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Are you modeling the Block 5 separately?
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Old 05-10-2018, 03:07 PM   #109
BrianJ
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Quote:
Originally Posted by boogabooga View Post
 Are you modeling the Block 5 separately?
No, it's enough work trying to keep up with one version :-)
If anyone has any figures on performance upgrades for Block5, do let me know, I can't find anything.


Cheers,
BrianJ
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Old 05-10-2018, 04:08 PM   #110
IronRain
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Not much on performance, but I saw this on Twitter today:

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Old 05-10-2018, 04:23 PM   #111
BrianJ
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Weird, I can't see the link in your post, but can see it in the quote.
Anyway, thanks for that - "roughly 10% extra thrust on the Merlin1D".
Wikipedia says 7-8%.
That will require a few changes in my add-on control algorithms, which desperately need overhauling anyway :-)
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Old 05-10-2018, 07:36 PM   #112
Kyle
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Elon Musk said today the Block 5 has an 8% thrust increase over the Block 4.
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Old 05-11-2018, 01:40 PM   #113
barrygolden
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once again super job.
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Old 05-12-2018, 11:01 AM   #114
BrianJ
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So, a couple of figures garnered from comments here and there:
Merlin1D thrust SL: 190,000lbs
Merlin1D VAC thrust: 220,000lbs

Also mentioned was "chamber pressure on Merlin1D is reduced during ascent to maintain thrust" - how is that done? Is it simple throttle control or are they changing the efficiency(ISP) somehow?

Insight from anyone who knows how rocket engines work is welcome! :-)

Cheers,
BrianJ
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Old 05-12-2018, 06:15 PM   #115
Kyle
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Simple throttle control per Elon Musk.
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Old 05-13-2018, 10:41 PM   #116
ale131296
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Elon also talked about a few seconds more of ISP in both first and second stage. MVac should be now more like 350s of ISP which is really good. Also, could you add more impulse on the RCS? The boosters can't rotate as fast as in reality and I don't know why, maybe making the RCS more powerful on the simulation it would be the easy solution?
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Old 05-14-2018, 10:27 AM   #117
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Quote:
Originally Posted by ale131296 View Post
 Elon also talked about a few seconds more of ISP in both first and second stage. MVac should be now more like 350s of ISP which is really good. Also, could you add more impulse on the RCS? The boosters can't rotate as fast as in reality and I don't know why, maybe making the RCS more powerful on the simulation it would be the easy solution?
I am working on this at the moment. Increasing the thrust exposed a bug in the re-entry guidance, so that's a bit more robust now. ISP of the MVac is already 361.8s, so that can stay as it is for the moment.


The booster rotation problem may be down to wrong moment of inertia and CoG - haven't paid much attention to that. Also, I wonder if the 2nd stage ignition gives a bit of a push to the 1st stage rotation. Also, firing up one engine early to increase torque helps a bit with the turn. So, I am looking at this :-)


Cheers,
Brian
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Old 05-14-2018, 03:31 PM   #118
ale131296
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Quote:
Originally Posted by BrianJ View Post
  ISP of the MVac is already 361.8s, so that can stay as it is for the moment.
Now that explains a lot of things from different flights I have done with this addon. I thought that ISP on the addon was lower than that but now I'm seeing the PDF file with the specs and it's true what you say. It's a very high ISP compared to the true MVac engine ISP. Hey don't have to feel any pressure, you're doing a great job, take your time, I'm sure it will end up being really good!!
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Old 05-15-2018, 05:59 PM   #119
ModeOneCharlie
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Hi Brian! I'm very excited to see the Block 5 variant on the pad in Orbiter - but now all my scenarios from TESS on backwards look like Block 5. Help!

(I've been creating scenarios with your wonderful add-ons, currently from TESS on back through FORMOSAT-5, with the goal of simulating all Falcon 9 v1.2 flights as realistically as possible. With a quick check of the texture files, I'm not sure just a renaming of a file will work, or where in a .cfg file I could add a line. Thanks in advance for your help?)

Charlie
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Old 05-22-2018, 11:48 PM   #120
BrianJ
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Update v.180522 on OH

Now supports up to 20 payloads, attach points defined in .cfg file
Thrust upgraded to Block5 specs
2nd Stage ISP reduced to ~350s
1st Stage cold gas(N)RCS thrust increased 20%
1st Stage cold gas(N)RCS fuel mass reduced 100kg
1st Stage inert mass increased 100kg
Quicker 1st Stage "flip" and Boostback-burn ignition sequence
More stable Re-entry burn calculation
Some cosmetic changes to booster, fairings
Added GraceFO and Iridium6 launch scenario

You are advised to delete(or move to subfolder) previous version "Test" scenarios before installing update, to avoid confusion!

Still to do:
Better ASDS and FRV location prediction

---------- Post added at 11:48 PM ---------- Previous post was at 10:12 PM ----------

Quote:
Originally Posted by ModeOneCharlie View Post
 Hi Brian! I'm very excited to see the Block 5 variant on the pad in Orbiter - but now all my scenarios from TESS on backwards look like Block 5. Help!
Hi, sorry for the late reply - must have missed your post.
Due to my lack of foresight/time and laziness, I never bothered to make different versions of the Falcon9 compatible in the same Orbiter install.
(It's actually a bit of a pain to go through all the code/meshes/cfgs/scenarios/etc. and change the folder structure).

So, you can either install the relevant version each time you need to change it. Or keep separate Orbiter installations for each version.
Sorry about that.

If you're only concerned about the visual appearance, you could possibly swap the previous version meshes and textures for the 1st Stage and Interstage only.

I think the last version before the Block5 re-paint was v.180321, if you need it, PM me your email and I'll send it over.

Cheers,
Brian

Last edited by BrianJ; 05-23-2018 at 12:00 AM.
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