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Old 10-13-2019, 05:06 PM   #61
Kyle
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So I reviewed 4throck's Saturn IB and I honestly didn't see anything wrong as far as unit conversions go so I'm kind of baffled as to why it's underperforming.

As far as the LEM goes I'm satisfied that, barring some absolute path cleanup, it's done at least enough to complete missions before Apollo 15.

There's a pretty serious VB bug though that I've raised to Fred's attention before: Landed VB vessels don't jettison other VB vessels properly. The LEM ascent stage, for example, spawns on the ground under the descent engine rotated about 45 degrees from horizontal. EVAs do the same too.

Additionally, VB events based on altitude appear to be based on whatever SurfaceMFD is showing instead of the actual altitude from the lunar surface (OrbiterSound has the same problem too). I'm trying to trigger callouts & lunar dust being kicked up from the LEM descent engine based on altitude.

I'd strongly recommend against releasing this until Fred finds time to continue developing VB.
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Old 10-13-2019, 09:29 PM   #62
fred18
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Quote:
Originally Posted by Kyle View Post
 So I reviewed 4throck's Saturn IB and I honestly didn't see anything wrong as far as unit conversions go so I'm kind of baffled as to why it's underperforming.
maybe 4throck is using complex mode? just guessing, I have no idea why the performance could be so different


Quote:
Originally Posted by Kyle View Post
 There's a pretty serious VB bug though that I've raised to Fred's attention before: Landed VB vessels don't jettison other VB vessels properly. The LEM ascent stage, for example, spawns on the ground under the descent engine rotated about 45 degrees from horizontal. EVAs do the same too.
TBH it is more an Orbiter bug, but I can see if I can find a work around.

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Originally Posted by Kyle View Post
 Additionally, VB events based on altitude appear to be based on whatever SurfaceMFD is showing instead of the actual altitude from the lunar surface (OrbiterSound has the same problem too). I'm trying to trigger callouts & lunar dust being kicked up from the LEM descent engine based on altitude.
VB uses simply the oapi function GetAltitude() but it returns altitude above mean radius. I need to find a way to add a parameter in order to let the user set the reference (mean radius or actual ground).
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Old 10-14-2019, 02:04 AM   #63
Kyle
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Thanks Fred! Re: Saturn IB I don't think it's something wrong with MS2015 because the Saturn V/CSM/LEM combo works perfectly. It might be something wrong with the publicly available figures.
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Old 10-14-2019, 10:42 AM   #64
4throck
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Thanks for the help!

I've checked complex mode and perturbations settings on Orbiter, and they do have an impact. Specially since the LEM is also running out of fuel 5 seconds before landing.

Do you guys have those options activated on Orbiter? I can't remember what's Orbiter default...
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Old 10-15-2019, 10:32 PM   #65
4throck
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Adding lights to the CSM and playing with with reflections.
Next step is parachutes... never did that on VesselBuilder, let's see how it goes!
Attached Thumbnails
csm.png  
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Old 10-16-2019, 12:15 AM   #66
Kyle
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Originally Posted by 4throck View Post
 Thanks for the help!

I've checked complex mode and perturbations settings on Orbiter, and they do have an impact. Specially since the LEM is also running out of fuel 5 seconds before landing.

Do you guys have those options activated on Orbiter? I can't remember what's Orbiter default...
I don't but that would make sense. I'll give it a run.
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Old 10-16-2019, 08:53 AM   #67
4throck
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From my tests turning those parameters off is not enough for the Saturn Ib to work by the numbers.

So I've settled into using the parameters from 2010 Multistage Saturn Ib. The "by the numbers" figures are commented:

Code:
[STAGE_1]
Height=24.48
Diameter=6.52
EmptyMass=41594  ;38878
FuelMass=407084 ;411953
Thrust=8241630 ;7117155
BurnTime=143 ;150
.....

Code:
[STAGE_2]
Height=17.8
Diameter=6.61
EmptyMass=12900 ;12495
FuelMass=105900 ;105795
Thrust=1031600 ;924349 
BurnTime=475 ;480
......
Interstage, LES, and fairing have their real weights.
I can get into orbit with about 5% of fuel to spare, under 10x acceleration.
That's good enough for me, and we have some margin for a heavier CSM.


Will update the ZIP when possible
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