OHM CYGNSS

[OrbitHangar]

Author: brianj

NASA's CYGNSS (Cyclone Global Navigation Satellite System) satellite constellation.

Eight satellites carried to orbit by PegasusXL, air-launched from L-1011 "Stargazer" 

Add-on inc. CYGNSS satellites and Deployment Module, recompiled .dll modules for L-1011 Stargazer and PegasusXL, launch scenario for 15 Dec.2016. Installation and operation notes in Doc/CYGNSS/cygnss_readme.txt.

 

REQUIREMENTS

Kev33 & Kwan3217's "Stargazer and PegasusXL"
http: //www.orbithangar.com/searchid.php?ID=2826

Big thanks to Kev33 and Kwan3217 !

Update 161128: Better aerodynamics for L-1011

Update 170112: Scenario date and runway location, Pegasus fuel added, etc.



DOWNLOAD

 

[romanasul]

Thanks Brian!

 

[boogabooga]

The Stargazer takeoff speed of 120m/s = 230 knots.

Is it me, or are airfoils less effective in Orbiter 2016 compared to previously?

 

[Star Voyager]

Is it me, or CYGNSS look like a KH-9 subsat?

 

[IronRain]

Thanks Brian!
Awesome as always!

 

[BrianJ]

Hi,
I always enjoy a PegasusXL launch, and it's a nice dawn take-off for this one The way they plan on using atmospheric drag to control orbital position of the satellites is interesting, also.

The Stargazer takeoff speed of 120m/s = 230 knots.

Is it me, or are airfoils less effective in Orbiter 2016 compared to previously?

I had to tweak the "Stargazer" aerodynamics a bit to get it to fly. Take-off speed is too high (as you say), although thrust and mass should be about right. Increasing the lift makes take-off speed lower but normal flight becomes "floaty" (can't think of a better word). Flaps do give extra lift but also a lot of drag, so better for landing than take-off. Interesting to note that you can just go screaming along the ground at 200m/s, lift exceeds weight but no take-off until you pull back full on the elevators. I'm not great at aerodynamics, so maybe someone can do it better(code is included in .zip).
Cheers,
Brian

---------- Post added at 05:00 PM ---------- Previous post was at 11:08 AM ----------

Interesting to note that you can just go screaming along the ground at 200m/s, lift exceeds weight but no take-off until you pull back full on the elevators

Hmm, ok, it doesn't do this anymore. Then again, I have changed quite a bit of stuff since I saw the behaviour described above.

 

[jgrillo2002]

Are you going to make a orbiter 20010 version of this?

 

[BrianJ]

Are you going to make a orbiter 20010 version of this?

Hi,
I wasn't planning to, but attached is a .zip with a patch for Orbiter2010, you will also need to install "Iris" add-on [ame="http://www.orbithangar.com/searchid.php?ID=6178"]IRIS[/ame]

So required add-ons are:
CYGNSS
CYGNSS patch for O2010
Stargazer and PegasusXL
Iris

Cheers
Brian

 

[jgrillo2002]

Hi,
I wasn't planning to, but attached is a .zip with a patch for Orbiter2010, you will also need to install "Iris" add-on IRIS

So required add-ons are:
CYGNSS
CYGNSS patch for O2010
Stargazer and PegasusXL
Iris

Cheers
Brian

Nice. Thanks

 

[Interceptor]

Thanks Brian this is a great.

 

[BrianJ]

Updated on OH - new aerodynamics for L-1011, variable Flaps, can now takeoff at 80m/s.
I reduced the distance to the rear-wheel touchdown points, which reduced the turning moment due to weight, enabling the the elevator to pull the nose up at 80m/s. Hope it handles better.

 

[boogabooga]

Quick check to make sure that the reported wind speed and direction are coming directly from Orbiter 2016 core and not being affected by this add-on.

I was initially a bit shocked to see the wind reaching 20-30 m/s (40 to 60 knots) at altitude, but then I did some reading. I never realized that this is actually a fairly moderate and realistic value for winds aloft. Flying at high altitude (10-12km) is often like flying through a hurricane, wind-wise. :blink:

---------- Post added at 07:49 AM ---------- Previous post was at 12:40 AM ----------

Also, tiny issue, but it seems that the real mission orbit is about 320 x 320 miles, not km.

 

[K_Jameson]

I'm always amazed at how BrianJ finds the time, the resources, the ability and the motivation to publish in real-time this endless list of realistic addons.

Brian, I really think that your day is 48-72 hours long!

 

[BrianJ]

I'm always amazed at how BrianJ finds the time, the resources, the ability and the motivation to publish in real-time this endless list of realistic addons.

Brian, I really think that your day is 48-72 hours long!

Far too much time spent in Orbit. I should pay more attention to making money ;-)

Also, tiny issue, but it seems that the real mission orbit is about 320 x 320 miles, not km.

Doh! I think I got the wrong runway at KSC too. Need to do another update.

 

[boogabooga]

I tried to target 514 x 514 km by hand, but Pegasus can't quite make it.

Also, is the wind dir. reporting the direction the wind is blowing to or blowing from? I suspect the former but the later is more conventional.

 

[BrianJ]

Update 170112 on OH:
Changed launch scenario date, more fuel aboard PegasusXL and autopilot set for 520km orbit alt. Stargazer Wind Direction now shows wind origin, take off runway switched to CCAFS.