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RAZBAM: T-2 Buckeye

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  • Author
  • Commercial Member
Monday update:
 

 

Time for the Monday morning update!
 
After integrating the AVL data tables I found that they were only valid and useful for very small alpha/beta. What I was able to gleam from it was some very solid dynamic derivatives so it wasn't all a waste.
 
I then went back and restructued the code to use what's called element theory, strip theory, whatever you wanna call it, but it breaks up the airplane into a bunch of pieces you can evaluate indivudually. This is turning out great given the detailed geometry I have.
 
I have a video posted but am holding off giving out the link till I get the thumbs up from Ron to show you guys how it looks so far! I do have to say, that this aircraft is extremely forgiving to fly (I guess why it works so well as a trainer)

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  • Author
  • Commercial Member
more internal cockpit work on T-2 Buckeye
 
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new T-2 AFM and 6DOF cockpit test (no the preview cockpit images)

 

First full 6DOF flight of the T-2 Buckeye in DCS with the AFM (Advanced Flight Model)

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  • 2 weeks later...
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  • Commercial Member

 

T-2 DCS Update.
 
Mapping continues, hating life. Texture work started with the base colors and warning labels being done. Still have far to go with the harness, and parachute mesh.
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Happy Forth of July.
 
Here is a quick WIP of the mapping of the pit, and a base placeholder texture being set.
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T-2 Buckeye DCS Initial Cockpit to Flight Model Interaction

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W-O-W!!! Beautiful,Gear Gauge Indicator is Stunning!!! Very Nice Work.

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Patrick

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  • Commercial Member
New cockpit pic

 

Thanks everyone, 
 
I am starting to label the console panels. One more quick flat print screen from the view port.
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T-2 Buckeye DCS First Collsion Model, Gear System, and Flaps Testing

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Here is what got knocked out:
- Blended in the existing airfoil data tables with the very low/high alpha tables
- Added in variable dynamic derivatives
 
Both those above allow for nice stalls and I even got into some spins, need to read up on proper spin entry procedures for this guy and I'll compare and if it looks good, I'll have a video of that out.
 
Also, 
Got the gear into a decent state, needed to use the A-10 collision model until ours gets tweaked just a tad. With all of those combined, and a ton of other tweaking, I'm able to test out how this guy behaves per proper takeoff/approach procedures.
 
Here is a fun example:
For my weight approach speed should be ~100 knots, angle of attack 15 degrees. My approach was 15 alpha but to be trimmed out I had to be a 115 knots so still a little work to do on it, but it is certainly getting there!
 
Also, the gear modeling needs much work, it still has sissy USAF style gear strength as seen in the video.
 
 
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  • 2 weeks later...
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Hey all, here's a new video showing some of the gradual modeling improvements. I annotated it a bit to show what I'm trying to do to make sure it matches approach instructions (and feels right while doing so).
 
Also, this is the initial version of the new cockpit integrated. Much better field of view with the Mk5 gunsight system out of the way on the dashboard! 
 
Again, please keep in mind this is still VERY MUCH a work in progress and everything is subject to change as usual. I have about 3 full pages of bulleted items to continue to work on so we aren't out of the woods yet.
 

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  • 1 month later...
  • Author
  • Commercial Member

 

Hey guys, long time no update!
 
I've been really wrapped up in my day job, but knew I needed to give you guys an update on what's going on:
 
Flying Qualities/Dynamics/Performance:
I feel pretty good with the flying qualities, I'll try to generate some performance/data charts as some comparisons. In general the aircraft operates in the appropriate envelopes and it's fun to see the same behavior of the aircraft as seen in youtube videos, but the proof is in the numbers so I'll try to get that out to you guys soon.
 
Engine and Fuel Systems:
In general, steady state performance is golden, it's using a really cool physics based model based off NASA/DOD real time simulation block diagrams for similar engines of that generation then modified for the specific J85 we are going for. Again, I'd like to show some neat data charts for engine performance comparison.
 
For engine dynamics, it also models a very convincing fuel governor, which I consider the most important part of the engine model since it uses various cams, valves, etc.. to control the fuel going into the engine based off a few parameters. 
 
For engine startup/shutdown, I'm still working on getting it right. It'd be easier if this were a parametric model, but it's physics based so it's tough to get the right dynamic behavior, will keep you guys updated on the progress.
 
That's all for now!

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  • 1 month later...
  • Author
  • Commercial Member
T-2 Update:
 

 

Update
 
Working on the T-2 for DCS, Ron and myself are focusing on the exterior model.
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  • Author
  • Commercial Member
RAZBAM T-2 Update
 

 

Another quick update for you guys.
 
Engine Model - Looking really good and happy with it so far but definitely needs a more detailed evaluation. I've got engine startup and shutdown logic implemented and also pretty satisfied with how it looks so far. The engine model probably has more complexity in the modeling than the aero model. Simple fuel model coded up and more fidelity is being added to it this week.
 
I'm really excited about the engine model and how it can be quickly modified to fit any turbine type engine with minor modification (turboshaft, turbofan, etc..). If you guys want any more details on how it works I'd be happy to do a small write-up.
 
Flight Model - Not a whole ton of changes, working to add in dynamics of the actuators based on hydraulic pressure and electrical power status.
 
Landing Gear Model - More improvements made, looking better each day
 
Cockpit/Systems Integration - I have a ton of new stuff unit tested and integrated into the cockpit code (sensors, controls, indicators, etc...) once we have an updated cockpit model with more of the needles and switches animated we should have some cool stuff to show.
 
It's definitely coming together, the next major tasking for the upcoming weeks is the fuel, hydraulics, and electrical models and continuing cockpit integration alongside that. 
 
I know the other guys are hard at work on upgrading the cockpit model and making a completely new external model so a ton of new things coming along!

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  • 3 weeks later...
  • Author
  • Commercial Member
T-2 Update
 

 

ok I have been givin permission to post this very early WIP video of the T-2 Buckeye Audios ingame.
 
all authentic engine audios.
 
video below.. enjoy all.
 

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  • Author
  • Commercial Member
T-2 Update. AFM test
 

We have been busy. Here is a video of the latest test of the AFM

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  • 4 months later...
  • Author
  • Commercial Member
T-2 Update
 

 

Hey all, since the T-2 updates have slowed a bit, I figured that would justify more detailed updates within their own separate thread to keep updates more organized. so here goes...
 
I'm just the flight model and system coder so no new eye candy, unfortunately all my stuff is under the hood. 
 
1. Now that we have branched into multiple projects at a time, I am reworking the entire code structure to be even more modular than before. I did a little bit of this before but I'm breaking everything up even further so that common code elements can be dropped in across airframe models relatively easily. This is taking a bit of time but hopefully will save time in the long run
 
2. Matured some of the systems models to include engine, hydraulics, and landing gear. The code structure has been developed for the electrical system and I hope to try integrating some of the example radio code to try that out as well. I also hope to improve the weapons coding a bit. I'm also making small tweaks and improvements as I learn more about the SDK.
 
3. The flight model is pretty solidified. Once I get the engine model a little better I can start doing performance comparisons to the spec. I've done very minor spot tests and they look really good.
 
I know many of you were under the assumption that because other projects were being worked on, that the T-2 is completely dropped but that is not the case at all!
 
Back to work

Only a community member with intent maintain informed to the simulator community about DCS: World news and progress

 

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Disclaimer: I´m not member of DCS: World team, Eagle Dynamic team or None official 3rd party.

Great to know,Thank You for info.

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Patrick

Great videos demonstrating the level of working going into this project. I enjoy the T-2 in FSX and look forward to seeing it for  DCS World.

Keith Guillory

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