I have made a few tweaks and updates to my Delta II replica in an effort to make it a more faithful reproduction. .
Change Log:
-GEM-46 SRMs are now the correct diameter. The new motors burn for 80s instead of 60s, just as GEM-46 motors should. (The Delta II used GEM-46 SRMs in its "Heavy" configuration. In my first model, I had inadvertently used the length of the GEM-46 and the diameter of the GEM-40.)
-Payload fairing length increased slightly.
-First Stage engine skirt updated.
-External fuel duct placement on the first stage.
-First stage interstage model updated.
As a result of these updates, I was also able to replicate the actual GEM-40 motors used on non-heavy Delta II's. I will post that model as well. Stay Tuned!
Spin Table Operation:
-The spin table is powered by a secondary RCS. To activate, press "8". Then press "E" to start spinning up the kick stage. After about 3 full seconds, the kick stage will have a sufficent RPM and can then be activated. NOTE: I reccomend switiching the main upper stage RCS to "OFF" before activating the spin table.
GENERAL INFO
- Predecessor: Delta II 7925H
- Successors 1 craft(s) +98 bonus
- Created On: Windows
- Game Version: 0.7.1.4
- Price: $8,262k
- Number of Parts: 260
- Dimensions: 55 m x 18 m x 18 m
PERFORMANCE
- Total Delta V: 7.7km/s
- Total Thrust: 3.9MN
- Engines: 14
- Wet Mass: 1.2E+6kg
- Dry Mass: 71,440kg
STAGES
| Stage | Engines | Delta V | Thrust | Burn | Mass |
|---|---|---|---|---|---|
| 1 | 3 | 134m/s | 1.1MN | 2.4m | 1.2E+6kg |
| 2 | 6 | 117m/s | 1.8MN | 75s | 1.2E+6kg |
| 4 | 3 | 374m/s | 872kN | 80s | 2.03E+5kg |
| 9 | 1 | 5.8km/s | 31kN | 5.4m | 4,210kg |
| 11 | 1 | 1.2km/s | 85kN | 40s | 3,655kg |
9 Comments
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0 Samps0n1.2 years ago
The work you did on that spin up design with the slip plate that lets the satellite not take the centrifugal forces that the stability requires is great. Even rcs’s to do that work in both sides of the slip plate. Now is that what the elec engine does? Is it on free spin mode or do you use it to control on of the spin processes? I thought I ask instead of looking at kid footage. Is the sequence where the last three srb ignite then the delta drops 2 sets of 3 srb, in that order? I assumed the drops would occur first but your attention to detail is incredible and I would likely tend to hold your ‘models’ as close to the real thing.
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443 AscendingNike+1 4.9 years ago
@MarioG Sounds like a good approach. Cant wait to see your final product!
And yes! Delta II V-2 will be a must if you're making both engines for it! I'll probably try to make an actual launch pad replica at that point as well. The current one is quite lacking!
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45.4k MarioG+1 4.9 years ago
@AscendingNike my main focus is stats first asthetics second although i plan on use xml to get the asthetics i want. Btw im making the RS-27A aswell, Delta II V-2?
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443 AscendingNike+1 4.9 years ago
@MarioG Absolutely! I know there are at least two main issues with my model. The first being that the 4 spherical pressure tanks are about a fifth of the actual size, and the second being that the combustion chamber and nozzle throat are too big.
The colors should be pretty spot on. I was able to color match them on my phone from a reference picture, extract the hexadecimal code, and use that in the editor. If you want the colors I can post them in a comment for ya!
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45.4k MarioG4.9 years ago
Hey could i use a bit of you AJ-10 model for a engine pack i have? Ill give you credit if i do
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@Samps0n thanks for the kind words! I had fun making this one!
Yes, the electric motor is just used as a free-spinning bearing! The RCS on the spin table is what brings the satellite up to the proper RPM.
Regarding the SRB sequencing: There are three air-start SRBs that have vacuum optimized nozzles. They light about 15 seconds before the ground-start SRBs burn out. The real Delta holds on to the ground-start SRBs a little after burnout before staging them, I believe that is done to ensure that the SRBs land in the intended splash zone in the ocean!
If you like this Delta model, I also created a pack of a few other common Delta II variants. Feel free to check those out as well!