I'm proud to bring you the SpaceX BFR with the Roadster final versions. I've been wanting to upload this for weeks, but I wanted to do so with a video.
DISCLAIMER: I know the actual name is Starship, but since this is based on the 2018 version I'll mantain BFR name and upload a Starship version once SpaceX unveils how it will be. "(2020)" makes reference to the Roadster 2020 that this carries.
I launch from a custom location in the sea, near ecuator and with the black side of the Starship looking East, thrust to 75%, slider 1 and 2 to -100% and direction lock looking up. If you use custom locations in the sea you need 20m or more of altitude from the ground. If you want to launch from ground have in mind that the interstage that connects the ship to the rocket might break.
This is a 1:1 replica of the SpaceX Starship (BFR) with working grid fins and reentry wings capable of pushing various tons of cargo into orbit. This version is ment to land a Tesla Roadster 2020 in Cylero. I took all measurements from the 2018 renders and the thrust from old Elon Musk talks (that's the closest I could get to Raptor thrust). Also tried to match Roadster motor torque (front wheels with 1/2 torque because it's said to have 2 rear and 1 front motor), battery capacity and weight based on online info.
Ship and crane based in 2017 renders.
Rocket based on 2018 renders.
AG 1: Grid fin deploy
AG 2: Reentry wings pitch control
AG 3: Cargo door/Roadster boost
AG 4: Crane
AG 5: External 1st stage motors
AG 9: Solar
AG 10: RCS (off by default)
Slider 1 controls grid fin angle of deployment (they control pitch and yaw by themselves, but only if the booster mantains its initial rotation) and crane extension. SPOILER extends with this slider too.
Slider 2 controls reentry wings mode (-100% for launch/land and 100% for reentry) and crane cable extension. Also Cargo bay opens with Slider 2, so when landed (-100%) the door opens.
Roll controls crane rotation.
GENERAL INFO
- Created On: Windows
- Game Version: 0.6.7.2
- Price: $203,033k
- Number of Parts: 626
- Dimensions: 143 m x 65 m x 248 m
PERFORMANCE
- Total Delta V: 2.1km/s
- Total Thrust: 80.2MN
- Engines: 38
- Wet Mass: 1.39E+7kg
- Dry Mass: -44,635,444kg
STAGES
| Stage | Engines | Delta V | Thrust | Burn | Mass |
|---|---|---|---|---|---|
| 1 | 31 | 2.1km/s | 65.6MN | 83s | 4.02E+6kg |
| 2 | 0 | 0m/s | 0N | 0s | 2.52E+6kg |
SPOTLIGHTS
- AnotherFireFox 5.3 years ago
Falls over and explodes when I try to launch
Yay thanks
@Jopro Sure :)
Can I please put it in my YouTube video i will shoutout this post and put it in the description
@Starmang10 Trial and error hahahahaha
@pedro16797 How did the Roadster In the video stood up?!
@PorkyClown3 Thanks :)
Wonderful design!
@AnotherFireFox it's just a laser surgery, the probability of something going wrong is almost inexistent, but I can't look at screens for 4 to 8 days :/
@pedro16797 Wow, hope your eye surgery go well! Okay, I also have a college final and such so I'm not sure I can release it before your recovery but I'll put that on my to-do list.
@AnotherFireFox this week i have college tests and next week I'll get an eye surgery. Since I have little time I'll play with small projects. I don't mind if you upload the RSS BFR as yours if you want, else It will take almost a month (in january I have some important tests)
If you want to upload it I can link to it in the video description if you want
@AnotherFireFox oh, capacity in xml is volume, so fuel density is 1.1
Nope, that is not too much. Rocket engines gulp fuels a lot, they consume hundreds or thousands liters per second. Can you give me a permission for your sheet? My Google account is technorcracy90@gmail.com
@AnotherFireFox I've seen all E-11 values in the xml file, make them all 0 (the last hour editing xml :D), opened the game and all 0s became something E-11 again
@pedro16797 Seems like your source defined Isp with mass, which is not normal. To get Isp in second, you have to define Isp with weight, which is already a force, so you don't have to consider g again.
@AnotherFireFox M is for methane. The SFC formula is like that in wikipedia, not the most trustful source, but the SFC' resoults seem legit
@pedro16797 I guess your Thrust(known) and ISP(known) are not matching. They should be in same ratio. SFC per second is 1/Isp, not 1/(Isp*g). --Is DensityM density of fuel mixture? because the number seems like density of deep cryogenic methane, so fuel itself, not mixture.-- Oops, M was for methane. Anyway tank density formula is not correct - I'm trying to understand why have you come with the formula.
@AnotherFireFox I've made a sheet with the calculations. I'm not sure if they're right. I've updated isp and thrust values to the last known.
@pedro16797 Here you are. See the first sheet. Look up Raptor in the name column. Thrust(N) is for thrust, In-Game Consumption(L/s) is for FeulConsumption value, SeaLevelEfficiency is for SeaLevelEfficiency. After setting the engine, you have to alter all fuel source's capacity and fuel with the value multiplied by Fuel Multiplier. This is because SR2 fuel is RP-1/LOX mixture which is far denser than Methane/LOX mixture Raptors use.
I'm glad this is out. The last 150h of gameplay were design, tweaking everything to look the best possible, testing and changing everything, dealing with bugs, repeating the mission more that 20 times from the start... I can finally play this game again
@AnotherFireFox if you send the sheet I'll make it realistic tomorrow, now I'll leave the final video rendering. Thanks a lot :)
1,993 kN
330 s, 380 s (vacuum)
Liquid oxygen / Liquid methane
Mixture ratio 3.81
I have to search tomorrow for Methane and Oxygen densities
@pedro16797 That's the tricky part. SR2 engines are configured with "Thrust" in newton and "FuelConsumption" in liter(m^3). You can calculate Isp by thrust and fuel consumption in mass, so you have to turn your fuel consumption mass into volume and put the value into "FuelConsumption" code. Moreover, you can't edit the fuel density itself, you have to use some trick: divide your fuel consumption volume by relative density and such to match mass fraction. This will give you funny Isp ingame but anyway you'll get correct dV with given fuel mass.
I've added a link with the preview in the description :)
@AnotherFireFox Uh, I'll love to do that. I tinkered with the xml a week ago for the first time, what's the name of the ISP variable in the xml? ISP?