Orbiter-Forum [Project] Rockot launcher
 User Name Remember Me? Password
 Register Blogs Orbinauts List Social Groups FAQ Projects Mark Forums Read

 Addon Development Developers post news, updates, & discussions here about your projects in development.

 02-01-2011, 09:07 PM #46 IronRain Moderator Quote: Originally Posted by Wishbone  IronRain, take care and the fastest recovery to you! Thanks I have a question.. well, actually I wanna know if I'm right. The specs of the first are: Gross mass: 77,150 kg (170,080 lb). Unfuelled mass: 5,695 kg (12,555 lb). Height: 17.20 m (56.40 ft). Diameter: 2.50 m (8.20 ft). Span: 2.50 m (8.20 ft). Thrust: 1,778.66 kN (399,859 lbf). Specific impulse: 310 s. Specific impulse sea level: 285 s. Burn time: 121 s. Number: 178 . which I translated to: MESHNAME="Rockot\stage1" OFF=(0,0,0) HEIGHT=17.2 DIAMETER=2.5 THRUST=1778660 EMPTYMASS=5695 FUELMASS=71455 BURNTIME=121 SPEED=(0,0,-2) ENG_1=(0.8,0,-8.3) ENG_2=(-0.8,0,-8.3) ENG_3=(0,-0.7,-8.3) ENG_4=(0,0.7,-8.3) ENG_DIAMETER=0.8 ENG_TEX=Exhaust2 Well, most things are right, but I'm not sure about the masses and thrust values. Are these correct?
 02-01-2011, 09:19 PM #47 Urwumpe Certain Super User If you want me to be terribly correct: You should increase the empty mass a tiny bit for accounting for residual fuels and fuel trapped inside the wet engines. I just checked the fuel consumption, the fuel mass would be enough for 122 seconds, one second of operation more, so you should add 584.87 kg to the empty stage mass as residuals. Then the specific impulse should be right on target and the sea level thrust could be made accurate. Which you don't include yet, since you have no specific impulse lines yet. Last edited by Urwumpe; 02-01-2011 at 09:23 PM.
 Thanked by:
 02-01-2011, 09:34 PM #48 IronRain Moderator Quote: Originally Posted by Urwumpe  If you want me to be terribly correct: You should increase the empty mass a tiny bit for accounting for residual fuels and fuel trapped inside the wet engines. I just checked the fuel consumption, the fuel mass would be enough for 122 seconds, one second of operation more, so you should add 584.87 kg to the empty stage mass as residuals. Then the specific impulse should be right on target and the sea level thrust could be made accurate. Which you don't include yet, since you have no specific impulse lines yet. Thanks, I got the info from Astronautix, but I've heared that it's not completely reliable.. Code: ```Main Engine RD-0233/RD-0234 Fuel N2O4 / UDMH Sea Level Thrust 1870 kN (each engine 470 kN) Vacuum Thrust 2070 kN (each engine 520 kN) Sea Level Specific impulse: 285 s Vacuum Specific impulse: 310 s Burn Time 121 s``` This is from the PDF. I've missed this table, so this is the first time I see it.. How should I implant the sea level specific impulse? Last edited by IronRain; 02-01-2011 at 09:38 PM.
 02-01-2011, 09:38 PM #49 N_Molson Addon Developer About the mass, here are the figures from Khrunichev, the builders themselves : http://www.khrunichev.ru/main.php?id=43&hl=rockot
 02-01-2011, 09:39 PM #50 Urwumpe Certain Super User Quote: Originally Posted by IronRain  Thanks, I've got the info from Astronautix, but I've heared that it's not completely reliable.. That is not entirely correct - Encyclopedia Astronautica is VERY accurate and reliable, and if it is not, you can let Mark Wade correct it. But Mark Wade is no spaceflight engineer, he edits the homepage from the view of a historian, squeezing the known data into a template that permits easy comparison and put developments in relation, but you need to remember what each value on the homepage really means, if you want to turn it into simulation model. Quote: Originally Posted by IronRain   Code: ```Main Engine RD-0233/RD-0234 Fuel N2O4 / UDMH Sea Level Thrust 1870 kN (each engine 470 kN) Vacuum Thrust 2070 kN (each engine 520 kN) Sea Level Specific impulse: 285 s Vacuum Specific impulse: 310 s Burn Time 121 s``` This is from the PDF. I've missed this table, so this is the first time I see it.. How should I implant the sea level specific pulse? There should be an option in Multistage to set the two ISP values, if there is not (I always do DLLs, not Multistage2 files), you should ignore me.
 Thanked by:
 02-01-2011, 09:49 PM #51 IronRain Moderator Quote: Originally Posted by Urwumpe  There should be an option in Multistage to set the two ISP values, if there is not (I always do DLLs, not Multistage2 files), you should ignore me. No, only for boosters, not for stages. Code: ```CURVE_i: (t,l) defines the booster thrust level versus time (t is for time in seconds , l is for thrust level in percent of maximum thrust). Thrust level is interpolated between specified times. The profile can contain a maximum of 10 points (i stands for 1, 2 .. up to 10). If no curve is defined then 100% thrust is applied all the time.``` I could consider the first stage as a booster.. When do you say it's an booster and when do you say it's a stage? Or is there no rule for this?
 02-01-2011, 09:58 PM #52 Urwumpe Certain Super User I think you confuse a few things. CURVE is for implementing thrust curves, like solid rocket boosters have. This function does not change the specific impulse.
 Thanked by:
 02-01-2011, 10:00 PM #53 IronRain Moderator man, that's noobish, I'm sorry Then it's not possible. Last edited by IronRain; 02-01-2011 at 10:05 PM.
 02-01-2011, 10:55 PM #54 thegrogen Orbinaut Quote: Originally Posted by Urwumpe  That is not entirely correct - Encyclopedia Astronautica is VERY accurate and reliable, and if it is not, you can let Mark Wade correct it. Some would disagree...
 03-06-2013, 08:19 PM #56 IronRain Moderator Quote: Originally Posted by Me  I'm going to try not to make this a project which will be abandoned in a couple of weeks/months, but I don't promise anything. So here we go for another round! ATM, I'm busy with meshing all the stages and other parts with the skills that I've learned since the beginning of this project (almost 3 years ago ). Before I post some new shots of the launcher, I would like to request some information. I'm looking for some specifications of the RD-0233 engine like the diameter en height. Some kind of diagram would also be appreciated. Of course I've searched the web, but maybe some of our Russian friends can provide me a bit more information Last edited by IronRain; 03-06-2013 at 08:26 PM.
 Thanked by:
 04-29-2018, 05:57 PM #57 IronRain Moderator Rockot launcher Here we go again! Meshing is almost done. Next step is (still) the hardest part; texturing. Once complete I'll begin working on the MS2015 files and try to get here off the ground. Last edited by IronRain; 04-29-2018 at 07:25 PM.
 Thanked by:

 Orbiter-Forum

 Tags launcher, rockot

 Posting Rules BB code is On Smilies are On [IMG] code is On HTML code is Off You may not post new threads You may not post replies You may not post attachments You may not edit your posts
 Forum Jump User Control Panel Private Messages Subscriptions Who's Online Search Forums Forums Home Orbiter-Forum.com     Announcements     Meets & Greets Orbiter Space Flight Simulator     Orbiter Web Forum         OFMM         Orbiter Forum Space Station         Simpit Forum     General Questions & Help     MFD Questions & Help     Hardware & Software Help     Tutorials & Challenges     Orbiter SDK     Orbiter Visualization Project     Orbiter Beta » Orbiter Project Orbiter Addons     OrbitHangar Addons & Comments     Addons     Addon Development     Addon Requests     Addon Support & Bugs         Addon Developer Forums             Project Apollo - NASSP     Orbiter Lua Scripting Far Side of the Moon     Spaceflight News     Math & Physics     Astronomy & the Night Sky     Backyard Rocketry     Brighton Lounge     International Forum

All times are GMT. The time now is 01:10 PM.

 Quick Links Need Help?