mafish

Best results I got from this particular design was when I pitched up 10-15 degrees over velocity vector with "Surface" reference frame. It lets me push AP to ~230km and burn through all the fuel, but was really inefficient, leaving me with no fuel when I needed about 800dV to circularize. On the 1st stage, I've used upscaled MainSail (with the TweakScale mod, to keep things simple), it gave me close-enough dV and TWR to the excel sheet I posted before, and for the second stage I've used standard Poodle, it kept stats pretty close to the sheet and was the simplest solution. Guess I will watch couple of launches yet again, this time doing some on altitude and velocity, and then maybe cheat-edit the Poodle to achieve 1.0 TWR Thank you for your suggestions, Cheers

Hello everyone! Recently I've been messing around with HalfRSS mod (best decision ever!) and, of course, tried to recreate Flacon 9, both 1st and 2nd stage.I've found this sheethttps://docs.google.com/spreadsheets/d/1X9FUdHnowboCrjoWKpTM5OtLEqj26UWhF0UbEnON5_Q/edit?f=true&noheader=true&gid=18#gid=27 With pretty reasonable info about falcons parameters. I've scaled them down to be suitable, for HRSS, taking total delta-V as my base. Parameter | Falcon 9 | HRSS | Mine Total dV | 9380 | ~7200 | 7038 1st st dV | 3076 | ~2371 | 2369 2nd st dV | 6388 | ~4925 | 4669 With all this, i struggle to reach orbit. it seems that my 2nd stage has not nearly enough TWR to push craft to orbit. separation occurs somewhere between 40 - 50 km high (AP at 95-100km), and 2nd sdtage starts its burn right away. sadly no matter what pitch I set, 2nd stage doesn't even burn through half of its dV, until it falls back to atmosphere. What might be the reason for this? Is Falcon9 data I based inaccurate? or its HRRS fault (longer to reach AP in RSS than in HRSS?), or maybe my gravity turn is made badly? Cheers