MechJeb2 in RSS/RO: Classic Ascent Versus PVG Ascent

[gilflo]

Hello all, I am playing Realism Overhaul KSP 1.12.3, using MechJeb2 for my rocket ascent. I built quite a Huge rocket - 2 Stages LqH/LqO - to set in orbit 400 kms my 225T charge.

I never succeed the ascent using PVG method, even after reading all about PVG ascent here: https://github.com/KSP-RO/RP-1/wiki/TroubleshootingMechJebPVG

I tried many classic ascent methods and send my charge in orbit with only 7527 DV Atm 9133 DV VAC with insertion behind Periapsis.

Here are the parameters:

Stage 1: 6 engines M1U-SL   3502 DV Atm 4208DV VAC TWR SLT 1.50

Stage 2 3 engines CobraH   4025 DV Atm 4925 DV VAC TWR 1.38

                      TTL DV         7527 DV Atmo   9133 DV VAC

Charge: Lunar station + Injector  225T (Engine AR 22)

TOW:  Launcher + charge 2615T Height 182m Diameter 9m Engines Base 10m

 

Orbit 400 kms  Gravity turn begins at 100m/s, Turn shape 37,5% -End turn 150kms at -4°

I do not understand why PVG can't perform this launch: I need more DV and it ends with more than 1000 kms apoapsis and low periapsis. I know it depends hardly on rocket parameters, but my rocket seems quite "standard" !

Edited March 2 by gilflo

[gilflo]

Ok I got the Dev MechJeb 2....when I get the "non Dev" build, PVG runs perfectly, but I do a little better with my classic ascent program...minus 100 to 200 DV !