Doh! I meant 15 km . I play stock when flying these. I tried this ascent but could only get stable at 35km. I dropped the tanks as soon as the oxi was dry. I landed with around 120 units of fuel left on the mun, but i could not get back to orbit. You might want to cover these kind of ascents in your next masterclass vid. I can record my entire flight if you want. Thanks