Nacon

At first, my goal was to build the longest rocket and get it out of orbit range. Using two small solid boosters on each large fuel tank to support its weight at the start of lift off. There's a decoupler on the bottom of the main liquid booster to keep rocket's weight from crunching and damaging the booster. It comes right off at first stage. After all of the small boosters run out, the rocket has enough velocity and height to fire its main liquid booster to carry the weight as gravity grew thin. (Will update later with a picture.) Penumbera Rocket can reach over 100Km before all of the fuels from 8 large fuel tanks runs out with 2900Kmps velocity. However, I came up with a trick to squeeze out another velocity before switching to my final stage. Using centrifugal force from Pod and Yawmaster-2000 RCS. Penumbera would spin so fast that G-force for the pilots had maxed out the meter. Then it was time to activate the last staging decoupler and fire away the last remaining fuel.

Just made the longest stable rocket before those large fuel tank was more durable. 8 of them stacked together with two small solid booster on each to thrust-support its weight as a starting point at lift off. Once all of those small boosters ran out, the rocket got enough velocity to fly out with its own main liquid booster; as gravity grew thin from that point than starting from the ground. Since now those fuel tank are more durable, I can add more. > In case you're wondering, I put a decoupler on the bottom to keep rocket's weight from crunching and damaging the main booster. It comes off at first stage when all of the small boosters goes off.

Sorry, it's not a rocket, it's a bomb. It explodes soon as it launch. Too much force pushing against the units on the top.

I've registered this forum to say (little) SPS-10 liquid engine has some bugs where it doesn't fire as should. I've checked my Flight events log and it doesn't register any sort of failure nor damage. It has FL-R25 Fuel Tank attached on top and TR-18A Stack Decouple attached on the bottom of SPS-10 liquid engine.