its just a simple mod...you could probably get it to go faster by adding smaller fuel tanks...(i wanted to fool you lol) and/or more engines...the ship is unstable thought unless controlled it spins so fast it blows up and dont launch with full throttle...the engine will blow up...my top speed with that engine is 300,000m/s and you can do that in about 78000M(the one distance above km) i will try to upload it...