1/62 scale scratch-built Vostok, on one D12-3 and four A10-PT motors. At the moment of ignition, the video slows to 1/2 actual speed. Note how the mini A10-PT motors kick the model off the pad, even before the central D12-3 comes up to full thrust. The 4 A10's pack quite a kick! I built this model from scratch, using Peter Alway's "Rockets of the World" for reference. My next R-7 variant is under construction now, a 1/40 Sputnik R-7 booster with 4 18mm motors in the core. This was a NOVAAR launch that I attended along with a couple of other NARHAMS folks.