Based on pplace's original model, this variant of the Bell X-1, moves away from the non-traditional turbine and to four "rockets", each one staged as you advance the throttle. The throttle now incrementally fires 4 individual rockets at approximately 25, 50, 75 and 85 percent of throttle, adding thrust, smoke and sound as each new rocket fires.

Also trimmed it out to fly with more realistic wing loading.