Hello everyone, as a new member, I just wanted to comment on the Blurzz Rocket cars. They are an excellent value and anyone into rocketry will enjoy them as a fun diversion. We have successfully modified two cars for 18mm and 24mm motors. The wheels were changed to rubber and aluminum hubs from R/C tailwheels and new axles from 3/32 piano wire. The stock Blurzz cars run on a line of 90 ft. Our 24mm mod E-powered car runs on a line of 400 ft. The 3-sec burn of the Estes E propels the car from dead-stop to the end of 400 ft. in 4-seconds. I have pix and video if I can figure it out.