I'm old too, but I don't remember the rocket cars being that fast or them losing drivers and having speed controling incidents. They have never acheived what FC and TF cars have.Just a thought here. I am old enough to remember when the jet and rocket cars were killing a bunch of guys. A speed limit was imposed. Instead of giving the crew chiefs an obstacle to overcome like taking away fuel,compression boost etc. Set a speed limit at 300 m.p.h. Break the speed limit...You lose. Simple as that! Then crew chiefs will use all that brain power in the desired direction??
I think you may be getting confused with the rocket powered G-Karts that were popular in the 60-70's that I think there were 6 or more drivers killed.