I can, I have sat on the F1 Technical working group and its predecessor on and off since the late 70s. The rules have, for the last 20 years been politically and financially manipulated, it is a long time since they had a simple unambiguous technical objective, but that is a long and emotive story. To answer your questions: Turbines were banned simply to help prevent spiralling costs should they prove to be competitive (ie if a turbine engine was necessary to win and only 1 team had one it would ruin the racing until enough others has designed and built one). As it happens, study shows turbine engines to be unsuitable for racing cars for the obvious (to race engineers) reasons. Hybrid (as like Prius) was banned for performance reasons. The regenerative and assistance in acceleration modes would have made the cars much faster and nobody (on the political side) wanted that. I personally very much regret this, but then I have regretted almost every non-safety related rule change since the politically motivated fiddlers took over from the engineers and ruined the racing. Frank On 29 Jan, 2005, at 03:22, Ardeshir Mehta wrote: > Okay, then explain why hybrids and turbine-powered race cars have been > banned by the authorities who regulate Formula One!