Thanks Ed; 
The below is one of the reasons for looking at a SC in the first place. Specifically on a missed approach and go-around, in a ticklish spot, the responsiveness of the SC vs. the time it takes a TC to spool up, might be an advantage. And, as I have been hearing, back pressure (from a turbo) kills HP in a rotary. Maybe I'm picking the nit a little hard here?? 
Greg 
 
<snip> There are certainly advantages to a supercharger in some applications - and 
> to a turbo in others. The immediate boost response of a roots type blower > is about the only reason they are the bedrock of the top end drag racers. > Unlike a turbo which needs some time to spool up, the roots type > superchargers produce boost much quicker. There are several types on > impellers designed to increase the efficiency of the root types blowers, > but I am not aware of any that approach the centrifugal impeller in > efficiency. 
> 
> 
> While the turbo uses the "free" exhaust flow energy, you do get back > pressure with the turbocharger that effects (decreases) engine power so > that has to be considered also. But, overall, its my understanding that > the turbo is a bit more efficient and also does not decrease crankshaft > power (at least not as much) as a supercharger. However, there may be > other reasons (like not having to have all that heated exhaust pipes > routing around to and from a turbocharger) as well as cost for using one > vs the other. 
> 
> Gee, its great to be back {:>) 
> 
> my 0.02 
> 
> Ed 
> 
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