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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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