-Rotary RX-6 wrote:

Chrissi, I thought that you were after an A/R ratio in excess of 1.0. Isn't the A/R
ratio in most sports cars far less then 1.0 for acceleration purposes? Aviation
turbos I believe are around 1.3. Please correct me if im wrong. but the smaller the
ratio, the faster it will accelerate to increase velocity not volume. ????
This is such a great forum.

As I got it from Greg: "The .81 A/R keeps you out of the surge range and in the middle of the 55
map. A 1.0 A/R pushes you closer to the edge of the map than I'd like to see."

Since I'm a dummy in this area I am just following informed opinions. The industry experts
themselves if such exist won't help due to liability issues.
.... Chrissi

Rotary RX-6 wrote:

Chrissi, that is probably true, but keep in mind that surge is a byproduct of demand. In an aircraft
application, you are expecting steady state demand not a throttle jocky state.(ie going through the
gears) I believe that is why autos use blow off valves to help prevent surge. I might be mistaken but
is Greg looking at this from an aircraft aspect or knowledge from auto use? The best thing I could say
when approaching people that are concerned with liability of our rotary projects is . Just tell them
that you are going to be racing a rotary racer up Pikes Peak in Colorado Springs,CO. They usually will
lend you the info you need and it will apply as density altitude is changing all the way up the long
climb on the road! I dont know Gregs experience but does he have aviation experience?

 
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