-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

Doug Mueller 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
do you think that you could pass that approach off on him?
Doug Mueller
RV-6 13BT
N900DM

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