What you are talking about if bifurcating the output of the 911 fan.
It would look just like the annular cans in my old turbine engines.
Looking from the rear, they would be split at 1 o'clock and 7 o'clock, with
the 1 and 6 o'clock tube feeding the 3/4 cyls and the 12 and 7 o'clock tube feeding the 1/2 side.
I have made up foam models to do this, as it is an excellent idea, but I
have no fiberglassing savvy.
Maybe a fiberglassing GURU close to me would like to take on the challenge
of taking my foam molds and making fiberglass molds to test and share the results?
OF course, since it would be the most beautiful and efficient design/use of
the 911C2 fans(12-blade), demand will be so great that one person couldn't
possibly spend all the cash he would make off of my idea/molds, so he would also share
some of the profits, eh? BUWAHAHAHAHAHAHAHAHAHAHAHA!
Interested Wally?
Don