Jim Mederer used a interesting technique to tune the turbo for
    aircraft use. Most turbos are designed for automotive use where
    fast spool up is necessary. The probelm with this is at high
    continuous aircraft power the turbine will over heat and or over
    speed and fail.

    What Jim did was use a controlled leak in the exhaust manifold to
    get just enough boost.

    Works better than a waste gate with low A/R turbos.

    This has a side benefit of reducing the exhaust back pressure.
    Less back pressure more power.

    Paul Lamar

    Hi Paul. I don’t understand! I thought a waist gate was a
    controlled leak in the exhaust manifold.

    Steve Izett

    Yes it is but it is a bit heavy and problematic. This  is much
    simpler and and lighter weight.

    The waste gate only measures the manifold pressure. This device responds
    to the ratio of back pressure to atmospheric pressure. I think it
    does a better job of keeping the HP matched to the altitude
    change.

    Of course the jury is still out until we fly it.


    Paul Lamar


    Paul, What you should do is to use the largest turbine housing
    possible. An AR of 1.44 would be about right. Boost response for a
    car would be terrible but for an aircraft it would be perfect. GM
    did this with the Corvair Turbo... no wastegate, just a large
    oversized turbine housing. Barry Bordes


    Sounds right to me. That is a large A over R. Those are rare and
    expensive as far as I can tell.

    Paul Lamar

   Where is this test to Climb being conducted?


   Chuck Linden

   Testing the engine will be done at SZP

   For the actual attempt and perhaps a few test flights
   we are considering Bermuda Dunes. Same place Daryl Greenameyer
   chose for the same reasons  for Rare Bear.

   Jim Mederer suggested a few changes to our turbo charger plumbing
   so it will take me about a week to fix that. Mostly changing all the AN
   lines to solid steel for heat reasons.

   Paul


   Paul,
     What is A/R ratio of the "TTC" turbine housing ??

   Kelly Troyer


I don't know. I think it is in the automotive range.

Paul Lamar

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