Paul, there was a question a few days ago about vertical mounting of
     the rotary, for helicopters.

     Of course all rotors must be able to drain, and a single-rotor
     engine will probably be OK for vertical if the gearing is at the top.
     The Mazda 2-rotor with its "handed" arrangement will allow the upper
     rotor to drain but the lower one ends up clogged. But Larry Childs'
     one looks like it could support vertical operation if gears were all
     facing the same way.

     How has he arranged it?  All facing same direction (identical
     plates), or as two two-rotor sets ( two drainage plates and one
     central plate with gears both sides)

     BTW, there have been other engines with "tunnel" non-split cases -
     here are some https://www.google.com/patents/US2698609
     http://sp9010.ncry.org/photos/mb007.jpg
     http://russianpatents.com/patent/206/2064101.html

     Thanks Paul Randall

     Facing the gears one way for vertical mount is a good idea. Nothing
     that definitive yet.

     Paul Lamar


     Paul, Drains could be built into the stationary gear flange and
     allow vertical mount with gears from each direction.

    Larry Childs

    Sounds good.

    I think I will inherit the damaged TTC turbo charger which
    will work for testing on the 4 rotor.
    I also have a new avaid dry sump pump we can use for the
    prototype 4 rotor.

    I'll deliver some day along with the Allison planet.


    Paul Lamar

Paul, group,
One of the good things that Curtis-Wright did was a nice inter-rotor bearing system. I don't believe that they have maintained the patent. Their system would allow as many rotors as you want with a solid e-shaft. I believe you could build a four rotor about the same length as the current 3 rotor. I have attached the photo and the patent drawing. I believe the photo was on the website in the past.
Bill Jepson

Yes I took the picture at Hayes Rotary engineering.
Hayes was tasked with rebuilding it. It is a rare
animal indeed. There is one in the P&W museum and one
in the Smithsonian and that one as far as I know.

I am not sure it would work in a 4 rotor.

Paul Lamar

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