Hi Paul,

    you think ? As you can see the ring is retained by four roll pins,
    is this a good idea ?

    cheers Chris Hoskins.

    The role pins are a good idea. They act like 3 keyways. At that
    radius the load is low. This was back in the days when people were
    lucky to get 150 HP.

    Paul Lamar

    Hi Paul, how do 4 roll pins act like 3 keyways? I think the 6 or 8
    tapped short screws around the peripheral are a much better idea,
    especially when the ring gear is a snug fit in the housing. Dave
    Mccandless in Perth


    Sorry Dave! 4 keyways.  I had been working my butt off getting this
    RX8 water block so the machinist is happy :-) The weight is down to
    .65 pound.

    True the extended point set screws would work good as well. This Ross
    design is 47 years old. Long before  the extended point set screw was
    invented.


    Paul Lamar

    Paul, Does that indicate you have enough interested customers to
    build a batch of the RX8 water block ??................

    Kelly Troyer


    Well I think so. The problem we are running into (I think) is the
    lack of 5 axis NC mill software and the skill of the 5 axis NC mill
    operator (I think :-))

    This is a tough job.

    Paul Lamar


    Plugs up orientation [is]  the best fit for the Q2 airframe. It
    points the exhaust down, and allows for a higher thrust line without
    poking the crank angle sensor out the top of the cowl. The Q2 has
    limited ground clearance, and the large gear reduction begs for a
    longer prop. I went with a 62 inch long, 95 in pitch two blade. Even
    with that, I had a minor prop strike when the wheel ripped off the
    wing.  The engine kept running, but I suspect it helped loosen the
    bolts in the planet carrier. Ground loop caused by a stuck brake.

    Sold the plane because it was six years too long in construction and
    over budget. I simply had enough. Currently designing a twin engine
    rotary, but have a big project ahead of it in the pipeline. Lewis
    Bjork.

    A few comments on plugs up. The old crank angle sensor is not really
    needed anymore and if you decide on plugs up you should be using a
    dry sump oil system.

    Paul Lamar

    Hi Lewis, Thanks for the little bit of history on the motor Lewis,
    very helpful, sorry to hear about your misfortune. Cheers Chris
    Hoskins.


   Hey Lewis,

   There's a recent Kitplanes (I think it was Kitplanes) article featuring a Q2 that looks identical to yours with a custom trailer set-up (which is what the article is about), is that yours? I was in a hurry just flipping through mag before I had to dash..

   Dan Gorsline

Yup. I occasionally write for kitplanes.
An Unfortunate end to an interesting project. One more article to go, "The demise of the cosmic fish."  Detailing the obnoxious end of a frustrating endeavor.
With experimental airplanes, sometimes it doesn't go as well as we hope. Nevertheless, it pays to make the journey.
Lewis Bjork.

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