REFLECTOR: After two years of prep.

[Peter Braswell]

David,
Thanks so much for sharing your story.  I guess misery loves company because
now I don't feel so bad having ruined my canard.

Peter

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On Wed, Aug 3, 2011 at 9:14 AM, David Ullman <ullman at robustdecisions.com>wrote:

> My Velocity will be done on Tuesday.  That is my response to the
> "question".
> I have been saying it for about five years.
>
> My latest setback came on engine first start last month which resulted in
> me
> tearing the engine down again (I built it up the first time from a timed
> out
> engine,  with adult supervision)  I broke it because I didn't have a
> "Sniffle Valve".  No, I didnt make that up!
>
> Its what you don't know that can hurt you and there is a lot I still don't
> know about Lycoming engines and Velocity airplanes.  This is true even
> though I have a PhD in Mechanical Engineering and a Masters in aeronautics.
> My ignorance about airplanes and engines continues to amaze me.
>
> It seems that on fuel injected engines, it is fairly easy to pump too much
> fuel into the injectors.  In fact, if you leave on the electric fuel pump
> and have the mixture not pulled to the fuel shut off position, you can pump
> the entire tank into the engine. The fuel then flows through the open
> intake
> valves into the intake manifold and even into the throttle body or, if the
> intake valves are open, into the cylinder flushing out any oil in the
> bottom
> of the cylinder.  I did that and scared two cylinders.  I come to find out
> that in the bottom of the manifold is a pipe plug (at least there was on my
> engine) and this is where the Sniffle Valve goes.  It lets gas drip out,
> but
> closes as soon as there is manifold pressure below ambient.  No one told me
> this before and many pairs of competent eyes have looked at my work.
>
> I still fail to understand the crudity of the design work on the Lycoming.
> There is no way you can flood a car engine to the point of ruining it.
>
> Anyway, it is all back together and I will start it again this week.  Now I
> wonder if I left off the Fapodoodle or the Quarnitip or Framistanze or
> ....?
>
>
> David G. Ullman
> ullman at robustdecisions.com
> 541-754-3609
>
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