From: al p wick <alwick@juno.com <mailto:alwick@juno.com>>
> Date: 2005/06/01 Wed PM 05:53:06 EDT
> To: Cozy_Builders@mailman.qth.net <mailto:Cozy_Builders@mailman.qth.net>
> Subject: COZY: Rotary risks
>
> I'm part way thru measuring Rotary risks. Using Tracy's newsletters as
> basis (what a neat guy). One thing is abundantly clear, it is a very high
> risk install. Substantially higher than the Lycoming. I know this is
> going to upset a lot of people. I don't want to remain silent when I have
> facts that may save a life.
> Each change you make to a system increases your risk. Tons of changes.
> Marginal cooling of oil and water 6+ years later. Having to watch
> something is a root cause of pilot oversight.
> High shut down risk of his EFI system(too bad, as his EFI could be a huge
> risk reduction if designed differently).
> Repeat root cause failures to design changes... the same pattern to all
> the failures.
>
> Doesn't mean don't use rotary, Perry had much lower risk as he didn't
> modify all those systems. It means, if you go that route, you better make
> sure you use every skill you can muster to anticipate failures and
> qualify each change while on the ground.
>
> I'll itemize the risk items in future, too many pans in fire right now. I
> also have to look at other info sources.
>
> Risk is not measured by how many moving components you have. That is
> propaganda. As are terms like "hand grenade" and "melting aluminum". It's
> the total system that counts.
>
> Fire away!
>
> -al wick
> Artificial intelligence in cockpit, Cozy IV powered by stock Subaru 2.5
> N9032U 200+ hours on engine/airframe from Portland, Oregon
> Prop construct, Subaru install, Risk assessment, Glass panel design info:
> http://www.maddyhome.com/canardpages/pages/alwick/index.html

Paul Lamar wrote:
What sources of data are you using for your risk assessment?

Paul Lamar

Tracy newsletters. Excellent source, as the guy is so forthright.

-al

Paul Lamar wrote:
I did not know he was still publishing them. What is the last issue
you received?

How does one go about assessing the risk?

Paul Lamar

FMEA is the best way. You can read about the method on my web page. Hope
I'm not being unfair, but I get the impression that you are heavily
influenced by your emotions. You might have a difficult time seeing any
merit to the process.

-al wick

Notice he did not answer both questions. Tracy published the last newsletter
in the year 2000.

BTW Good way to impress your potential customers is to first insult them :)

Paul Lamar

Al, I read on your website that you had cooling problems with your NACA
duct fed cooling system.

Do you still take off with your water temp at 212 - 217°F after a long taxi?

Regards,
Mark