REFLECTOR: Las Vegas accident

[Kevin Baker]

Found this from an old Reflector..
http://n44vf.velocityxl.com/articles/views/full/v27.pdf          (pdf page 4)

"...One of the major drawbacks to this installation is that the 
supercharger is running all the time and consumes about 25-30 
horsepower from the engine just to run the supercharger even though 
all the pressure is being dumped overboard so as not to damage the 
engine. This has resulted in about a 25% reduction in climb 
performance at sea level....."

The article then goes on to explain a couple of ways one may help to 
eliminate this problem. 1) boost engine at takeoff to compensate 
(using 32" MP instead of the cusomary 29" or 2) use an electric 
clutch like in an a/c unit <more on would require auto MP limiter to 
prevent overboosting... etc.

FWTW.
Kevin


At 01:11 AM 8/28/2008, Kevin Baker wrote:
>Found this....
>http://www.lycoming.textron.com/support/publications/service-bulletins/pdfs/SB369J.pdf
>
>Not sure if it's helpful.. but is information.
>Tragic accident.
>
>Kevin
>
>
>At 10:38 PM 8/27/2008, Brian Michalk wrote:
> >Not much more information that the original NTSB report.
> >
> >What does it mean to engage the supercharger?
> >
> >A supercharger is a positive displacement compressor.
> >Now, technically speaking a turbine (centrifugal) compressor powered via
> >belt or other non-exhaust type source is considered a supercharger.
> >However, most people understand that a "supercharger" is a positive
> >displacement device.
> >
> >This means that if the power source is removed from a supercharger
> >(broken belt, etc.), then it will be a restriction to airflow.
> >
> >So, for the first flights, was the supercharger bypassed?  It's amazing
> >to me that the first five hours were uneventful, then this had to
> >happen.  It's a tragic loss.
> >
> >A turbocharger, or centrifugal compressor would not present such a
> >restriction.  I have done quite a bit of ground testing with the turbo
> >installed as part of the induction path.  The engine runs quite well
> >with a seized or non-powered turbo.
> >
> >David Ullman wrote:
> > > An article that just appeared on the eb concerning the engine 
> in the fatal
> > > accident
> > >
> > >
> > 
> http://www.aero-news.net/index.cfm?ContentBlockID=efbfd58b-4a6f-4095-b7ff-fc
> > > 783fa77709
> > >
> > >
> > > David G. Ullman PhD ME
> > > Robust Decisions
> > > ullman at robustdecisions.com
> > > 541-754-3609
> > >
> > >
> > >
> > >
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