Except that turbocharger compressors run at over 50,000 rpm.  Easy answers are hard to come by.

Tracy

Sent from my iPad

On May 26, 2011, at 2:17 PM, Roger Robertson <rrrob3572@sbcglobal.net> wrote:

> On 5/26/2011 1:02 PM, Roger Robertson wrote:
> Probably the best solution is to hook a new  high efficiency electric motor to a large existing turbocharger in place of the exhaust system.  10-15,000 rpm is no problem.  I have a friend in the electric business that is working on just that concept for his Lancair - only problem is, he's overloaded at work.
>
> RRR
>> Charlie England wrote
>
>
> On 5/26/2011 8:39 AM, Ernest Christley wrote:
>> Charlie England wrote:
>>
>>> Not to rain too much on the parade of ideas, but I'd be fearful that anything except a properly engineered blower assembly will consume more power than it will add to the engine's output. Much better minds than mine say that one of the reasons small turbines are so inefficient is excessive leakage past the perimeter of the blades, due to the ratio of the gap area to the overall area of the turbine.
>>>
>>> Charlie
>>
>> That is the biggest hurdle to overcome.  To overcome the problem the shroud must fit VERY tightly.  It's a much more complicated manufacturing process, but a significant percentage of the blowers you will find have the top-hat on the impeller blades.  Effectively, they have a cast in shroud with 0 clearance.  That was the concept I was trying to tag onto with the "thick cylinder with drilled holes" concept drawing.
>>
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>>
>
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