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Subject: Re: [FlyRotary] Re: Blower design
References: <list-4995375@logan.com>
From: Tracy <rwstracy@gmail.com>
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Date: Thu, 26 May 2011 14:23:15 -0400
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
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Except that turbocharger compressors run at over 50,000 rpm.  Easy answers a=
re 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 moto=
r to a large existing turbocharger in place of the exhaust system.  10-15,00=
0 rpm is no problem.  I have a friend in the electric business that is worki=
ng on just that concept for his Lancair - only problem is, he's overloaded a=
t work.
>=20
> RRR
>> Charlie England wrote
>=20
>=20
> On 5/26/2011 8:39 AM, Ernest Christley wrote:
>> Charlie England wrote:
>>=20
>>> Not to rain too much on the parade of ideas, but I'd be fearful that any=
thing except a properly engineered blower assembly will consume more power t=
han 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 p=
ast the perimeter of the blades, due to the ratio of the gap area to the ove=
rall area of the turbine.
>>>=20
>>> Charlie
>>=20
>> That is the biggest hurdle to overcome.  To overcome the problem the shro=
ud must fit VERY tightly.  It's a much more complicated manufacturing proces=
s, but a significant percentage of the blowers you will find have the top-ha=
t on the impeller blades.  Effectively, they have a cast in shroud with 0 cl=
earance.  That was the concept I was trying to tag onto with the "thick cyli=
nder with drilled holes" concept drawing.
>>=20
>> --=20
>> Homepage:  http://www.flyrotary.com/
>> Archive and UnSub:   http://mail.lancaironline.net:81/lists/flyrotary/Lis=
t.html
>>=20
>=20
> --
> Homepage:  http://www.flyrotary.com/
> Archive and UnSub:   http://mail.lancaironline.net:81/lists/flyrotary/List=
.html