Received-SPF: softfail
 receiver=logan.com; client-ip=66.94.237.216; envelope-from=echristley@nc.rr.com
Message-ID: <4DDF0EF5.90000@nc.rr.com>
Date: Thu, 26 May 2011 22:39:49 -0400
From: Ernest Christley <echristley@nc.rr.com>
Reply-To: echristley@att.net
User-Agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.2.17) Gecko/20110424 Lightning/1.0b2 Thunderbird/3.1.10
MIME-Version: 1.0
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Re: Blower design
References: <list-4995608@logan.com>
In-Reply-To: <list-4995608@logan.com>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: 7bit

4Hp is what I was expecting to spend to get a 10% increase in pressure.  
That would give me between 15 and 20Hp.

Does anyone here work on Volkswagens?  They have a fan to cool the 
engine that looks like the shape I need, but I'm clueless as to the 
dimensions.  Here is what I'm talking about:

http://www.chircoestore.com/catalog/product_info.php?cPath=109_115_124&products_id=3295&osCsid=hclq20d2slrq1qh3eec132ii90


On 05/26/2011 07:25 PM, Bill Bradburry wrote:
> It probably takes 3 or 4 HP to produce the air pressure and volume that is
> required for a turbo/super charger.  At 12 or even 24 volts that is a lot of
> continuous amps!
>
> When you want extra power, something is going to have to produce it and it
> is not going to be free!
>
> It seems to me that the most economical for a plane is a turbo.  Most of the
> power to run it is currently going to waste.  Not all the power, just most
> and maybe most at that.  But they can be problematic in a car and much more
> so in a plane.
>
> I like Mark Steitle's solution much better.  Get the power you need in a
> more simple, less complicated manner.
>
> Bill B
>
> -----Original Message-----
> From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On
> Behalf Of Tracy
> Sent: Thursday, May 26, 2011 2:23 PM
> To: Rotary motors in aircraft
> Subject: [FlyRotary] Re: Blower design
>
> 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.
>>> -- 
>>> Homepage:  http://www.flyrotary.com/
>>> Archive and UnSub:
> http://mail.lancaironline.net:81/lists/flyrotary/List.html
>> --
>> Homepage:  http://www.flyrotary.com/
>> Archive and UnSub:
> http://mail.lancaironline.net:81/lists/flyrotary/List.html
>
> --
> Homepage:  http://www.flyrotary.com/
> Archive and UnSub:
> http://mail.lancaironline.net:81/lists/flyrotary/List.html
>
>
> --
> Homepage:  http://www.flyrotary.com/
> Archive and UnSub:   http://mail.lancaironline.net:81/lists/flyrotary/List.html
>