Received-SPF: pass
 receiver=logan.com; client-ip=209.85.216.52; envelope-from=david.staten@gmail.com
DomainKey-Signature: a=rsa-sha1; c=nofws;
        d=gmail.com; s=gamma;
        h=message-id:date:from:user-agent:mime-version:to:subject:references
         :in-reply-to:content-type:content-transfer-encoding;
        b=KstBBKKwAjD4WS1Lf17boemW3hsBFAGwKoniZr/tqe2MV/lTqWHhoRZqRbThep1bhD
         T2zDodg3QBUlLPdWJG9bo4fRmjDvRE7shxtPlZzeAjOlU3NrnLyRtsBqT3TjUMxofWXD
         aBN339q4gGs28wu2PUyUDVIuKMHBuA99e2NYo=
Message-ID: <4DD7CDEE.4020000@gmail.com>
Date: Sat, 21 May 2011 09:36:30 -0500
From: Dave <david.staten@gmail.com>
User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.0; en-US; rv:1.9.2.17) Gecko/20110414 Lightning/1.0b2 Thunderbird/3.1.10
MIME-Version: 1.0
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Re: Blower experiment:  FAIL
References: <list-4990046@logan.com>
In-Reply-To: <list-4990046@logan.com>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: 7bit

Just buy a supercharger and put a blister on the cowl to make it fit. 
They make em. You will spend 1-3 times as much in the end trying to roll 
your own (over and over again) when an off the shelf solution exists.

Speaking from experience here...

If I had the right equipment, and knew how to calculate the performance 
in order to design and produce a shaft driven coaxial blower I would.. 
but I dont..

On 5/20/2011 7:43 PM, Ernest Christley wrote:
> On 05/20/2011 07:35 PM, H & J Johnson wrote:
>> So your thinking that the centrifugal forces are what sheared the 
>> rivets?  It's pretty crazy how high the forces spikes could be from 
>> an unblanced fan. I've not see one yet that was just built and 
>> installed w/out being balanced and lived for any period of time. That 
>> kind of stuff fails spectacularly, once it starts to go you couldn't 
>> stop it fast enough to stop it from exploding.
>
> Can't argue one way or the other.  All I know is that it came apart 
> completely, and I wouldn't trust another constructed that way to last 
> any longer.
>
>> As far as cnc'ing one, sure that can be arranged. Are we talking from 
>> billet or a casting or..?  Material?
> Would a cast object be able to hold together?  I was thinking that 
> with a CNC, a machined billet one-off would be the easiest route.
>
> -- 
> Homepage:  http://www.flyrotary.com/
> Archive and UnSub:   
> http://mail.lancaironline.net:81/lists/flyrotary/List.html
>