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From: "Michael McMahon" <afm528@gmail.com>
To: "'Rotary motors in aircraft'" <flyrotary@lancaironline.net>
References: <list-4989948@logan.com>
In-Reply-To: <list-4989948@logan.com>
Subject: RE: [FlyRotary] Re: Blower experiment:  FAIL
Date: Fri, 20 May 2011 15:27:59 -0700
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I'm sorry if this is a dumb question, but would this be considered a
supercharger, since it's being driven by the engine all of the time?  Are
there supercharger or turbocharger impellers that would be large enough?
And finally, would a laser-glue thingamabob (I CANNOT think of the name for
the laserjet like parts 'printers') be able to make a part to withstand the
stress?  If not on its own, could it be used to make a mold or to be coated
with something stronger?

Mike

-----Original Message-----
From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On
Behalf Of Ernest Christley
Sent: Friday, May 20, 2011 2:25 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: Blower experiment: FAIL

I doubt any amount of balancing would have kept the blower together.  
The highest RPM I hit was aroun 4000.  Most of the rivets were sheared
cleanly.  My design was simply not anywhere close to robust enough.

I've got a line on a company that will do one-off dynamic balancing in North
Carolina.  Do you think I could convince you to mill me a rotor, and then I
could get my whole assembly balanced?


H & J Johnson wrote:
> Ernest, did you get a high speed dynamic balance on your blower?  I've 
> built blowers of a similar form and had good results, but only after 
> balancing to rated RPM.
>
> Jarrett Johnson
> www.innovention-tech.com
>
>
> ----------------------------------------------------------------------
> --
>
> Some of you may recall my blower experiment.  Using the shaft between 
> the flywheel and PSRU to drive a centrifugal fan to charge the intake.
>
> My implementation died in the crib.  before.jpg shows what it looked 
> like a week ago.  after.jpg is what was left of it after the few 
> minutes I was able to get the engine to run.  Well, that wasn't all 
> that was left over.  intake.jpg shows how the blades got thrown toward 
> the intake and smashed up against the air filter.
>
> Oh, well.  Until I can design and build or have built an impeller that 
> can handle 8000RPM, I'm going to table this experiment.  I still think 
> it is a good idea.  So did these guys:
>
> http://www.flightglobal.com/pdfarchive/view/1942/1942%20-%200142.html
>
> Furthermore, the calculator at
> http://www.forestryforum.com/members/donp/Blowercalc.htm indicates 
> that with the 10.4" diameter, 3.35" deep area available for me to put 
> a blower, I should be able to generate 17" water column pressure.
>
> ----------------------------------------------------------------------
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>
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