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Message-ID: <476B127F.8010402@nc.rr.com>
Date: Thu, 20 Dec 2007 20:10:23 -0500
From: Ernest Christley <echristley@nc.rr.com>
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To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Re: superchargers electric
References: <list-2607595@logan.com>
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Ernest Christley wrote:
> Ed Anderson wrote:
>>
>> That old saying "..If it looks too good to be true ......"  is hard 
>> to fault.
> Well, here's my attempt at collecting some real data.  An electric 
> leaf blower...used.  The tip is constricted to three 3/4" holes that 
> are advertised to produce 95MPH air.  I've measured it at closer to 
> 80MPH, which I find more believeable.  The fan is 5" diameter, and has 
> a removable shroud that exposes more of it so that it can be used as a 
> leaf vacuum/mulcher.  It's rated at 12A/120V and has two setting.
>
> I stuck a 3/8" tube down one hole, fed the pressurized air into a 
> bottle of colored water, which was pushed up a 1/4" tube.  The tubes 
> were held into the bottle cap with a squirt of hot glue.    I tested 
> it full open, and then closed off each of the holes in succession.  
> The last measurement was a full static test.  I then removed the 
> shroud and tested again.
>
>                       Low setting(in H2O)             High setting(in 
> H2O)
> Full open           12.75                                          19
> 1 closed             14.25                                          20.75
> 2 closed             15.375                                        22.25
> Full static          15.75                                          23
>
>
> No shroud
> Full open           8.5                                              
> 12.75
> 1 closed             8.75                                            
> 13.25
> 2 closed             9.25                                            13.5
> Full static          9.25                                            
> 13.75

Forgot to add.  Temperature was 58F.  Barometer sat at 30.13.  Humidity 
was 65%.