Oh Gawd....numbers and symbols in formula's.....my brain just froze.  Heck, if I could do calculations, I would have become an engineer.....not an attorney/cop.  Hmmmm, seems I can do percentage of award/fee stuff though <g>. 

All the best, 

Chris 

Cpl. Christopher Barber, JD 

Badge 330 

Bellaire Police Department 

5110 Jessamine 

Bellaire, Texas 77401 

713-668-0487 

713-662-8289 fax 

CBarber@BellairePolice.com 

  _____  
 

From: Rotary motors in aircraft on behalf of Ed Anderson
Sent: Tue 8/18/2009 2:22 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: Swirl pots/box fans

 

Here is a formula for a centrifugal pump that clearly? Shows that Tracy and Lynn are correct 

Energy Usage 

The energy usage in a pumping installation is determined by the flow required, the height lifted and the length and characteristics of the pipeline. The power required to drive a pump (P_{i), is defined simply using SI units by: by:} 

_{P_i= \cfrac{\rho\ g\ H\ Q}{\eta}}  

_where: 

_{Pi is the input power required (W)}  

_{ñ is the fluid density (kg/m³⁾}  

_{g is the gravitational constant (9.81 m/s²⁾}  

_{H is the energy Head added to the flow (m)}  

_{Q is the flow rate (m^3/s)}  

_{ç is the efficiency of the pump plant as a decimal}  

_{One can see that if Q the flow rate becomes zero (by blocking the exit) then the power required to drive the pump Pi also becomes zero.  So block the pump and lower the flow and the power required drops – or with the same power, the pump can spin faster.  There is always some flow around the vanes of a centrifugal pump in reality, so the power does not cause the pump to spin to infinity rpm but it equalizes at a higher rpm than when considerable (unblocked) flow is the condition.} 

_{Is this fun or what?} 

_{Ed Anderson} 

_{Rv-6A N494BW Rotary Powered} 

_{Matthews, NC} 

_{eanderson@carolina.rr.com} 

_{http://www.andersonee.com} 

_{http://www.dmack.net/mazda/index.html} 

_{http://www.flyrotary.com/} 

_{http://members.cox.net/rogersda/rotary/configs.htm#N494BW} 

_{http://www.rotaryaviation.com/Rotorhead%20Truth.htm} 

  _{_____}  
 

_{From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Lynn Hanover
Sent: Tuesday, August 18, 2009 2:55 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Swirl pots/box fans} 

<sub>NO!  I meant exactly what I wrote.  It is admittedly counter-intuitive but true none the less.  Did you attempt to prove it to yourself with the suggested test?   Only takes a few seconds :>)

Tracy</sub> 

_{On Tue, Aug 18, 2009 at 11:57 AM, Jeff Luckey <JLuckey@pacbell.net> wrote:} 

_Tracy, 

_{When a box fan falls over onto its suction side, it revs up as the work it is performing drops off to near zero.....................same idea.} 

_{Lynn E. Hanover} 

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