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Hahahahahahahahahaha.
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 2:49 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: Swirl pots/box fans
Ah, but, Chris, don't you recall that Confucius says "..Knowledge shall set
you free.. but, it won't necessarily help you cool any better"
Besides, it's the only way we engineers have of getting back at lawyers {:>)
Ed
Ed Anderson
Rv-6A N494BW Rotary Powered
Matthews, NC
eanderson@carolina.rr.com
http://www.andersonee.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
-----Original Message-----
From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On
Behalf Of Chris Barber
Sent: Tuesday, August 18, 2009 3:34 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: Swirl pots/box fans
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 (Pi), is defined simply using
SI units by: by:
P_i= \cfrac{\rho\ g\ H\ Q}{\eta}
<https://remotemail.ever-tek.com/Exchange/cbarber/Drafts/RE:%20[FlyRotary]%2
0Re:%20Swirl%20pots_xF8FF_box%20fans.EML/1_multipart/image001.gif>
where:
Pi is the input power required (W)
? 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 (m3/s)
? 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.andersonee.com/> <http://www.andersonee.com/>
http://www.dmack.net/mazda/index.html
<http://www.dmack.net/mazda/index.html>
http://www.flyrotary.com/
http://members.cox.net/rogersda/rotary/configs.htm#N494BW
<http://members.cox.net/rogersda/rotary/configs.htm>
http://www.rotaryaviation.com/Rotorhead%20Truth.htm
<http://www.dmack.net/mazda/index.html>
________________________________
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
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
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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