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[DPRG] mega caps

Subject: [DPRG] mega caps
From: Rud Merriam k5rud at arrl.net
Date: Mon Jan 25 17:12:59 CST 2010

I'm wondering how you control the rate of discharge so it all doesn't hit at
once and create a turkey bomb. 

 - 73 - 
Rud Merriam K5RUD
ARES AEC Montgomery County, TX 

-----Original Message-----
From: Rick Bickle [mailto:rbickle at intconsys.com] 
Sent: Monday, January 25, 2010 4:30 PM
To: DeltaGraph at aol.com; dprglist at dprg.org
Subject: RE: [DPRG] mega caps

Did you calculate the required gauge of wire to adequately handle the

I'm guessing you will flash plate everything within a 3 foot radius.





From: dprglist-bounces at dprg.org [mailto:dprglist-bounces at dprg.org] On Behalf
Of DeltaGraph at aol.com
Sent: Monday, January 25, 2010 1:00 PM
To: dprglist at dprg.org
Subject: Re: [DPRG] mega caps


Dear Dr Evil, (or aspiring Dr Evils)


OK, so 1MF cap charged to 2.7 volts  = 3.6 million watt seconds.

I think you could probably cook a turkey with that. My initial guess would
be that the turkey could have a starting temperature of -273C (absolute
zero) and still get cooked.


Since I have extra time not being an officer of DPRG anymore, I  attempted
the calculations:

Disclaimer: You might want to check my work if you decide to carry the
experiment out with expectant dinner guests. 


Figuring latent heat of fusion to thaw the bird once it reaches 0C (334
kJ/kg) plus 4.2 kJ/kg per delta degree C. I calculate for final temp of 80C
(176F) and above stated 1MF capacitor charged to 2.7 volts:

Bird kg x (334+ (273+80) x 4.2) = 3600 kJ

Bird kg = 3.81 kg =  8.4 lbs


Not a very large turkey, but with a pre-thawed turkey at say 5C. The
calculation yields a 25lb bird can be cooked.


Maybe we can try this out at tomorrows RBNO at the generator. I will spring
for the bird if someone will bring the capacitor(s).











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