I am interested in your model and have a question.  For some reason I did not 
locate the case where thermal run away occurred.  I suspect that I missed that 
in the large volume of material.  Could you direct me to that location?

You mention that I may be assuming a linear internal power generation process, 
but that is not what I am doing with my model.  I assume a polynomial series 
for this purpose.  Any mathematical relationship can be tested with my 
simulation and I have tested the old tried and true exponential curve as well.  
Each one has its own quirks and can lead to thermal run away when the COP get 

I am quite pleased that you are developing a model independently from me so 
that we can approach the problem from two different directions.  One day we 
should combine our attempts, but you need to continue for a while longer with 
your model.  Make an attempt to calculate the COP you are measuring and the 
thermal run away process.



-----Original Message-----
From: Alan Fletcher <>
To: newvortex <>
Cc: vortex-l <>
Sent: Wed, Jun 5, 2013 5:09 pm
Subject: [Vo]:Re: [nVo] Moletrap discussions on the "independent report" on  
Rossi's  Hot Cat

NOTE : this is being sent to vortex AND new-vortex   I hope it works!

> From: "Abd ul-Rahman Lomax" <>
> Sent: Wednesday, June 5, 2013 2:50:08 PM
> Subject: [nVo] Moletrap discussions on the "independent report" on Rossi's  
Hot Cat

> >Seriously, folks..... the one issue that keeps being glossed over
> >whenever it is brought up is just this: How do you control an
> >exothermic reaction at the core of a cylinder by using heating coils
> >further out towards the surface of the cylinder?
> >I have never yet heard a plausible explanation of how this is
> >supposed to work in Rossi's system. It is clear from the graphs in
> >the paper that the system must be supplied with power, literally
> >from outside, or it will cool right off. The data that appear to
> >show it continuing to heat up for a little while after the power is
> >reduced, in each cycle of the thermostatically-controlled power
> >cycling, simply indicate that it takes a little time for temperature
> >changes to propagate thru the device, I think, and in no way
> >indicate that the inner core is exothermic on its own. How do you
> >get any kind of "self-sustaining" behaviour from this, and
> >especially how do you use the heat coils to stop the thing from
> >"runaway heating" and meltdown, if the inner cylinder is a greater
> >source of heat than are the coils?

I have just finished an  initial thermal analysis of the Hotcat, using Spice, 
an attempt to explain its unusual "sine-like" output.

I tried various possible "waveforms" for the hotcat's excess heat, and found 
best fit to be a "sawtooth" -- starting when the heater pulse arrives, 
at its peak, and then falling rapidly.

I am working on a model to explain this behavior. 

On vortex David Roberson is exploring the control mechanism, also through a 
Spice model. He argues for a linear control model.

My short answer is that yes, Virginia ... a small  heat source  CAN control the 
large heat source.


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