I have been modelling Rossi Like systems for several years now.  On many 
occasions I have discussed my theories on vortex and have offered a simple 
static model to others interested in playing with the system parameters.

A document is being written that explains how a positive thermal feedback 
system can have significant stable gain even though many find it difficult to 
believe since the output power is many times greater than the required 
controling input power.  There is a common misconception that the output will 
over power the input leading to self destruction of the device.  On more than 
one occasion I have argued with skeptics on vortex but could not explain how 
this feedback process works in words that they understood or believed. 

Over the years, I have generated models that use spice programs, Excel, and 
just about every type of mathematical program that I could locate and develop 
with.  All of these efforts show that my conclusions are reasonable when using 
the assumptions that I make concerning the thermal power generation behavior of 
LENR materials.  The lack of solid data associated with the release of thermal 
power by the core materials keeps me from proving that my theories are 
accurate.  However, if the required data ever becomes available I suppose that 
my models can be adjusted to take any unusual characteristics into account.  My 
major concerns are that the core has some type of lag with respect to when it 
begins to release power upon application of a constant temperature to its 
material, and that its generated power drifts over significant time frames when 
a constant temperature is applied.  Both of these issues will require 

The above problems are going to have to be resolved if they are proven to exist 
when data is released by Rossi or whomever else is forthcoming.  It would be 
ridiculous for me to hold up my work until all of that information becomes 
widely distributed, so I am going to release a simple time domain model that 
others can toy with as they desire.  This particular toy model is not based 
upon actual ECAT parameters but instead uses coefficients that are small and 
well defined so that the underlying behavior can be well understood.  I have an 
Excel like program that backs up the selection of the coefficients to make 
their values easy to calculate.  I can set the location of the important device 
negative slope at will with this program as well as carefully adjust the type 
of system that is generated.  It is trivial to obtain coefficients for either 
type 1, type 2, or type 3 designs.   One can then obtain a more thorough 
understand of how the COP is influenced by these choices.

Within the last few days I began working with a freely available modeling 
program named Xcos, which comes attached to the master program named Scilab.  I 
have used that pair on several occasions before and find it to be quite simple 
to modify models, etc. using a GUI that is easy to understand.  The flexibility 
of Xcos is amazing and one can rapidly modify his test system to use different 
types of signal sources and model parameters.  I recommend that others on 
vortex obtain a copy of these programs for general modeling.

The type 2 model I am offering appears to exhibit a COP of 7 when allowing the 
built in PWM control to operate.  It has a core thermal power generation 
function that is second order in nature and an output thermal power release 
function that contains a linear term for conduction as well as a forth order 
term related to radiation.  Again, my model is simplified and not directly 
pertaining to the ECAT, but someone can adjust the variable coefficients to 
make it fall into line.   I will be available to work with anyone that wishes 
to accept that task.  Send me a private email and I will email back my Xcos 
model.  I can also send a copy of the Excel file that offers design support if 
requested.  This is a very simple Excel file, but it can be used to rapidly 
obtain coefficients to use within the Xcos model.  Trial and error is not a 
good way to adjust the Xcos model as I found out the hard way.

If you review Rossi's patent you will see that an air gap separates the heated 
fuel chamber from the cooling surface.  This is a very important aspect of his 
design.  It allows radiation power to become the most efficient way for 
internally generated power to escape the core at elevated device temperatures.  
 The forth order function is put there to outweigh the thermal power generation 
process once operation is established at high temperatures.  By this means he 
may be able to convert a potentially unstable type 3 device into a type 2 
device that does not latch up or meltdown.  Other replicaters might want to 
follow his lead.


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