<html><head><meta http-equiv="Content-Type" content="text/html charset=utf-8"><base></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="">Hello Vivian, Chip and others,<div class=""> The derivations of the radius R=lambda/2pi of my internally superluminal photon model and the corresponding 45-degree forward angle of the photon model's internal helical trajectory are given in Section 5, equations 8 through 17 in my published 1996 article “Microvita: A new approach to matter, life and health”, which I attach and which is available from Springer and at <a href="https://www.academia.edu/28777551/Microvita_A_New_Approach_to_Matter_Life_and_Health" class="">https://www.academia.edu/28777551/Microvita_A_New_Approach_to_Matter_Life_and_Health</a>. My internally-double-looping model of the electron is also presented quantitatively there in Section 6. The electron model there has evolved into my SPIE relativistic spin-1/2 charged-photon electron model since then. It follows directly from the photon model's helical angle of 45 degrees that the internal speed of the photon model is c sqrt(2), which I state explicitly in my published 2007 article “FTL quantum models of the photon and the electron”, attached below and available from STAIF-2007 and at <a href="https://www.academia.edu/4429837/FTL_Quantum_Models_of_the_Photon_and_the_Electron" class="">https://www.academia.edu/4429837/FTL_Quantum_Models_of_the_Photon_and_the_Electron</a> . </div><div class=""> Richard</div><div class=""><br class=""></div><div class=""></div></body></html>