HeliHub,
You're right on the Explorer production total. My initial 133 count was for S/Ns 900-00008 through 140 (S/Ns 001 & 002 being prototypes, and S/N numbers 003 through 007 never being allocated). However on review S/N numbers 009 and 047-051 were also never being allocated, and S/Ns 8, 95, 110 and 117 were retained as company demonstrators, with 138 also currently remaining at Mesa.
Re: the 429, I was simply highlighting the difference in production rates between the two types, nothing more.
I/C