07-22-2010, 08:09 PM
|
 |
Master Modeler
|
|
Join Date: Jan 2009
Location: Fairbanks, Alaska
Posts: 6,507
|
|
Quote:
|
Originally Posted by Shreadvector
I think there was a later (possibly Centuri blue or green casing era) version of B14 make with a deep tapered core rather than the core with two steps seen earlier. It was much deeper than the B8/C5 core.
|
I have one of those blue-casing motors (a Centuri B14-7, Date Code: 110 1 73). Its nozzle is *very* wide and is almost cylindrical in cross-section, rather like the "nozz-hole" orifices in the Quest MicroMaxx motors. The tapered propellant grain void looks conical (it may be cylindrical for the upper 20% or so, but the foreshortened view makes it difficult to tell).
I also have an Estes B14-5 (Date Code: 21J5), whose nozzle looks like a B4's nozzle (going from memory, as I don't have any B4 motors on hand). The nozzle is considerably narrower than the Centuri B14-7's nozzle; it is a straight-sided cone that narrows down to a short cylindrical section. The grain void beyond is almost cylindrical, being a gently-tapered cone.
For comparison, a Centuri B8-5 I have (Date Code: 10l8? [the bottom of the third character wasn't printed]) has a nozzle only slightly wider than that of an Estes B6-4 (Date Code: 10 A 10). The grain void is conical, with perhaps the upper 10% - 15% being cylindrical. |