Charles Rogers has an excellent article on his website called "Erosive
Burning Design Criteria for High Power and Experimental/Amateur Solid
Rocket Motors".
Our recent motor test used a fairly long motor geometry (4"x50") with a
variable diameter core dimensioned using the "slightly erosive" criteria in
this article. The test showed a slight erosive spike at the beginning of
the burn as predicted.
Alex Lewis
On Apr 12, 2017 1:54 PM, "William Claybaugh" <wclaybaugh2@xxxxxxxxx> wrote:
Is there any experience-based rule for erosive burning in cylinderical-type
grains (Bates, Finocyl, etc.)? I am particularly looking for experience as
to how small the core diameter can be as a percentage of grain diameter:
50% appears to assure no erosion at L/D of 10:1 or less, what about 33%?
When does overall length begin to play? I know that around 15:1 will lead
to erosion with a 50% core diameter, for example. What is the "critical"
length at 33%? What about other core diameters?
Bill
