I'm glad it worked for your project! That was the intent, to provide design
criteria for a non-erosive burn, and max recommended erosivity, and thus also
for something in-between. Looks like you dialed in just the amount of
erosivity you wanted.
Charles E. (Chuck) Rogers
CRogers168@xxxxxxx
-----Original Message-----
From: Team Icarus SDSU <rocketteamicarus@xxxxxxxxx>
To: arocket <arocket@xxxxxxxxxxxxx>
Sent: Wed, Apr 12, 2017 4:04 pm
Subject: [AR] Re: Erosive burning rule of thumb?
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
