Brian:
So it’s a function of average gas residence time?
Given a homogeneous mix, it would seem that the propellant at the bottom of
an SRB would be no further from the nozzle then the propellant at the top
of a 9” diameter motor (of 70” grain length). If the former sees no benefit
from more that about 8%—based on testing by RRS members Garboden and
Anderson—then what is the overall length at which full theoretical
performance can be achieved?
This seems like the sort of question that propellant manufactures would
have sorted out....
Bill
On Sat, Mar 31, 2018 at 1:44 AM BrianK ABQ <cielobenazul@xxxxxxxxx> wrote:
Metallic energy contribution needs some time. Thus propellant distance.
Small (relatively) amateur motors don't have the time to burn a bunch of
metal additive. I limit mine to 5%. The Space Shuttle Solid Boosters can
effectively utilize 16% Al; my 2K ns motor can't.
