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Today I
tested a RIO doped starter grain in a 38mm C-Slot. Due to a clerical
error, (otherwise known as ruler opps) I made a 101mm long grain
instead of the usual 112mm long grain. Since is was only a slight
reduction in Kn I decided to proceed with the test.
If you
recall the last C-Slot took 12 seconds to come up to pressure. I
believe the ISP suffered as a result of that fact. This test was to
prove that a short section of RIO doped fuel at the head of the grain
would improve ignition time and hopefully increase ISP.
After
reviewing the data it appears as if it helped with both problems. This
motor lit after 1.6 seconds. That is seven and one half times faster
than the last test. A marked improvement. ISP also increased from
114.94 to 126. An increase of 9.6%.
There was
1.75 seconds of thrust with a total of 150.12 Newtons. Average thrust
was 83.40 Newtons. The flame were well formed and richly colored
for 1.6 seconds of the thrust.
Although
it is a bit more work, I have decided that the RIO doped starter grain
is necessary with this fuel when using my present igniters.
38mm C-slot
static test 3-11-07
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