Static test of G-eX 29mm motor

EDITED! See below.
This is a video showing some of the steps in making the reload for my newest ex-motor, named G-eX, as well as the first ground test. It is a 29mm motor with stainless steel nozzle (actually the same one as used on my smaller F-eX motor). Total fuel weight is approx. 80 grams. This first test was to show if the case would stand the pressure and it did without any problems.
In fact, the case was cooler after firing than the F-case is, as this motor uses thicker liner/s.

And no (again, I might add), I will not share my fuel mixtures here on youtube. There are several good and serious EX-forums on internet. Join one of those insead of asking here.

Edit: I got the numbers wrong in the video. Due to a mismatch of calculated and measured burn time I mixed up the rest of the calculations. I will not change the video though, just be aware that the stated numbers in the video are off.
Here you got what must be closer to the truth:

G145, burn time (calculated) is 0,63 seconds (where the real deal is 0,83 or so), max Kn is 198, initial thrust 141 N and max 155 N, max pressure is 449 psi or 31 bar and Isp is 123.

Category:

Science & Technology

Tags:

• aviation
• space
• knsu
• G-eX
• static
• test
• rocket
• motor
• g-class
• nozzle
• case
• rocketry
• experimental
• sweden
• ufo
• ifo
• model

[DeceitfulFrank]

That's a very low Kn for a candy motor and even with a good steel nozzle, you Isp is ambitious to say the least! Calculated burn time seems about right. My 27mm grains go for about 0.7 seconds max fired from a small bulb of KClO3 and icing sugar right up inside the motor at the top of the grain, Though I prefer totally uninhibited grains.

Good effort, 4*