ihbarddx
Well-Known Member
ThrustCurve.org lists their impulse as 5.6 ns. Isn't that too much for a B motor? Estes lists it as 5.0 ns, which is the usual nonsense. What is it?
Some of the numbers are close but not an exact match:Something is goofy in ThrustCurve's data then. Here's the current NAR cert data for an Estes B6: https://www.nar.org/SandT/pdf/Estes/B6.pdf
It shows a tested total impulse of 4.33 N-s (which is what i use when putting my stats into the Newton Tally threads) and a certified value of 4.90 N-s (which puzzles me in that it's different). No idea how ThrustCurve could have them in as a low C.
@JohnCoker ?
5.0 N times 0.9 s doesn’t equal 5.6 N-s. It should be 4.5 N-s.Some of the numbers are close but not an exact match:
NAR Average Thrust 5.03 N
TC Average Thrust 5.0 N
NAR Burn Time 0.86 seconds
TC Burn Time 0.9 seconds
While Total Impulse isn’t close as Bernard posted:
NAR Total Impulse 4.33 N-s
TC Total Impulse 5.6 N-s
Which is more than a little off and well outside the acceptable allowed variance - puzzling!
That is probable where the 5.6 come from.NAR shows a propellant mass of 5.6 grams. Which is probably where that number came from. Just a data entry error.
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