843SouthernPride
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What is the difference?
Very few long-burn composite motors are end-burning (I can only think of the Aerotech Warp9-based motors like the I49, G69, I59)
Most APCP (ammonium perchlorate composite propellant) rocket motors are central-burning rather than
endburning:
Because most APCP has a burn rate that is too low for useful endburners.
And Warp9 is the polar opposite of a long burn motor.
Larger commercial moonburners are usually made in multiple grains for shipment and have to be glued back together and yes, aligning the cores is kind of a pain, especially if the grains are tight in the liner (I'm looking at you, AT M685). Smaller ones like the AT K185 and CTI K300 are shipped as single large grains. I don't know how much more complex casting monolithic grains is.I cou see it be a problem aligning all the cores
And Warp9 is the polar opposite of a long burn motor.
Should read "And Warp9 is the polar opposite of a long burn propelant" which would allow it to work for an end-burning configuration like a 8 second I49.
I've been want to cast a gpu moonburners, my question is are they a single grain, or multiple Bates grains. I cou see it be a problem aligning all the cores
I cou see it be a problem aligning all the cores[/QUOTE said:Actually Cesaroni 75 & 98 mm moonburners are not hard to get lined up at all. As indicated in the motor assembly instructions (not quoted). A piece of pipe longer than the stacked grains, such as a copper water pipe or cpvc water pipe that will fit in the core is used to line up the offset core when gluing the grains together in the liner, once all the grains are together the pipe is pulled out leaving a perfectly aligned core. Very simple really. I believe that some of the moonburners even come with the alignment pipe included.
Greg
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