Casting tube (part of the grain) or the motor liner (insulates the motor case from the burning grains)? I think the casting tubes mostly burn away but the motor liner mostly doesn't.
Is that the liner?View attachment 391292 Used 38 and 75mm AT grains.
That is the Pro38-1Grain motor with classic propellant. The white paper looking tube on the grain may burn away totally or not, should not matter either way. The black plastic looking liner should be deformed and melted looking with a few small burn-through points but should not be generally burned away. When the motor is recovered after flight, you simply unscrew the aft ring from the case and it should pull out the liner with it.Fuel is APCP and grain is 127G46-11A
Correct. And the paper tube it is bonded to is called a casting tube. The grain along with things like the delay and nozzle come pre-inserted into the motor liner. The grain can burn away completely or not at all and it should not impact the performance of the motor. The liner should not burn away but may be warped, distorted or have some small burn-through points.Thats the grain
Correct. And the paper tube it is bonded to is called a casting tube. The grain along with things like the delay and nozzle come pre-inserted into the motor liner. The grain can burn away completely or not at all and it should not impact the performance of the motor. The liner should not burn away but may be warped, distorted or have some small burn-through points.
The instructions should be fairly easy to understand and follow.
https://www.pro38.com/pdfs/Pro38Instns.pdf
It details how to adjust the delay, insert the reload (nozzle, delay, grain and liner) into the case and screw it closed. You then install the motor in the rocket and fly it. When it is recovered, unscrew the reload and throw it away. Keep the case and clean the threads to prepare for the next use.
I will not be using the given casing but will be making my own plastic casing then putting the motor inside it. I want to know if the cardboard liner will melt and burn the plastic.
Any reason why?
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