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BrandX cases?

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rocketlaw

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I believe the dimensions are the same - so I am apt to say yes, but I have not tried, yet. :D

The motors I mix for my Brand X cases use the liners and packing tubes from Loki.
 

skycopp

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I can't say anything for all reloads and all equivalent cases. But I attempted once with a J175 reload and the equivalent sized BrandX and discovered that it wouldn't fit. Also as I understand it, some clubs will only allow commercial motors to be used with the corresponding case.
 

rocketlaw

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Thats wierd. At least for the 3 grain 54mm size, the grain length of each grain is the same for Brand X and Loki. So concievably, the only reason it would not fit is the length of the liner tube is different. If loki uses longer liner tubes, then it could be made to fit in a Brand X motor by cutting the liner tube.

However, doing any of this or even flying it in the case without modification would be an EX motor and need to be launched at a TRA Research Launch by a L2 flyer.
 

skycopp

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Thats wierd. At least for the 3 grain 54mm size, the grain length of each grain is the same for Brand X and Loki. So concievably, the only reason it would not fit is the length of the liner tube is different. If loki uses longer liner tubes, then it could be made to fit in a Brand X motor by cutting the liner tube.

However, doing any of this or even flying it in the case without modification would be an EX motor and need to be launched at a TRA Research Launch by a L2 flyer.
It wasn't the length, as I remember it didn't fit because the liner was way too thick. Fit perfectly in the Loki 54-1200 but not the corresponding BrandX.
 

JDcluster

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Then it comes down to AL tubing supplier. The industry tolerances aren't as tight as it needs to be for rocketry usage. The only way to ensure a proper fit would be to have a custom mill run like AMW did with their hardware & that takes $$$$$$$. Then you pretty much eat up you margins & have to charge just as much as AMW if not more for the hardware. It's EX and your not going to make a dime on the reloads for any hardware.

It's easier to sand down the liner or try another than it is to hone out you Al casing...



JD


It wasn't the length, as I remember it didn't fit because the liner was way too thick. Fit perfectly in the Loki 54-1200 but not the corresponding BrandX.
 

Binder Design

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Then it comes down to AL tubing supplier. The industry tolerances aren't as tight as it needs to be for rocketry usage. The only way to ensure a proper fit would be to have a custom mill run like AMW did with their hardware & that takes $$$$$$$. Then you pretty much eat up you margins & have to charge just as much as AMW if not more for the hardware. It's EX and your not going to make a dime on the reloads for any hardware.

It's easier to sand down the liner or try another than it is to hone out you Al casing...



JD
You hit the nail on the head. If the 54mm motor has an integral thrust ring built in, it is not even tubing, it is pipe. Tolerance on pipe is horrible from one section to another, and many times even has grooves on the ID from being run through worn out dies. If you machine the pipe down into motors, the only way to get consistency is to hand pick from the supplier. About one in three sections might be usable. If you can't hand pick, you take your chances on what they send you. I've got plenty of sticks of unusable 2" pipe. Enough so that I sourced a small amount of tubing to fill orders until I can get in on a custom run with a few other EX'ers.

That's why I hate 54mm. It is a horrible size for EX rocketry. 64mm should be the standard sized MMT so we can use standard 2.5" tubing.

Mike Fisher
Binder Design
Fisher Research Hardware
 
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