Rousetech 38mm reload question

[jim fustini]

I am loading a I-161W into a Rousetech 38mm x 360 case.
I have loaded 29mm Rousetech motors many times.
I put the delay grain , fiber washers,O- rings,forward closure in place, all good.
Then the 3 grains.. when i try to put the fiber washer in the aft end it does not set flat against the grain. There is like a 1/8" gap I am afraid to put the nozzel and O-ring in and tighten down the aft closure ring. It is like the fiber washer is a little big on OD. It won't fit inside the liner (about a 1/8" longer than the grains.) Should I trim the liner flush to the grains?

Help please

 

[bguffer]

According to the instructions, i would say that is normal, and no trimming should be done.
https://www.aerotech-rocketry.com/c...MS_Instructions/38mm/38_120-360w_in_20060.pdf

Notes from Step 2-9: It is normal if the grains rattle slightly inside the liner after tightening.

I know i've assembled a couple reloads similar to what you describe, somewhere between 1/16 and 1/8" gap. The grains rattled, when i shook the assembled motor. I expect the gap you describe, is what allows the rattling to take place. Reloads performed as expected.
Bob

 

[jim fustini]

Thanks, That is what it is doing. It never done that in the 29mm cases. I use CTI and LOKI for my larger rockets. This is my first time loading a Rousetec 38mm ( with Aerotech reload). did'nt know if this was normal.

 

[Rocketjunkie]

Thanks, That is what it is doing. It never done that in the 29mm cases. I use CTI and LOKI for my larger rockets. This is my first time loading a Rousetec 38mm ( with Aerotech reload). did'nt know if this was normal.

The fiber washer sits on the end of the liner, not inside it against the grains.

 

[cjl]

As Rocketjunkie said, the washer sits against the liner, and grain rattling is normal. I'm surprised you haven't seen it with 29mm - I've definitely had 29mm AT loads that rattled. Don't worry about it at all. It should be fine.