dixontj93060
Well-Known Member
- Joined
- Feb 19, 2009
- Messages
- 13,083
- Reaction score
- 45
Thanks Steve. The sizing chart showed my error... I mistyped.. I should have typed a P. I seem to be equating P with Paper tubes.. but it's for Fiberglass as I understand it.
I'm not certain what type of fiberglass tubes these are. they appear to be filament wound. Is that the same as G10? I am familiar with G10 plates.. solid as heck. The fins are what I understand to be 0.132 G10 plate, no bevel. The bulkheads and centering rings are what I understand to be 0.100 G10.
Here's some detail on the darn 54mm motor tube:
It's 12 inches long, but has significant variation in wall thickness and OD depending on what section I measure. The ID is consistent.
Wall thickness:
One end has wall thicknesses variation between 0.0585" and 0.060" around the circumference, but the other end has wall thicknesses variation between 0.051" and 0.058" around the circumference.
OD:
One end is 2.274" OD, and the other end is 2.266" OD.
ID:
One end is 2.159" ID, and the other end matches well as 2.159" ID. There is little variation around the circumference for the ID.
Per the Aeropack chart you've linked, 54P = 2.278. Thus I see why my retainer slides on so easily. I plan to mount the AeroPack retainer on the thicker side of my motor mount tube. I suspect the JB Weld will have no trouble filling the 0.004" gap. The forward centering ring will have a loose slip fit and need the Rocketpoxy (Glenmar G5000 High Strength Epoxy) to fill the gap. Apparently, rocketpoxy is good stuff. I just looked to see what the hardest "hitting" 54mm motor would be for Aerotech... It's the J1999. That's about 450 lbs of thrust. I hope those 2 centering rings are up for the task should I ever load one of those hard hitters.
You should be alright on the retainer w/JB Weld. And yes, unfortunately a bit of variation on the fiberglass tubing, but seems like you are dealing with it just fine.