Nothing wrong with that at all.
LOC PRECISION - TUBES, NOSE CONES, ETC - BEST PRICES ?
- Thread starter Ez2cDave
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Nothing wrong with that at all.
grouch
Well-Known Member
Nope. If I ever do one it will be exactly this type of flight profile. Low and slow gets the girls you know.
MClark
Well-Known Member
Too bad not close to Phoenix. I have in garage a half dozen 7.5 LOC nosecones and many tubes.
Ez2cDave
Well-Known Member
ALL my experiences with PML motor tube is that all the ones I have been involved with helping build have been too tight for the motor casing and we ended up laboriously sanding the inside of each
the tubes were fine before gluing into the rockets, they shrink at each glue seam
I cannot tell you how many wasted hours that was, MANY
I am a big fan of the new blue tube and will use it for any rocket that I design which so far have been 9, 2 4", 2 3", 2 2.5", 2 2", 2 1.5" and 1 1"
here are the 4 and 3"
the 4" have been up on full K to 7K feet, I have a mid L to burn when the wind is right
the tubes were fine before gluing into the rockets, they shrink at each glue seam
I cannot tell you how many wasted hours that was, MANY
I am a big fan of the new blue tube and will use it for any rocket that I design which so far have been 9, 2 4", 2 3", 2 2.5", 2 2", 2 1.5" and 1 1"
here are the 4 and 3"
the 4" have been up on full K to 7K feet, I have a mid L to burn when the wind is right
ALL my experiences with PML motor tube is that all the ones I have been involved with helping build have been too tight for the motor casing and we ended up laboriously sanding the inside of each
the tubes were fine before gluing into the rockets, they shrink at each glue seam
I cannot tell you how many wasted hours that was, MANY
I am a big fan of the new blue tube and will use it for any rocket that I design which so far have been 9, 2 4", 2 3", 2 2.5", 2 2", 2 1.5" and 1 1"
here are the 4 and 3"
the 4" have been up on full K to 7K feet, I have a mid L to burn when the wind is right
I think you must be thinking of something else. PML phenolic is waterproof and very temperature stable. I have lots of it in many rockets and have never had any issues with CTI, AT, AMW, or Loki cases. The only problem is brittleness which makes it less suitable for a body tube.
Now a kraft paper cardboard tube will get rings when used with a wood glue, but PML phenolic with epoxy never changes.
Ez2cDave
Well-Known Member
Ez2cDave
Well-Known Member
OK . . . Now, I'm confused - LOL !
Does PML phenolic remain stable or not ?
Dave F.
all the tubes we used had PML written on the inside
and they did shrink, AT 98mm motor would not fit, bound up at each centering ring and had to be sanded with a cylinder hone
we had to fabricate an extension to get past 36"
we did not have possession of the casing until the night before the launch and had to locate a cylinder hone and I would guess 3-4 hours of work to open it up
and they did shrink, AT 98mm motor would not fit, bound up at each centering ring and had to be sanded with a cylinder hone
we had to fabricate an extension to get past 36"
we did not have possession of the casing until the night before the launch and had to locate a cylinder hone and I would guess 3-4 hours of work to open it up
That certainly could be. One of the things I like best about PML is how stable their tubes are, but I didn’t start until 2000. I’ve never seen one warp in any way. How tight were the centering rings? The pyramid/triangle inside is certainly their logo (the superstitious part of me points it upward.)
I’ve definitely seen cardboard tubes with wood glue get rings and I’ve seen drips of unseen epoxy inside tubes make life very miserable.
Nytrunner
Pop lugs, not drugs
But we want it to come back DOWN safely!
KenRico
'Just the Tip'
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Most of my LOC stuff I bought from Wildman Rocketry as he stocks the components and many other items ...one stop shopping for me.
I still reach for the LOC MMTs or tubes to make my own longer mmts or Class 1 fun. I like a single wrap of fg as it is still lighter than fw fg and bluetube , but gives the tube some elasticity - if it falls over or takes a hit ..it is less likely to crimp. Also it is much easier for me to slot if wrapped .
Just starting to play with BMS tubes .. they have full length couplers and bluetube full length couplers - but they lack the bigger mmts .
Kenny
rharshberger
Well-Known Member
Unless BMS has changed their offerings basically their tubes are the equivalent of Estes, and some Aerotech sizes with a few Quest/Centuri sizes. BMS used to carry Blue Tube but I haven't seen them listed on Balsa Machinings site for a couple of years (unless Bill has his new site up and running).
In that picture it appears as though there’s a piece of phenolic coupler inserted into a piece of phenolic tubing. The construction of centering rings from Nomex honeycomb covered by glass cloth is something I have not done. It’s a great technique for managing mass. I can’t imagine why that would cause a constriction about the motor mount tube, though. I don’t know what happened, but this is the only time I have ever heard of PML motor mount tubing changing dimensions. Now, Quantum Tube is a different story. It changes enough due to temperature that fitting a piston to slide easily sometimes requires last minute sanding of a phenolic piston right before flight.
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