Interesting topic (esp about the mandrel fully covered in glue as this is something I have avoided when rolling tubes), there seems to be a few ways to skin the cat so to speak.
I assume that most of you have seen the tube rolling machines shown on youtubevid 1vid2
Now I would like to make a smaller version of one of those (maybe a little less automated).
Or for somethigs , in some moments industrial made tubes , bought i mean, could be better ?
I find that home made hand rolled tubes are far stronger that most commercial tubes by a long way (based on wall thickness).
I know I nagging to death the glue issue but someone also suggested I thin out the glue by adding 25% water
25% water sounds like a good place to start, after you have rolled a fair few tubes you will find a glue viscosity that gives you good results and is easy to use.
I've just seen some people on youtube that are making rocket casing by just gluing the outside flap, I'm assuming the casing strength at that point would come from the papers tensile strength and the friction between the layer. Couldn’t we do the same with these tubes IE roll them dry and glue the final wrap?
As mentioned earlier in this thread this can cause you to have a passfire flap. This would not be a problem in a pressed rocket application. You will also find that fully glued tubes are far stronger than this method.
Edited by digger, 15 July 2008 - 09:22 AM.
Phew that was close.