#21
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__________________
John Lance Ladd Yoyodyne Propulsion Systems Grovers Mill, NJ Established 1938 lladd.netau.net |
#22
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The current kraft paper tube with glassine finish is a thing of engineering beauty. It's light, strong and perfect for our applications. I've seen folks use lots of alternative tubes and the results are seldom anywhere near as effective as just buying the right tube. Wrapping paper cores and paper towel cores are pretty awful. Saran wrap cores are strong, but take lots and lots of filling/sanding to get a good finish, and even then, they don't seem to hold fins very well, at least not without glassing the roots. For larger rockets, I've used paper roll cores made with a lower quality kraft paper, but they turned out surprisingly weak (w.r.t zippering) and still needed lots of filling/sanding to get a good finish. Furthermore, they're heavy compared to LOC tubes for example, and pretty much need to be glassed to be trustworthy. Mailing tubes are pretty much the same - tough to finish and heavy for their strength. IOW, need to be glassed. Carpet roll cores are awful, too. Heavy and zipper prone, and still need glassing. It's like flying a steel pipe It's a good rocketeer learning exercise to do a Saran tube, a paper roll core and/or a mailing tube rocket - once or twice, but in general it's a heckuva lot more cost-effective to just buy the right tube to start with. Let's all give a toast to the folks who perfected our kraft paper rocket tubes. :cheers: Doug |
#23
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I'll second that. Sean "Heck, I might even third that" Lannan |
#24
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I'm Sorry...
But I refuse to drink something that looks like it came out the other end already...
G. |
#25
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__________________
Paul If we weren't all crazy, we would go insane - Jimmy Buffett NAR #87246 www.wooshrocketry.org |
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