[NRVR-Members] L3 Build Techniques

[Bob Schoner]

I am not a fan of using threaded rods through centering rings. Unnecessary
extra weight and questionable added value. I have never seen a rocket fail
in a way that threaded rods would have helped. Proper surface prep with 40
grit sand paper, good epoxy (not 5 minute hobby store stuff) is more than
enough. If you want more centering ring security at the top glue a 3"
section of coupler and fiberglass it to the recovery centering ring.

If the right materials and techniques are used I don't feel TR adds
anything but extra weight. That is just one opinion. Let's hear some more.

Bob

Congrats on your Black Friday score!
On Sat, Nov 26, 2016 at 1:14 AM Thomas Tweeks Weeks <tom at theweeks.org>
wrote:

> Hey all..
>
>
>
> So I'm finally going L3... (partially thanks to Black Friday). I'll leave
> what I'm building a surprise.. All I'll say it that I chose a 75mmt kit
> that will let me cert L3, but also adapt down to 54mm and fly this bird at
> our monthly launches too.
>
>
>
> That aside, I did want to get some of your (current L3s) suggestions and
> lessons learned from your L3 builds (and other large project).
>
>
>
> There's one interesting TRA guy I've been following on Fbook who's got
> some pretty cool fincan construction and build ideas.. thought some of you
> might want to check them out and comment. I'm all ears on your big
> suggestions and lessons learned. Check it out:
>
>
> http://www.rocketryforum.com/showthread.php?131007-Level-3-Build-Rocketry-Warehouse-Terminator/page2&s=6803a5849819c8603a81a48356c32a73
>
>
>
> He uses an interesting three thread-stock rods to pass the recovery forces
> down through the forward centring ring down to the lower CR too (or thrust
> plate if you have one). Pretty cool.
>
>
>
> But if you look at his pictures, he also perforates his forward CR a total
> of five times.. something that makes me nervous. Especially all the force
> on just one side of the MMT's CR. Seems more risky.
>
>
>
> I was actually thinking about doing something similar but using a two
> super long thread-stock rods and U-bending them form U bolts (four rods)
> that run the length of the entire MMT.
>
>
>
> See crude diagram:
>
> http://theweeks.org/rockets/PICS/L3-MMT-rods.png
>
>
>
> Thoughts? Ideas?
>
>
>
> Tweeks
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