The Thrifty Rocketeer weblog continues….
Normally, this blog tries to provide you with some useful, constructive ideas.But in the present day, we’ll take a look at a couple of issues Not to attempt.
Just tonight, I used to be chatting with some rocketry buddies by Zoom, and one of the more senior guys holds up a couple of items destined for his excessive power rocket. He’s asking for woven elastic band assist and advice on the right way to proceed.
He’s got a medium sized carabiner in his right hand, and in his left is a strip of what he is calling an elastic band. (It appears to be like more like the headband that Spock wears in Star Trek IV: The Voyage Home, however irrespective of.)
It’s a protracted length or skein of two inch large elastic band that appears like it’d both go in a truss, a bra, or some type of back brace.
And he is asking, “How do I attach this to that?”
The dialogue starts and rules out sewing (cause the stitches won’t stretch), rivets (trigger they’ll pop whenever it stretches), grommets (for a similar purpose) and glue, (as it will not “give” without cracking).
One rocketeer said, “Dump it, simply get a nylon rope or related woven tube, and tie it on”, simply as you’d in mountain climbing.
We all just about agreed that the 2 inch width of the elastic band will not enable for a tight knot to be tied around the carabiner, so we settle on the nylon tube/rope idea.
Now this began me pondering about the time that I thought-about making my own shock cord out of elastic. When you have any kind of issues about where by along with how you can work with knitted elastic band, you are able to e-mail us at the web-page. I used to be doing a scratch construct for a recycling display on how you would flip unusual trash right into a very simple rocket and nosecone with plastic Wal-Mart bag parachute. For a shock cord, I had settled upon an outdated pair of men’s tighty-whitey briefs.
I convinced my spouse to lend me her pinking sheers, and that i used a seam ripper to free the elastic band from the pair of shorts. Very quickly, I bored with the seam ripper, and went for a straight sharp pair of fabric sheers, and just reduce as near the waist band as I might.
Now that I had the loop of elastic free, I don’t recall if I minimize throughout the appear or ripped it free, but I wound up with a single size of 1 inch huge elastic that nonetheless had a whole lot of stretch in it.
Deciding that the band was too large, I took the fabric sheers and reduce down the middle of the band leaving an equal width of elastic band on either facet of the lower. What I hadn’t counted upon was the fraying, which began instantly. The 2 elastic strips, whereas about forty two inches long, curled and buckled, refusing to put flat.
This was symptomatic of how the elastic band would behave no matter how I cut it , stretched it, or steam pressed it. I discovered that you just Can’t lower an elastic band lengthwise had have it work. (Now, for the purposes of my poster board display of the parts of a rocket, it worked well enough, however for truly use in a rocket, my thought would not have worked.)
What WOULD work is the purchase of about three feet of slim 1/8-1/four inch elastic from Joann Fabrics or comparable shop. Apart from the run on this material to make masks in the course of the pandemic, this is able to work for smaller, low-power rockets if you happen to wanted to substitute a shock cord.