This triggers memories.
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I grew up in suburban Minneapolis in the 1960s, in a suburb consisting almost entirely of homes constructed soon after WWII for new families. On the block where we lived, there were 16 houses, 12 of which had children born between 1945 and 1955, and almost all of the Dads had been military. It seemed as if one of the expectations for the men in the neighborhood was to teach the children how to detonate fireworks safely. Never mind that fireworks were illegal. Before the Fourth, there were usually at least three or four houses that would make trips to South Dakota to get fireworks. And as soon as kids starting setting off fireworks, the Dads would come out to check on what was going on.
We were taught safety, and we were taught maximum dramatic effect. During that era, building models of airplanes and cars was a big deal. As was exploding said models with firecrackers in the lead-up to the Fourth.
The houses in the neighborhood were all two-story, and one afternoon some of my friends and I decided to blow up a model airplane mid-air by putting a firecracker in it, lighting the fuse, and dropping it from an upstairs window. On our first attempt the plane plummeted to the ground before the firecracker detonated, which completely obliterated the effect we were looking for. So before blowing up a second plane we decided that we need to work out the drop before doing our next live run. To slow the drop, we tried tying the ends of handkerchief to a second model plane to act as a parachute. But when we did that, the handkerchief collapsed, and the plane plummeted to the ground again.
Then a helpful Dad gave us some pointers for making sure the lines attaching the handkerchief to the model plane were the right length and were spaced properly. He also pointed out that we needed to cut a vent hole in the center of the handkerchief to allow a controlled exit of air trapped inside the parachute to keep the 'chute from collapsing. But not too large and not too small. If the opening was too small or too large, the parachute would be ineffective. After some tries incorporating his ideas, we realized that we should start with a small opening, then incrementally increase the opening until we reached the right size. That was after cutting one that was too large, and realizing that we had to throw that one out and start over because once the opening was made, we could always make it larger but we couldn't make it smaller. After three or four tries incorporating his suggestions, we were able to get the drop to proceed nicely.
We stuck a 2-inch Black-Cat in the cockpit and dropped the plane from my sister's upstairs bedroom window. About five feet off the ground we were rewarded with an exquisite mid-air explosion.
Such a great memory. We learned a combination of problem-solving skills, combined with some hands-on physics lessons of the types that we seldom got in school.
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A related story - there was a crotchety old man in the neighborhood who made it clear that he didn't like the children in the neighborhood. He complained frequently to our parents about the noise we made while playing, he never had anything nice to say to us when he was outside and we were nearby - the only thing he ever said was to be sure to stay out of his yard and be quiet.
When he heard fireworks going off in the neighborhood, he would call the police and they would do a fireworks patrol in the neighborhood. So we punked him. All of us had
cap guns, and we learned that if we put a roll of caps (see below for an image of a roll of caps) on a concrete block or brick, and struck the roll with a hammer the effect was similar to setting off a small firecracker.
So we would get about 50 rolls of caps. They cost about $0.10 for a box of 25 rolls. We would start out near the crotchety guys house, hammering caps and knowing he would call the police. We knew all of the shortcuts through side yards and between fences and hedges so we could easily move from street within about a four-block radius.
So we would position a couple of guys as lookouts, and they would signal when the police appeared. Then we would use the shortcuts to head to a different area and start hammering. So the police would head to that area, and we would decamp elsewhere. Our goal was to see how long we could keep the police in play before they gave up. And the beauty was that if they caught up to us (which they never did), there wasn't anything we had done wrong since cap rolls were not banned.
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Postscript - the crotchety guy died and left his wife as a widow. After he was gone, she started interacting with us, inviting us in for cookies and cocoa (winter) and lemonade in the summer. She loved having us around. We started reciprocating by being sure that when there was snow, we took care of her driveway and sidewalk (which we never did when her husband was alive unless he paid us - and we charged him more because he would grumble and complain about having to pay us). She would invite us in for cookies and cocoa, and we considered that a fair quid pro quo. And in the summers she hired some of us to mow her lawn and occasionally take care of some other chores.
As I got older and reflected on this, I've used this a lesson to realize that often things in life are more complex and nuanced than they might appear to be, and that it's important to understand deeply before arriving at conclusions.