Search found 10784 matches

by Mark
Thu Dec 05, 2019 2:51 pm
Forum: Tools and Construction
Topic: Odds and ends
Replies: 1742
Views: 338162

Re: Odds and ends

I ordered a decibel meter just to see what kind of sound is being produced with jam jars and such. Inquiring about them, a few comments came in. "If you've a half decent smartphone, look for any number of free apps which use your phone's hardware to act as a decibel meter. Some of them seem to work ...
by Mark
Wed Dec 04, 2019 4:57 pm
Forum: Tools and Construction
Topic: Odds and ends
Replies: 1742
Views: 338162

Re: Odds and ends

One thing that came to mind is that the ability to sleeve the snorkel to any depth in the neck is very useful, instead of just toying with length and diameter from a fixed point at the top of the bottle. Perhaps by lowering the snorkel deep into the bottle neck, the flame entering into bottle doesn'...
by Mark
Wed Dec 04, 2019 12:10 am
Forum: Tools and Construction
Topic: Odds and ends
Replies: 1742
Views: 338162

Re: Odds and ends

Another bottle but this time I have a scale to measure the thrust. It's about what I expected around 4 ounces yet by no means optimized I don't think. The sound is louder than it appears on youtube. The 2 ml silicone jar gasket is an ideal fit yet it also allows the exhaust tube depth to be adjusted...
by Mark
Thu Nov 28, 2019 11:07 pm
Forum: Tools and Construction
Topic: Odds and ends
Replies: 1742
Views: 338162

Re: Odds and ends

In the quest for new "Will it Jam" jars, I finally got around to getting a chemistry flask to run. It's very fussy about too much or too little fuel. Yesterday the first test with this exact same snorkel was on a 1000 ml flask, twice the volume as the one seen here. I used a gloved hand over the top...
by Mark
Tue Nov 26, 2019 1:59 am
Forum: Tools and Construction
Topic: Odds and ends
Replies: 1742
Views: 338162

Re: Odds and ends

Another shape of bottle is found to work as a jam jar jet snorkeler. It seems to run pretty steady for a time without any misfires. The snorkel is probably undersized in length and diameter and not idealized for thrust. Imagine though a short flight toy plane powered by this simple shape in aluminum...
by Mark
Mon Nov 25, 2019 3:42 pm
Forum: Tools and Construction
Topic: Odds and ends
Replies: 1742
Views: 338162

Re: Odds and ends

These are some "informal" no thought put into them shots just to show the versatility of silicon jars and silicone rubber bands used singularly or in combination in order to press-fit various tubes into bottles. And some bamboo being used as tubing just for the fun of it. One advantage of bamboo is ...
by Mark
Wed Nov 20, 2019 1:58 am
Forum: Tools and Construction
Topic: Odds and ends
Replies: 1742
Views: 338162

Re: Odds and ends

So it runs OK for a plant I guess. Maybe I'll work on it some.

Nature's Jam Jar Jet
https://www.youtube.com/watch?v=Ej-djmTnvYo
by Mark
Tue Nov 19, 2019 1:05 am
Forum: Tools and Construction
Topic: Odds and ends
Replies: 1742
Views: 338162

Re: Odds and ends

This second run did a little better in the speed department and not even the lid was too hot to keep my hand pressed against it immediately after the run! The bamboo I held for maybe a minute and the heat then started to penetrate to the outside where I thought it was going to get too hot to hold bu...
by Mark
Mon Nov 18, 2019 10:09 pm
Forum: Tools and Construction
Topic: Odds and ends
Replies: 1742
Views: 338162

Re: Odds and ends

I cut off a small amount off the top of the bamboo that previously ran for 10 seconds and it didn't run as fast as I thought it would but it did sustain longer. The bamboo was only burned in modest leopard-like spots on the inside after the run, this time the spots very near the bottom where the mea...
by Mark
Mon Nov 18, 2019 3:39 am
Forum: Tools and Construction
Topic: Odds and ends
Replies: 1742
Views: 338162

Re: Odds and ends

They are called Grifiti bands on eBay. The small 1.25 inch ones are 50 for 14 dollars and about the same price for 20 of the 2 inch ones, the measurement when you lay them flat. Make sure you read all the listings because some only offer a few for a lot. Fast delivery though and buy from this seller...
by Mark
Sun Nov 17, 2019 10:35 pm
Forum: Tools and Construction
Topic: Odds and ends
Replies: 1742
Views: 338162

Re: Odds and ends

I think this is the shape to go for if you want a shattering sounding snorkeler. A diamond in the rough.
by Mark
Sun Nov 17, 2019 10:33 pm
Forum: Tools and Construction
Topic: Odds and ends
Replies: 1742
Views: 338162

Re: Odds and ends

Here's some silicone rubber bands that allowed for so many press-fit prototype experiments like the rainbow gasket borosilicate jar that slowly sped up and then went crazy fast before blowing the lid partially off. And a crowning achievement, a gold whipped cream canister, silicone rubber band gaske...
by Mark
Sun Nov 17, 2019 4:45 pm
Forum: Tools and Construction
Topic: Odds and ends
Replies: 1742
Views: 338162

Re: Odds and ends

Another avenue to store-bought jam jar jets is to just buy some lids that fit jars you might have at home such as some spaghetti jars or canning jars that have the same size threads and cap. It helps to have a lot of things to fiddle with in that there are more possibilities and when you quickly tir...
by Mark
Thu Nov 14, 2019 3:26 am
Forum: Tools and Construction
Topic: Odds and ends
Replies: 1742
Views: 338162

Re: Odds and ends

This is an easy jar to get to run and I've another two, taller and smaller with the same size lid and diameter that I might video. The taller version ran well about a week ago when I tried it. Borosilicate is better than ordinary glass but it still makes me a little edgy. Boro sometimes even cracks ...
by Mark
Thu Nov 14, 2019 1:04 am
Forum: Tools and Construction
Topic: Odds and ends
Replies: 1742
Views: 338162

Re: Odds and ends

Out hunting for ideas today I bought some silicon straws which along with silicone rubber bands and other shapes are used for rapid prototyping. One find next to a thrift store was some large dried bamboo, 2.5 inch in diameter in an empty lot perhaps 15 feet tall so I harvested one which sounded lik...