Trying a different Pop Pop boiler - Fast Converting a 12V Air Compressor into a Vacuum 1 day ago   15:30

Trying a different Pop Pop boiler Fast but no Pop!
Forest Trenaman's video that inspire this particular boiler construction

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Main Components
Aluminium tube
Aluminium drinks can
Candle or tea light
Two part epoxy resin
Plastic bottle

Pop Pop boats playlist
RC Pop Pop boats
Toy Boats playlist
Daryl Foster devotes his channel to Putt Putt boats and here is the first one on his channel also back in 2009
Daryl Foster's last pop pop boat video
Here is the link to DaveHax tutorial which I found excellent
sciencetoymaker has a full step by step tutorial series on putt putt (pop pop) boats starting in January 2009 with episode 1 here
Here is a good video on tweaking the speed of these boats
This link that explains the general annealing process without getting too technical and here is a YouTube video on the subject by George Goehl

Some history on Pop Pop boats you look at this Wikipedia link on the subject they have been around since at least 1891 when a patent was filed by a Frenchman named Thomas Piot.

Water in the boiler is turned to steam. The steam has a greater volume than the water so it pushes out of the boiler and down the tube. In the tube it cools, condenses and contracts so it is drawn back into the boiler and the process repeats. The action of the steam pushing into the tube pushes the existing water in the tube out the back and that drives the boat forwards. When the steam cools it condenses and contracts so the external pressure pushes the water back up the tube.
If your next question is "why doesn't the boat oscillate backwards and forwards due to this push-pull effect?" try blowing a candle out and then try sucking a candle out and you will see the blow is fairly directional but the suck is not.

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Comments 10 Comments

Doc Ink
that really does move out. I think I saw someone bend the "cap" in a bunch of directions to loosen/stretch up the metal and get a pop.. could have been something entirely different.. maybe making the "cap" from a different type of aluminum like a take out tray would give a pop pop. just had a crazy idea about using plastic, it doesnt get hot enough to melt so... edit..I like the jar lid idea but it will probably need more heat
Hermit Oldguy
I have some copper central-heating pipe: 12mm internal diameter opens out to 37mm sheet (minus the width of the cut).It has a wall thickness of about 1.4mm so it can be hammered/rolled thinner and bigger. And of course, it can be soldered. :)
Blade Attila
The silence one is better for the ears, the noisy for the kids. Sometimes the kid stay there in the old body. I like both of them. Nice boat Grandad! ;)
Mike Flight
LOL. Don't know why it's not popping but that one is really fast. There is a type of epoxy resin and rubber sealant you can buy that is totally heat proof. I used the epoxy type on a 2 stroke glow engine and it held great. I used he sealant for the bottom and top of a Sterling engine and that worked perfectly too. I really need to get the finger out and try building one of these pop pop boats. :D
Hermit Oldguy
I agree re: pops - I prefer quiet boats. She's a flier, alright.
Hermit Oldguy
Turn it over! (Edit; the lid with the safety button - have the button relaxed inside the boiler.]
Aloaf Ov'Bread
Snap, crackle and tick, making a pop would actually make it less efficient!
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Converting a 12V Air Compressor into a Vacuum Trying a different Pop Pop boiler - Fast 1 day ago   24:55

I built a vacuum pump by modifying a 12V air compressor. The finished pump draws a moderately strong vacuum and is definitely strong enough for vacuum filtration or molding carbon fiber parts.