Search found 10940 matches
- Fri Jan 05, 2024 11:50 pm
- Forum: Tools and Construction
- Topic: Odds and ends
- Replies: 1850
- Views: 825676
Re: Odds and ends
The typical Trevelyan Rocker has perpendicular contact between the two parts, I think so not too much of the heat from the above rocker doesn't destroy or dampen the heat gradient. One physics lab says they keep the lead base in the freezer which is said to make it work better. If too much heat is p...
- Fri Jan 05, 2024 3:47 am
- Forum: Tools and Construction
- Topic: Odds and ends
- Replies: 1850
- Views: 825676
Re: Odds and ends
Tidbits Melde's Experiment with the Trevelyan Rocker "The usual explanation of the phenomenon is that the lead is heated as the iron strikes it, and throwing up little elevations, first at one and then at the other corner of the bolt, under thermic expansion, keeps the bolt in oscillation." https://...
- Thu Jan 04, 2024 7:49 pm
- Forum: Tools and Construction
- Topic: Odds and ends
- Replies: 1850
- Views: 825676
Re: Odds and ends
Hi Mark, Happy '24! That paper was a good read. I think it suggests this works in a vacuum, correct? So, not a convection effect, but purely conductive, which makes some sense, where the heat bleeds out at the contact, which slightly contracts that side, which makes a teensy upward bow, that makes ...
- Thu Jan 04, 2024 7:28 pm
- Forum: Off topic forum
- Topic: youtube
- Replies: 1512
- Views: 548314
Re: youtube
This bell rings two notes at the same time
https://www.youtube.com/watch?v=FV4vhxCUsEY
https://www.youtube.com/watch?v=FV4vhxCUsEY
- Thu Jan 04, 2024 4:23 pm
- Forum: Tools and Construction
- Topic: Odds and ends
- Replies: 1850
- Views: 825676
Re: Odds and ends
I was interested in these speaker spikes for some experiments. If you watch from just before the 3 minute mark up to around the 7 minute mark it had some food for thought on coupling and filter effects, maybe of interest. Why You Want to Decouple Instead of Using Spikes for Vibration Control - AV Ro...
- Thu Jan 04, 2024 4:06 pm
- Forum: Off topic forum
- Topic: youtube
- Replies: 1512
- Views: 548314
Re: youtube
Some various modifications and food for thought
Sucking down on this cone makes it rise, and Feynman sprinkler
https://www.youtube.com/watch?v=ued2cEcfAio
Levitating pipe mystery solved
https://www.youtube.com/watch?v=z3scTRJCm7w
Sucking down on this cone makes it rise, and Feynman sprinkler
https://www.youtube.com/watch?v=ued2cEcfAio
Levitating pipe mystery solved
https://www.youtube.com/watch?v=z3scTRJCm7w
- Thu Dec 28, 2023 11:52 pm
- Forum: Off topic forum
- Topic: youtube
- Replies: 1512
- Views: 548314
- Sun Dec 17, 2023 4:06 pm
- Forum: Tools and Construction
- Topic: Odds and ends
- Replies: 1850
- Views: 825676
Re: Odds and ends
This little heat engine was cobbled together with simple parts and has an odd characteristic for creating motion. Finally something that runs well and not so fragile or fussy. Flame Driven Pendulum Rocker https://www.youtube.com/watch?v=eriiZBtj5SI PHILOSOPHICAL TRANSACTIONS "On the Vibrations and T...
- Sat Nov 18, 2023 4:42 pm
- Forum: Valveless pulsejet forum
- Topic: More free plans: 40 pound Chinese
- Replies: 192
- Views: 824025
Re: More free plans: 40 pound Chinese
Over here in communist frenchystan, if they sell it to you as propane, it's 100% propane (I checked the MSDS for my supplier, nothing special, this is supermarket forecourt stuff). There are small bottles of propane / butane mix sold for eg blowtorches, but they are marked as such. If you're runnin...
- Sat Nov 04, 2023 8:13 pm
- Forum: Off topic forum
- Topic: youtube
- Replies: 1512
- Views: 548314
Re: youtube
Hydraulic microphone
https://www.youtube.com/watch?v=gXAg1SHdPxE
https://www.youtube.com/watch?v=gXAg1SHdPxE
- Sat Oct 21, 2023 2:48 pm
- Forum: Valveless pulsejet forum
- Topic: Reynst pot thrust
- Replies: 6
- Views: 1062
Re: Reynst pot thrust
Another thing that might be fun is if you could make a jam jar jet that could power a toy hovercraft. That is, have the craft jump up and down from the push of the exhaust while also taking in fresh air from around the skirt before the cycling stops. Here's something different than that but if someh...
- Thu Oct 19, 2023 8:55 pm
- Forum: Valveless pulsejet forum
- Topic: Reynst pot thrust
- Replies: 6
- Views: 1062
Re: Reynst pot thrust
360 grams is really good, I'm thinking. My approach was making a pulsepot helicopterish thing, but I could not get it to sustain: https://www.youtube.com/watch?v=mXgAOvkrOF4 That propellor attempt made me wonder if two ultralight mini thin metal jam jar jets on the tips of a propellor could lift of...
- Tue Oct 17, 2023 7:56 pm
- Forum: Valveless pulsejet forum
- Topic: Reynst pot thrust
- Replies: 6
- Views: 1062
Re: Reynst pot thrust
I toyed with that vertical takeoff thought too but didn't really have enough patience to keep trying. Some u-bend snorkels were tried to redirect the thrust downward and also thought given to somehow having the hole/exhaust face downward and feed the jam jar jet fuel differently. I like snorkels bec...
- Mon Oct 09, 2023 3:46 pm
- Forum: Valveless pulsejet forum
- Topic: Mike's Build Log
- Replies: 441
- Views: 330315
Re: Mike's Build Log
Mike that's a lot of research and "time" you've put into the project. Interesting history and methodologies. The magnetic induction brought to mind a viscous fluid resistance effect.
- Mon Oct 09, 2023 3:38 pm
- Forum: Off topic forum
- Topic: youtube
- Replies: 1512
- Views: 548314
Re: youtube
A meager display of a vibration induced spin I experienced. Stirling Hot Air Jumper with Odd Vibration Induced Spin Effect https://www.youtube.com/watch?v=AnM-8ql_HKM Related topics Cymatic Magnet Experiment ~ Frequency Induced Spin https://www.youtube.com/watch?v=RdRDEhaLFSI Vibration Induced Rotat...